VOLUME 1 MEIGS COUNTY, OHIO€¦ · 1.1 The National Flood Insurance Program The National Flood...

i

VOLUME 1

MEIGS COUNTY, OHIO AND INCORPORATED AREAS COMMUNITY NAME COMMUNITY NUMBER MEIGS COUNTY UNINCORPORATED AREAS 390387

MIDDLEPORT, VILLAGE OF 390388 POMEROY, VILLAGE OF 390389 RACINE, VILLAGE OF 390390 RUTLAND, VILLAGE OF 390670 SYRACUSE, VILLAGE OF 390391

EFFECTIVE: TBD

FLOOD INSURANCE STUDY NUMBER 39105CV000B Version Number 1.1.1.0

nsoltes

Prelim

ii

TABLE OF CONTENTS

Page

SECTION 1.0 – INTRODUCTION 1 1.1 The National Flood Insurance Program 1 1.2 Purpose of this Flood Insurance Study Report 2 1.3 Jurisdictions Included in the Flood Insurance Study Project 2 1.4 Considerations for using this Flood Insurance Study Report 4

SECTION 2.0 – FLOODPLAIN MANAGEMENT APPLICATIONS 15 2.1 Floodplain Boundaries 15 2.2 Floodways 16 2.3 Base Flood Elevations 19 2.4 Non-Encroachment Zones 19 2.5 Coastal Flood Hazard Areas 19

2.5.1 Water Elevations and the Effects of Waves 19 2.5.2 Floodplain Boundaries and BFEs for Coastal Areas 19 2.5.3 Coastal High Hazard Areas 19 2.5.4 Limit of Moderate Wave Action 20

SECTION 3.0 – INSURANCE APPLICATIONS 20 3.1 National Flood Insurance Program Insurance Zones 20 3.2 Coastal Barrier Resources System 20

SECTION 4.0 – AREA STUDIED 20 4.1 Basin Description 20 4.2 Principal Flood Problems 21 4.3 Non-Levee Flood Protection Measures 22 4.4 Levees 23

SECTION 5.0 – ENGINEERING METHODS 23 5.1 Hydrologic Analyses 23 5.2 Hydraulic Analyses 26 5.3 Coastal Analyses 29

5.3.1 Total Stillwater Elevations 29 5.3.2 Waves 29 5.3.3 Coastal Erosion 29 5.3.4 Wave Hazard Analyses 29

5.4 Alluvial Fan Analyses 29

SECTION 6.0 – MAPPING METHODS 30 6.1 Vertical and Horizontal Control 30 6.2 Base Map 31 6.3 Floodplain and Floodway Delineation 32 6.4 Coastal Flood Hazard Mapping 41 6.5 FIRM Revisions 41

6.5.1 Letters of Map Amendment 41

iii

6.5.2 Letters of Map Revision Based on Fill 41 6.5.4 Letters of Map Revision 42 6.5.3 Physical Map Revisions 42 6.5.4 Contracted Restudies 42 6.5.5 Community Map History 43

SECTION 7.0 – CONTRACTED STUDIES AND COMMUNITY COORDINATION 44 7.1 Contracted Studies 44 7.2 Community Meetings 45

SECTION 8.0 – ADDITIONAL INFORMATION 47

SECTION 9.0 – BIBLIOGRAPHY AND REFERENCES 48

Figures Page

Figure 1: FIRM Panel Index 6 Figure 2: FIRM Notes to Users 8 Figure 3: Map Legend for FIRM 11 Figure 4: Floodway Schematic 16 Figure 5: Wave Runup Transect Schematic 19 Figure 6: Coastal Transect Schematic 19 Figure 7: Frequency Discharge-Drainage Area Curves 25 Figure 8: 1% Annual Chance Total Stillwater Elevations for Coastal Areas 29 Figure 9: Transect Location Map 29

Tables Page

Table 1: Listing of NFIP Jurisdictions 2 Table 2: Flooding Sources Included in this FIS Report 18 Table 3: Flood Zone Designations by Community 20 Table 4: Coastal Barrier Resources System Information 20 Table 5: Basin Characteristics 21 Table 6: Principal Flood Problems 21 Table 7: Historic Flooding Elevations 22 Table 8: Non-Levee Flood Protection Measures 22 Table 9: Levees 23 Table 10: Summary of Discharges 25 Table 11: Summary of Non-Coastal Stillwater Elevations 25 Table 12: Stream Gage Information used to Determine Discharges 26 Table 13: Summary of Hydrologic and Hydraulic Analyses 27 Table 14: Roughness Coefficients 29 Table 15: Summary of Coastal Analyses 29 Table 16: Tide Gage Analysis Specifics 29 Table 17: Coastal Transect Parameters 29

iv

Table 18: Summary of Alluvial Fan Analyses 29 Table 19: Results of Alluvial Fan Analyses 30 Table 20: Countywide Vertical Datum Conversion 31 Table 21: Stream-by-Stream Vertical Datum Conversion 31 Table 22: Base Map Sources 32 Table 23: Summary of Topographic Elevation Data used in Mapping 33 Table 24: Floodway Data 34 Table 25: Flood Hazard and Non-Encroachment Data for Selected Streams 41 Table 26: Summary of Coastal Transect Mapping Considerations 41 Table 27: Incorporated Letters of Map Change 42 Table 28: Community Map History 44 Table 29: Summary of Contracted Studies Included in this FIS Report 44 Table 30: Community Meetings 46 Table 31: Map Repositories 47 Table 32: Additional Information 48 Table 33: Bibliography and References 49

Exhibits

Flood Profiles Panel Little Leading Creek 01 P Ohio River 02-13 P

Published Separately

Flood Insurance Rate Map (FIRM)

1

FLOOD INSURANCE STUDY REPORT MEIGS COUNTY, OHIO

SECTION 1.0 – INTRODUCTION

1.1 The National Flood Insurance Program The National Flood Insurance Program (NFIP) is a voluntary Federal program that enables property owners in participating communities to purchase insurance protection against losses from flooding. This insurance is designed to provide an insurance alternative to disaster assistance to meet the escalating costs of repairing damage to buildings and their contents caused by floods. For decades, the national response to flood disasters was generally limited to constructing flood-control works such as dams, levees, sea-walls, and the like, and providing disaster relief to flood victims. This approach did not reduce losses nor did it discourage unwise development. In some instances, it may have actually encouraged additional development. To compound the problem, the public generally could not buy flood coverage from insurance companies, and building techniques to reduce flood damage were often overlooked. In the face of mounting flood losses and escalating costs of disaster relief to the general taxpayers, the U.S. Congress created the NFIP. The intent was to reduce future flood damage through community floodplain management ordinances, and provide protection for property owners against potential losses through an insurance mechanism that requires a premium to be paid for the protection. The U.S. Congress established the NFIP on August 1, 1968, with the passage of the National Flood Insurance Act of 1968. The NFIP was broadened and modified with the passage of the Flood Disaster Protection Act of 1973 and other legislative measures. It was further modified by the National Flood Insurance Reform Act of 1994 and the Flood Insurance Reform Act of 2004. The NFIP is administered by the Federal Emergency Management Agency (FEMA), which is a component of the Department of Homeland Security (DHS). Participation in the NFIP is based on an agreement between local communities and the Federal Government. If a community adopts and enforces floodplain management regulations to reduce future flood risks to new construction and substantially improved structures in Special Flood Hazard Areas (SFHAs), the Federal Government will make flood insurance available within the community as a financial protection against flood losses. The community’s floodplain management regulations must meet or exceed criteria established in accordance with Title 44 Code of Federal Regulations (CFR) Part 60.3, Criteria for land Management and Use. SFHAs are delineated on the community’s Flood Insurance Rate Maps (FIRMs). Under the NFIP, buildings that were built before the flood hazard was identified on the community’s FIRMs are generally referred to as “Pre-FIRM” buildings. When the NFIP was created, the U.S. Congress recognized that insurance for Pre-FIRM buildings would be prohibitively expensive if the premiums were not subsidized by the Federal Government. Congress also recognized that most of these floodprone buildings were built by individuals who did not have sufficient knowledge of the flood hazard to make informed decisions. The NFIP requires that full actuarial rates reflecting the complete flood risk be charged on all buildings constructed or substantially improved on or after the effective date of the initial FIRM for the community or after December 31, 1974, whichever is

2

later. These buildings are generally referred to as “Post-FIRM” buildings.

1.2 Purpose of this Flood Insurance Study Report This Flood Insurance Study (FIS) report revises and updates information on the existence and severity of flood hazards for the study area. The studies described in this report developed flood hazard data that will be used to establish actuarial flood insurance rates and to assist communities in efforts to implement sound floodplain management. In some states or communities, floodplain management criteria or regulations may exist that are more restrictive than the minimum Federal requirements. Contact your State NFIP Coordinator to ensure that any higher State standards are included in the community’s regulations.

1.3 Jurisdictions Included in the Flood Insurance Study Project This FIS Report covers the entire geographic area of Meigs County, Ohio. The jurisdictions that are included in this project area, along with the Community Identification Number (CID) for each community and the 8-digit Hydrologic Unit Codes (HUC-8) sub-basins affecting each, are shown in Table 1. The Flood Insurance Rate Map (FIRM) panel numbers that affect each community are listed. If the flood hazard data for the community is not included in this FIS Report, the location of that data is identified. The location of flood hazard data for participating communities in multiple jurisdictions is also indicated in the table. Jurisdictions that have no identified SFHAs as of the effective date of this study are indicated in the table. Changed conditions in these communities (such as urbanization or annexation) or the availability of new scientific or technical data about flood hazards could make it necessary to determine SFHAs in these jurisdictions in the future.

Table 1: Listing of NFIP Jurisdictions

Community CID

HUC-8 Sub-

Basin(s) Located on FIRM Panel(s)

If Not Included, Location of

Flood Hazard Data

Meigs County, Unincorporated Areas

390387 05030202 05030204 05090101

39105C0010D 39105C0015D 39105C0020D 39105C0030D 39105C0035D 39105C0040D 39105C0045D 39105C0055D 39105C0060D 39105C0065D 39105C0070D 39105C0080D 39105C0090D 39105C0095D 39105C0115D 39105C0117D 39105C0120D 39105C0136D 39105C0138D 39105C0155D 39105C0160D 39105C0165D

3

Table 1: Listing of NFIP Jurisdictions (Cont.)

Community CID

HUC-8 Sub-



Flood Hazard Data

Meigs County, Unincorporated Areas (Cont.)

390387 05030202 05030204 05090101

39105C0170D 39105C0180D 39105C0185D 39105C0190D 39105C0192D 39105C0195D 39105C0205D 39105C0210D 39105C0215D 39105C0216D 39105C0217D 39105C0218D 39105C0230D 39105C0235D 39105C0238D 39105C0240D 39105C0245D 39105C0254D 39105C0255D 39105C0256D 39105C0257D 39105C0258D 39105C0259D 39105C0265D 39105C0266D 39105C0267D 39105C0268D 39105C0269D 39105C0276D 39105C0278D 39105C0301D 39105C0302D 39105C0303D 39105C0304D 39105C0327D 39105C0331D 39105C0332D 39105C0333D 39105C0334D 39105C0341D 39105C0342D 39105C0343D 39105C0344D 39105C0354D 39105C0355D 39105C0356D 39105C0357D 39105C0358D 39105C0359D 39105C0361D 39105C0362D 39105C0363D 39105C0366D 39105C0367D

39105C0385D

Village of Middleport 390388 05030202

39105C0215D 39105C0218D 39105C0302D 39105C0306D

Village of Pomeroy 390389 05030202

39105C0216D 39105C0217D 39105C0218D 39105C0219D 39105C0238D 39105C0240D

Village of Racine 390390 05030202

39105C0331D 39105C0332D 39105C0333D 39105C0334D

Village of Rutland 390670 05030202 39105C0192D 39105C0215D

4

Table 1: Listing of NFIP Jurisdictions (Cont.)

Community CID

HUC-8 Sub-



Flood Hazard Data

Village of Syracuse 390391 05030202

39105C0238D 39105C0240D 39105C0326D 39105C0327D

1.4 Considerations for using this Flood Insurance Study Report The NFIP encourages State and local governments to implement sound floodplain management programs. To assist in this endeavor, each FIS Report provides floodplain data, which may include a combination of the following: 10-, 4-, 2-, 1-, and 0.2-percent annual chance flood elevations (the 1% annual chance flood elevation is also referred to as the Base Flood Elevation (BFE)); delineations of the 1% annual chance and 0.2% annual chance floodplains; and 1% annual chance floodway. This information is presented on the FIRM and/or in many components of the FIS Report, including Flood Profiles, Floodway Data tables, Summary of Non-Coastal Stillwater Elevations tables, and Coastal Transect Parameters tables (not all components may be provided for a specific FIS). This section presents important considerations for using the information contained in this FIS Report and the FIRM, including changes in format and content. Figures 1, 2, and 3 present information that applies to using the FIRM with the FIS Report.

• Part or all of this FIS Report may be revised and republished at any time. In addition, part of this FIS Report may be revised by a Letter of Map Revision (LOMR), which does not involve republication or redistribution of the FIS Report. Refer to Section 6.5 of this FIS Report for information about the process to revise the FIS Report and/or FIRM.

It is, therefore, the responsibility of the user to consult with community officials by contacting the community repository to obtain the most current FIS Report components. Communities participating in the NFIP have established repositories of flood hazard data for floodplain management and flood insurance purposes. Community map repository addresses are provided in Table 31, “Map Repositories,” within this FIS Report.

• New FIS Reports are frequently developed for multiple communities, such as entire counties. A countywide FIS Report incorporates previous FIS Reports for individual communities and the unincorporated area of the county (if not jurisdictional) into a single document and supersedes those documents for the purposes of the NFIP.

The initial Countywide FIS Report for Meigs County became effective on September 18, 2002. Refer to Table 28 for information about subsequent revisions to the FIRMs.

• FEMA does not impose floodplain management requirements or special insurance ratings based on Limit of Moderate Wave Action (LiMWA) delineations at this time. The LiMWA represents the approximate landward limit of the 1.5-foot breaking wave. If the LiMWA is shown on the FIRM, it is being provided by FEMA as information only. For communities that do adopt Zone VE building standards in the area defined by the

5

LiMWA, additional Community Rating System (CRS) credits are available. Refer to Section 2.5.4 for additional information about the LiMWA.

The CRS is a voluntary incentive program that recognizes and encourages community floodplain management activities that exceed the minimum NFIP requirements. Visit the FEMA Web site at http://www.fema.gov or contact your appropriate FEMA Regional Office for more information about this program.

• Previous FIS Reports and FIRMs may have included levees that were accredited as

reducing the risk associated with the 1% annual chance flood based on the information available and the mapping standards of the NFIP at that time. For FEMA to continue to accredit the identified levees, the levees must meet the criteria of the Code of Federal Regulations, Title 44, Section 65.10 (44 CFR 65.10), titled “Mapping of Areas Protected by Levee Systems.” Since the status of levees is subject to change at any time, the user should contact the appropriate agency for the latest information regarding levees presented in Table 9 of this FIS Report. For levees owned or operated by the U.S. Army Corps of Engineers (USACE), information may be obtained from the USACE national levee database. For all other levees, the user is encouraged to contact the appropriate local community.

• FEMA has developed a Guide to Flood Maps (FEMA 258) and online tutorials to assist

users in accessing the information contained on the FIRM. These include how to read panels and step-by-step instructions to obtain specific information. To obtain this guide and other assistance in using the FIRM, visit the FEMA Web site at http://www.fema.gov.

http://www.fema.gov/

HUC8 05030202Upper Ohio-Shade

HUC805030204Hocking

HUC8 05090101Raccoon-Symmes

Strongs Run

Mud

Fork

Little

Leadin

g Cr

eek

Tho m

as Fo

rk

Kingsbury CreekLeading Creek

Ohio River

¬«325

¬«681

¬«143

¬«124

¬«7¬«325

¬«7

¬«689

¬«692

¬«124

¬«32

¬«124

£¤33

£¤33

£¤33

")19

RAILROAD

RAILROAD

VILLAGE OFRUTLAND

390670VILLAGE OF

POMEROY390389

VILLAGE OFMIDDLEPORT

390388

MEIGS COUNTY390387

0219 D9/9/9999

0304 D9/9/9999

0218 D9/9/9999

0216 D9/9/9999

0217 D9/9/9999

0192 D9/9/9999

0301 D9/9/9999

0302 D9/9/9999

0303 D9/9/9999

0306 D9/9/9999

0190 D9/9/9999

*0315 D9/9/9999

0165 D9/9/9999

0040 D9/9/9999

0065 D9/9/9999

0015 D9/9/9999

*0005 D9/9/9999

0010 D9/9/9999

0020 D9/9/9999

*0030 D9/9/9999

*0035 D9/9/9999

0045 D9/9/9999

*0055 D9/9/9999

*0060 D9/9/9999

0070 D9/9/9999

0205 D9/9/9999

0210 D9/9/9999

0180 D9/9/9999

0185 D9/9/9999

0195 D9/9/9999

0155 D9/9/9999

0160 D9/9/9999

0170 D9/9/9999

*0310 D9/9/9999

*0320 D9/9/9999

0215 D9/9/9999

NATIONAL FLOOD INSURANCE PROGRAMFLOOD INSURANCE RATE MAP INDEXMEIGS COUNTY, USA and Incorporated AreasPANELS PRINTED:

MAP NUMBER

EFFECTIVE DATE39105CIND1B

PRELIMINARY

FEMA0010, 0020, 0040, 0045, 0065, 0070, 0160, 0165, 0170, 0180, 0185, 0190, 0192, 0195, 0205, 0210, 0215, 0216, 0217, 0218, 0219, 0301,0302, 0303, 0304, 0306,

HTTP://MSC.FEMA.GOVTHE INFORMATION DEPICTED ON THIS MAP AND SUPPORTINGDOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT

0 8,000 16,000 24,000 32,0004,000Feet

Map Projection:State Plane Ohio South FIPS 3402;North American 1983

1 inch = 14,000 feet 1:168,000

SEE FLOOD INSURANCE STUDY FOR ADDITIONAL INFORMATION

SEE MAP INDEX 39105CIND2X (SHEET 1 OF 2)

*PANEL NOT PRINTED – NO SPECIAL FLOOD HAZARD AREAS

0362 D9/9/9999

0259 D9/9/9999

0269 D9/9/9999

0333 D9/9/9999

0341 D9/9/9999

0357 D9/9/9999

*0368 D9/9/9999

0117 D9/9/9999

0257 D9/9/9999

0256 D9/9/9999

0258 D9/9/9999

0254 D9/9/9999

0266 D9/9/9999

0267 D9/9/9999

0268 D9/9/9999

0356 D9/9/9999

0358 D9/9/9999

0359 D9/9/9999

0366 D9/9/9999

0367 D9/9/9999

0361 D9/9/9999

0363 D9/9/9999

0354 D9/9/9999

0332 D9/9/9999

0331 D9/9/9999

0334 D9/9/99990342 D

9/9/9999

0344 D9/9/9999

0343 D9/9/9999

0238 D9/9/9999

0136 D9/9/9999

0276 D9/9/9999

0278 D9/9/9999

0326 D9/9/9999

0138 D9/9/9999

*0369 D9/9/9999

*0364 D9/9/9999

0327 D9/9/9999

0240 D9/9/9999

*0340 D9/9/9999

0115 D9/9/9999

*0140 D9/9/9999

*0390 D9/9/9999

*0290 D9/9/99990265 D

9/9/9999

0080 D9/9/9999

*0085 D9/9/9999

0095 D9/9/9999

0090 D9/9/9999

*0105 D9/9/9999

*0110 D9/9/9999

0120 D9/9/9999

*0130 D9/9/9999

*0135 D9/9/9999

*0145 D9/9/9999

*0280 D9/9/9999

*0285 D9/9/9999

*0295 D9/9/9999

0255 D9/9/9999

0230 D9/9/9999

0235 D9/9/9999

0245 D9/9/9999

*0330 D9/9/9999

0355 D9/9/9999

*0380 D9/9/9999

0385 D9/9/9999

*0395 D9/9/9999

¬«248

¬«124

¬«681¬«7

¬«681

¬«124

£¤33

£¤33

HUC8 05030204Hocking

HUC8 05030202Upper Ohio-Shade

Yellowbush Creek

Nease

Creek

Oldtown Creek

Johns

Run

Forke

d Ru

n

Horse Cave Creek

East Branch

Shade River

Shad

e River

Groundhog Creek

Middle Branch

Shade River

Shade

River

Ohio

River

Ohio River

VILLAGE OFSYRACUSE

390391

VILLAGE OFPOMEROY

390389

VILLAGEOF RACINE

390390

MEIGS COUNTY390387

NATIONAL FLOOD INSURANCE PROGRAMFLOOD INSURANCE RATE MAP INDEX (2 of 2)MEIGS COUNTY, USA and Incorporated AreasPANELS PRINTED:

MAP NUMBER

EFFECTIVE DATE39105CIND2B

PRELIMINARY

FEMA0080, 0090, 0095, 0115, 0117, 0120, 0136, 0138, 0230, 0235, 0238,0240, 0245, 0254, 0255, 0256, 0257, 0258, 0259, 0265, 0266, 0267,0268, 0269, 0276, 0278, 0326, 0327, 0331, 0332, 0333, 0334, 0341,0342, 0343, 0344, 0354, 0355, 0356, 0357, 0358, 0359, 0361, 0362, 0363, 0366, 0367, 0385,

HTTP://MSC.FEMA.GOVTHE INFORMATION DEPICTED ON THIS MAP AND SUPPORTINGDOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT

0 8,000 16,000 24,000 32,0004,000Feet

Map Projection:State Plane Ohio South FIPS 3402;North American Datum 1983

1 inch = 14,000 feet 1:168,000

SEE FLOOD INSURANCE STUDY FOR ADDITIONAL INFORMATION

SEE

MAP I

NDEX

3910

5CIN

D1X

(SHE

ET 2

OF 2)

* PANEL NOT PRINTED – NO SPECIAL FLOOD HAZARD AREAS

8

Figure 2: FIRM Notes to Users

NOTES TO USERS For information and questions about this map, available products associated with this FIRM including historic versions of this FIRM, how to order products, or the National Flood Insurance Program in general, please call the FEMA Map Information eXchange at 1-877-FEMA-MAP (1-877-336-2627) or visit the FEMA Map Service Center website at http://msc.fema.gov. Available products may include previously issued Letters of Map Change, a Flood Insurance Study Report, and/or digital versions of this map. Many of these products can be ordered or obtained directly from the website. Users may determine the current map date for each FIRM panel by visiting the FEMA Map Service Center website or by calling the FEMA Map Information eXchange. Communities annexing land on adjacent FIRM panels must obtain a current copy of the adjacent panel as well as the current FIRM Index. These may be ordered directly from the Map Service Center at the number listed above. For community and countywide map dates, refer to Table 28 in this FIS Report. To determine if flood insurance is available in the community, contact your insurance agent or call the National Flood Insurance Program at 1-800-638-6620. PRELIMINARY FIS REPORT: FEMA maintains information about map features, such as street locations and names, in or near designated flood hazard areas. Requests to revise information in or near designated flood hazard areas may be provided to FEMA during the community review period, at the final Consultation Coordination Officer's meeting, or during the statutory 90-day appeal period. Approved requests for changes will be shown on the final printed FIRM. The map is for use in administering the NFIP. It may not identify all areas subject to flooding, particularly from local drainage sources of small size. Consult the community map repository to find updated or additional flood hazard information. BASE FLOOD ELEVATIONS: For more detailed information in areas where Base Flood Elevations (BFEs) and/or floodways have been determined, consult the Flood Profiles and Floodway Data and/or Summary of Stillwater Elevations tables within this FIS Report. Use the flood elevation data within the FIS Report in conjunction with the FIRM for construction and/or floodplain management. FLOODWAY INFORMATION: Boundaries of the floodways were computed at cross sections and interpolated between cross sections. The floodways were based on hydraulic considerations with regard to requirements of the National Flood Insurance Program. Floodway widths and other pertinent floodway data are provided in the FIS Report for this jurisdiction. FLOOD CONTROL STRUCTURE INFORMATION: Certain areas not in Special Flood Hazard Areas may be protected by flood control structures. Refer to Section 4.3 "Non-Levee Flood Protection Measures" of this FIS Report for information on flood control structures for this jurisdiction.

http://msc.fema.gov/

Figure 2. FIRM Notes to Users (Cont.)

9

PROJECTION INFORMATION: The projection used in the preparation of the map was State Plane Ohio South, FIPS 3402. The horizontal datum was NAD83, GRS1980 spheroid. Differences in datum, spheroid, projection or State Plane zones used in the production of FIRMs for adjacent jurisdictions may result in slight positional differences in map features across jurisdiction boundaries. These differences do not affect the accuracy of the FIRM. ELEVATION DATUM: Flood elevations on the FIRM are referenced to the North American Vertical Datum of 1988. These flood elevations must be compared to structure and ground elevations referenced to the same vertical datum. For information regarding conversion between the National Geodetic Vertical Datum of 1929 and the North American Vertical Datum of 1988, visit the National Geodetic Survey website at http://www.ngs.noaa.gov/ or contact the National Geodetic Survey at the following address: NGS Information Services NOAA, N/NGS12 National Geodetic Survey SSMC-3, #9202 1315 East-West Highway Silver Spring, Maryland 20910-3282 (301) 713-3242 Local vertical monuments may have been used to create the map. To obtain current monument information, please contact the appropriate local community listed in Table 31 of this FIS Report. BASE MAP INFORMATION: Base map information shown on the FIRM was provided by Meigs County GIS Department. For information about base maps, refer to Section 6.2 “Base Map” in this FIS Report. The map reflects more detailed and up-to-date stream channel configurations than those shown on the previous FIRM for this jurisdiction. The floodplains and floodways that were transferred from the previous FIRM may have been adjusted to conform to these new stream channel configurations. As a result, the Flood Profiles and Floodway Data tables may reflect stream channel distances that differ from what is shown on the map. Corporate limits shown on the map are based on the best data available at the time of publication. Because changes due to annexations or de-annexations may have occurred after the map was published, map users should contact appropriate community officials to verify current corporate limit locations.

http://www.ngs.noaa.gov/

Figure 2. FIRM Notes to Users (Cont.)

10

NOTES FOR FIRM INDEX REVISIONS TO INDEX: As new studies are performed and FIRM panels are updated within Meigs County, USA, corresponding revisions to the FIRM Index will be incorporated within the FIS Report to reflect the effective dates of those panels. Please refer to Table 28 of this FIS Report to determine the most recent FIRM revision date for each community. The most recent FIRM panel effective date will correspond to the most recent index date. SPECIAL NOTES FOR SPECIFIC FIRM PANELS This Notes to Users section was created specifically for Meigs County, USA, effective TBD. FLOOD RISK REPORT: A Flood Risk Report (FRR) may be available for many of the flooding sources and communities referenced in this FIS Report. The FRR is provided to increase public awareness of flood risk by helping communities identify the areas within their jurisdictions that have the greatest risks. Although non-regulatory, the information provided within the FRR can assist communities in assessing and evaluating mitigation opportunities to reduce these risks. It can also be used by communities developing or updating flood risk mitigation plans. These plans allow communities to identify and evaluate opportunities to reduce potential loss of life and property. However, the FRR is not intended to be the final authoritative source of all flood risk data for a project area; rather, it should be used with other data sources to paint a comprehensive picture of flood risk.

11

Figure 3: Map Legend for FIRM

SPECIAL FLOOD HAZARD AREAS: The 1% annual chance flood, also known as the base flood or 100-year flood, has a 1% chance of happening or being exceeded each year. Special Flood Hazard Areas are subject to flooding by the 1% annual chance flood. The Base Flood Elevation is the water surface elevation of the 1% annual chance flood. The floodway is the channel of a stream plus any adjacent floodplain areas that must be kept free of encroachment so that the 1% annual chance flood can be carried without substantial increases in flood heights. See note for specific types. If the floodway is too narrow to be shown, a note is shown.

Special Flood Hazard Areas subject to inundation by the 1% annual chance flood (Zones A, AE, AH, AO, AR, A99, V and VE)

Zone A The flood insurance rate zone that corresponds to the 1% annual chance floodplains. No base (1% annual chance) flood elevations (BFEs) or depths are shown within this zone.

Zone AE The flood insurance rate zone that corresponds to the 1% annual chance floodplains. Base flood elevations derived from the hydraulic analyses are shown within this zone, either at cross section locations or as static whole-foot elevations that apply throughout the zone.

Zone AH The flood insurance rate zone that corresponds to the areas of 1% annual chance shallow flooding (usually areas of ponding) where average depths are between 1 and 3 feet. Whole-foot BFEs derived from the hydraulic analyses are shown at selected intervals within this zone.

Zone AO The flood insurance rate zone that corresponds to the areas of 1% annual chance shallow flooding (usually sheet flow on sloping terrain) where average depths are between 1 and 3 feet. Average whole-foot depths derived from the hydraulic analyses are shown within this zone.

Zone AR The flood insurance rate zone that corresponds to areas that were formerly protected from the 1% annual chance flood by a flood control system that was subsequently decertified. Zone AR indicates that the former flood control system is being restored to provide protection from the 1% annual chance or greater flood.

Zone A99 The flood insurance rate zone that corresponds to areas of the 1% annual chance floodplain that will be protected by a Federal flood protection system where construction has reached specified statutory milestones. No base flood elevations or flood depths are shown within this zone.

Zone V The flood insurance rate zone that corresponds to the 1% annual chance coastal floodplains that have additional hazards associated with storm waves. Base flood elevations are not shown within this zone.

Zone VE Zone VE is the flood insurance rate zone that corresponds to the 1% annual chance coastal floodplains that have additional hazards associated with storm waves. Base flood elevations derived from the coastal analyses are shown within this zone as static whole-foot elevations that apply throughout the zone.

Regulatory Floodway determined in Zone AE.

Figure 3: Map Legend for FIRM (Cont.)

12

OTHER AREAS OF FLOOD HAZARD

Shaded Zone X: Areas of 0.2% annual chance flood hazards and areas of 1% annual chance flood hazards with average depths of less than 1 foot or with drainage areas less than 1 square mile.

Future Conditions 1% Annual Chance Flood Hazard – Zone X: The flood insurance rate zone that corresponds to the 1% annual chance floodplains that are determined based on future-conditions hydrology. No base flood elevations or flood depths are shown within this zone.

Area with Reduced Flood Risk due to Levee: Areas where an accredited levee, dike, or other flood control structure has reduced the flood risk from the 1% annual chance flood. See Notes to Users for important information.

OTHER AREAS

Zone D (Areas of Undetermined Flood Hazard): The flood insurance rate zone that corresponds to unstudied areas where flood hazards are undetermined, but possible

Unshaded Zone X: Areas determined to be outside the 0.2% annual chance flood hazard

FLOOD HAZARD AND OTHER BOUNDARY LINES

(ortho) (vector)

Flood Zone Boundary (white line on ortho-photography-based mapping; gray line on vector-based mapping)

Limit of Study

Jurisdiction Boundary

Limit of Moderate Wave Action (LiMWA): Indicates the inland limit of the area affected by waves greater than 1.5 feet

GENERAL STRUCTURES

Aqueduct Channel Culvert

Storm Sewer

Channel, Culvert, Aqueduct, or Storm Sewer

__________ Dam Jetty Weir

Dam, Jetty, Weir

Levee, Dike, or Floodwall accredited or provisionally accredited to reduce the flood risk from the 1% annual chance flood.

Levee, Dike or Floodwall not accredited to reduce the flood risk from the 1% annual chance flood.

Bridge

Bridge

NO SCREEN


13

COASTAL BARRIER RESOURCES SYSTEM (CBRS) AND OTHERWISE PROTECTED AREAS (OPA): CBRS areas and OPAs are normally located within or adjacent to Special Flood Hazard Areas. See Notes to Users for important information.

CBRS AREA 09/30/2009

Coastal Barrier Resources System Area: Labels are shown to clarify where this area shares a boundary with an incorporated area or overlaps with the floodway.

OTHERWISE PROTECTED

AREA 09/30/2009

Otherwise Protected Area

REFERENCE MARKERS

River mile Markers

CROSS SECTION & TRANSECT INFORMATION

Lettered Cross Section with Regulatory Water Surface Elevation (BFE)

Numbered Cross Section with Regulatory Water Surface Elevation (BFE)

Unlettered Cross Section with Regulatory Water Surface Elevation (BFE)

Coastal Transect

Profile Baseline: Indicates the modeled flow path of a stream and is shown on FIRM panels for all valid studies with profiles or otherwise established base flood elevation.

Coastal Transect Baseline: Used in the coastal flood hazard model to represent the 0.0-foot elevation contour and the starting point for the transect and the measuring point for the coastal mapping.

Base Flood Elevation Line (shown for flooding sources for which no cross sections or profile are available)

ZONE AE (EL 16) Static Base Flood Elevation value (shown under zone label)

ZONE AO (DEPTH 2) Zone designation with Depth

ZONE AO (DEPTH 2)

(VEL 15 FPS) Zone designation with Depth and Velocity


14

BASE MAP FEATURES Missouri Creek River, Stream or Other Hydrographic Feature

Interstate Highway

U.S. Highway

State Highway

County Highway

MAPLE LANE

Street, Road, Avenue Name, or Private Drive if shown on Flood Profile

RAILROAD Railroad

Horizontal Reference Grid Line

Horizontal Reference Grid Ticks

Secondary Grid Crosshairs

Land Grant Name of Land Grant

7 Section Number

R. 43 W. T. 22 N. Range, Township Number 4276000mE Horizontal Reference Grid Coordinates (UTM)

365000 FT Horizontal Reference Grid Coordinates (State Plane)

80° 16’ 52.5” Corner Coordinates (Latitude, Longitude)

15

SECTION 2.0 – FLOODPLAIN MANAGEMENT APPLICATIONS

2.1 Floodplain Boundaries To provide a national standard without regional discrimination, the 1% annual chance (100-year) flood has been adopted by FEMA as the base flood for floodplain management purposes. The 0.2% annual chance (500-year) flood is employed to indicate additional areas of flood hazard in the community. Each flooding source included in the project scope has been studied and mapped using professional engineering and mapping methodologies that were agreed upon by FEMA and Meigs County as appropriate to the risk level. Flood risk is evaluated based on factors such as known flood hazards and projected impact on the built environment. Engineering analyses were performed for each studied flooding source to calculate its 1% annual chance flood elevations; elevations corresponding to other floods (e.g. 10-, 4-, 2-, 0.2-percent annual chance, etc.) may have also been computed for certain flooding sources. Engineering models and methods are described in detail in Section 5.0 of this FIS Report. The modeled elevations at cross sections were used to delineate the floodplain boundaries on the FIRM; between cross sections, the boundaries were interpolated using elevation data from various sources. More information on specific mapping methods is provided in Section 6.0 of this FIS Report. Depending on the accuracy of available topographic data (Table 23), study methodologies employed (Section 5.0), and flood risk, certain flooding sources may be mapped to show both the 1% and 0.2% annual chance floodplain boundaries, regulatory water surface elevations (BFEs), and/or a regulatory floodway. Similarly, other flooding sources may be mapped to show only the 1% annual chance floodplain boundary on the FIRM, without published water surface elevations. In cases where the 1% and 0.2% annual chance floodplain boundaries are close together, only the 1% annual chance floodplain boundary is shown on the FIRM. Figure 3, “Map Legend for FIRM”, describes the flood zones that are used on the FIRMs to account for the varying levels of flood risk that exist along flooding sources within the project area. Table 2 and Table 3 indicate the flood zone designations for each flooding source and each community within Meigs County, USA, respectively. Table 2, “Flooding Sources Included in this FIS Report,” lists each flooding source, including its study limits, affected communities, mapped zone on the FIRM, and the completion date of its engineering analysis from which the flood elevations on the FIRM and in the FIS Report were derived. Descriptions and dates for the latest hydrologic and hydraulic analyses of the flooding sources are shown in Table 13. Floodplain boundaries for these flooding sources are shown on the FIRM (published separately) using the symbology described in Figure 3. On the map, the 1% annual chance floodplain corresponds to the SFHAs. The 0.2% annual chance floodplain shows areas that, although out of the regulatory floodplain, are still subject to flood hazards. Small areas within the floodplain boundaries may lie above the flood elevations but cannot be shown due to limitations of the map scale and/or lack of detailed topographic data. The procedures to remove these areas from the SFHA are described in Section 6.5 of this FIS Report.

16

2.2 Floodways Encroachment on floodplains, such as structures and fill, reduces flood-carrying capacity, increases flood heights and velocities, and increases flood hazards in areas beyond the encroachment itself. One aspect of floodplain management involves balancing the economic gain from floodplain development against the resulting increase in flood hazard. For purposes of the NFIP, a floodway is used as a tool to assist local communities in balancing floodplain development against increasing flood hazard. With this approach, the area of the 1% annual chance floodplain on a river is divided into a floodway and a floodway fringe based on hydraulic modeling. The floodway is the channel of a stream, plus any adjacent floodplain areas, that must be kept free of encroachment in order to carry the 1% annual chance flood. The floodway fringe is the area between the floodway and the 1% annual chance floodplain boundaries where encroachment is permitted. The floodway must be wide enough so that the floodway fringe could be completely obstructed without increasing the water surface elevation of the 1% annual chance flood more than 1 foot at any point. Typical relationships between the floodway and the floodway fringe and their significance to floodplain development are shown in Figure 4. To participate in the NFIP, Federal regulations require communities to limit increases caused by encroachment to 1.0 foot, provided that hazardous velocities are not produced. The floodways in this project are presented to local agencies as minimum standards that can be adopted directly or that can be used as a basis for additional floodway projects.

Figure 4: Floodway Schematic

17

Floodway widths presented in this FIS Report and on the FIRM were computed at cross sections. Between cross sections, the floodway boundaries were interpolated. For certain stream segments, floodways were adjusted so that the amount of floodwaters conveyed on each side of the floodplain would be reduced equally. The results of the floodway computations have been tabulated for selected cross sections and are shown in Table 24, “Floodway Data.”

18

Table 2: Flooding Sources Included in this FIS Report

Flooding Source Community Downstream Limit Upstream Limit

HUC-8 Sub-

Basin(s)

Length (mi) (streams or coastlines)

Area (mi2) (estuaries

or ponding) Floodway

(Y/N)

Zone shown

on FIRM Date of Analysis

Leading Creek Meigs County Unincorporated Parkinson Road State Route 143 05030202 20.3 N A July 2012

Little Leading Creek

Meigs County Unincorporated

A point approximately 800 feet downstream of Happy Hollow Road

A point approximately 1,900 feet downstream of Blackwood Road

05030202 10.0 N A July 2012

Little Leading Creek Village of Rutland

A point approximately 0.6 miles upstream of Higley Road


05030202 1.4 Y AE October 1988

Ohio River

Meigs County Unincorporated, Village of Middleport, Village of Pomeroy, Village of Racine, Village of Syracuse

The Gallia County / Meigs County Boundary

The Athens County / Meigs County Boundary

05030202 57.2 Y AE March 1998

Shade River Meigs County Unincorporated

The Confluence with the Ohio River

The confluence with Middle Branch Shade River and West Branch Shade River

05030202 18.8 N A July 2012

19

All floodways that were developed for this FIS project are shown on the FIRM using the symbology described in Figure 3. In cases where the floodway and l% annual chance floodplain boundaries are either close together or collinear, only the floodway boundary has been shown on the FIRM. For information about the delineation of floodways on the FIRM, refer to Section 6.3.

2.3 Base Flood Elevations The hydraulic characteristics of flooding sources were analyzed to provide estimates of the elevations of floods of the selected recurrence intervals. The Base Flood Elevation (BFE) is the elevation of the 1% annual chance flood. These BFEs are most commonly rounded to the whole foot, as shown on the FIRM, but in certain circumstances or locations they may be rounded to 0.1 foot. Cross section lines shown on the FIRM may also be labeled with the BFE rounded to 0.1 foot. Whole-foot BFEs derived from engineering analyses that apply to coastal areas, areas of ponding, or other static areas with little elevation change may also be shown at selected intervals on the FIRM. Cross sections with BFEs shown on the FIRM correspond to the cross sections shown in the Floodway Data table and Flood Profiles in this FIS Report. BFEs are primarily intended for flood insurance rating purposes. For construction and/or floodplain management purposes, users are cautioned to use the flood elevation data presented in this FIS Report in conjunction with the data shown on the FIRM.

2.4 Non-Encroachment Zones This section is not applicable to this FIS project.

2.5 Coastal Flood Hazard Areas This section is not applicable to this FIS project.

2.5.1 Water Elevations and the Effects of Waves This section is not applicable to this FIS project.

Figure 5: Wave Runup Transect Schematic [Not Applicable to this FIS Project]

2.5.2 Floodplain Boundaries and BFEs for Coastal Areas This section is not applicable to this FIS project.

2.5.3 Coastal High Hazard Areas This section is not applicable to this FIS project.

Figure 6: Coastal Transect Schematic [Not Applicable to this FIS Project]

20

2.5.4 Limit of Moderate Wave Action This section is not applicable to this FIS project.

SECTION 3.0 – INSURANCE APPLICATIONS

3.1 National Flood Insurance Program Insurance Zones For flood insurance applications, the FIRM designates flood insurance rate zones as described in Figure 3, “Map Legend for FIRM.” Flood insurance zone designations are assigned to flooding sources based on the results of the hydraulic or coastal analyses. Insurance agents use the zones shown on the FIRM and depths and base flood elevations in this FIS Report in conjunction with information on structures and their contents to assign premium rates for flood insurance policies. The 1% annual chance floodplain boundary corresponds to the boundary of the areas of special flood hazards (e.g. Zones A, AE, V, VE, etc.), and the 0.2% annual chance floodplain boundary corresponds to the boundary of areas of additional flood hazards. Table 3 lists the flood insurance zones in the unincorporated and incorporated areas of Meigs County.

Table 3: Flood Zone Designations by Community

Community Flood Zone(s)

Meigs County, Unincorporated Areas

A, AE, X

Village of Middleport A, AE, X

Village of Pomeroy A, AE, X

Village of Racine A, AE, X

Village of Rutland A, AE, X

Village of Syracuse AE, X

3.2 Coastal Barrier Resources System This section is not applicable to this FIS project.

Table 4: Coastal Barrier Resources System Information [Not Applicable to this FIS Project]

SECTION 4.0 – AREA STUDIED

4.1 Basin Description Table 5 contains a description of the characteristics of the HUC-8 sub-basins within which each community falls. The table includes the main flooding sources within each basin, a brief description of the basin, and its drainage area.

21

Table 5: Basin Characteristics

HUC-8 Sub-Basin Name

HUC-8 Sub-Basin Number

Primary Flooding Source Description of Affected Area

Drainage Area

(square miles)

Upper Ohio-Shade 05030202 Ohio River

Watershed Covers portions of Ohio and west Virginia, encompasses most of Meigs County

1,417

Raccoon-Symmes 05090101 Raccoon

Creek

Flows from north to south touching the western most portion of Meigs County

1,459

Hocking 05030204 Hocking River

North of Meigs County only touches the county in two small areas 1,196

4.2 Principal Flood Problems Table 6 contains a description of the principal flood problems that have been noted for Meigs County by flooding source.

Table 6: Principal Flood Problems

Flooding Source Description of Flood Problems

All sources Most floods in the Ohio Valley are caused by precipitation of unusual intensity or of unusual duration and extent. Floods may also result from a series of ordinary storms which follow one another in rapid succession or from rain falling at relatively high temperatures on snow-covered areas. Severe thunderstorms frequently cause local flash flooding. General flooding in the basin occurs most frequently during the winter or early spring months, but it can occur at any time during the year


The low-lying areas adjacent to Little Leading Creek within the Village of Rutland are subject to periodic flooding

Table 7 contains information about historic flood elevations in the communities within Meigs County (USGS, 1965). All flows and gage heights represent actual flows occurring at the gage without regulation of upstream dams, before 1937, and with regulation after 1937. The datum of the gage currently is 514.1 feet above mean sea level. This was a non-recording gage before February 7, 1940, with various locations and datums. From February 7, 1940, to September 30, 1950, the gage location was 0.3 mile upstream at present datum. Flow has been regulated by the Muskingum reservoirs system since 1937 and by other reservoirs as built.

22

Table 7: Historic Flooding Elevations

Flooding Source Location

Historic Peak (Feet

NAVD88) Event Date

Approximate Recurrence

Interval (years)

Source of Data

Ohio River Pomeroy, Ohio 70.1 March 30, 1913 USGS gage

Ohio River Pomeroy, Ohio 57 March 21, 1936 USGS gage

Ohio River Pomeroy, Ohio 67.7 January 27, 1937 USGS gage

Ohio River Pomeroy, Ohio 51.4 April 23, 1940 USGS gage



Ohio River Pomeroy, Ohio 55.0 April 16, 1948 USGS gage




4.3 Non-Levee Flood Protection Measures Table 8 contains information about non-levee flood protection measures within Meigs County such as dams, jetties, and or dikes. Levees are addressed in Section 4.4 of this FIS Report.

Table 8: Non-Levee Flood Protection Measures

Flooding Source

Structure Name

Type of Measure Location Description of Measure

Ohio River Flood

Control Reservoirs

Flood Control

Reservoirs Various

There are 34 reservoirs for flood control in the Ohio River basin upstream of Meigs County. This system of flood control reservoirs designed by the USACE reduces both the magnitude and frequency of severe flooding in the Ohio River basin. There are no local flood protection projects for Meigs County along the Ohio River

23

4.4 Levees This section is not applicable to this FIS project.

Table 9: Levees [Not Applicable to this FIS Project]

SECTION 5.0 – ENGINEERING METHODS For the flooding sources in the community, standard hydrologic and hydraulic study methods were used to determine the flood hazard data required for this study. Flood events of a magnitude that are expected to be equaled or exceeded at least once on the average during any 10-, 25-, 50-, 100-, or 500-year period (recurrence interval) have been selected as having special significance for floodplain management and for flood insurance rates. These events, commonly termed the 10-, 25-, 50-, 100-, and 500-year floods, have a 10-, 4-, 2-, 1-, and 0.2% annual chance, respectively, of being equaled or exceeded during any year. Although the recurrence interval represents the long-term, average period between floods of a specific magnitude, rare floods could occur at short intervals or even within the same year. The risk of experiencing a rare flood increases when periods greater than 1 year are considered. For example, the risk of having a flood that equals or exceeds the 100-year flood (1-percent chance of annual exceedance) during the term of a 30-year mortgage is approximately 26 percent (about 3 in 10); for any 90-year period, the risk increases to approximately 60 percent (6 in 10). The analyses reported herein reflect flooding potentials based on conditions existing in the community at the time of completion of this study. Maps and flood elevations will be amended periodically to reflect future changes. The engineering analyses described here incorporate the results of previously issued Letters of Map Change (LOMCs) listed in Table 27, “Incorporated Letters of Map Change”, which include Letters of Map Revision (LOMRs). For more information about LOMRs, refer to Section 6.5, “FIRM Revisions.”

5.1 Hydrologic Analyses Hydrologic analyses were carried out to establish the peak elevation-frequency relationships for floods of the selected recurrence intervals for each flooding source studied. Hydrologic analyses are typically performed at the watershed level. Depending on factors such as watershed size and shape, land use and urbanization, and natural or man-made storage, various models or methodologies may be applied. A summary of the hydrologic methods applied to develop the discharges used in the hydraulic analyses for each stream is provided in Table 13. Greater detail (including assumptions, analysis, and results) is available in the archived project documentation. A summary of the discharges is provided in Table 10. Frequency Discharge-Drainage Area Curves used to develop the hydrologic models may also be shown in Figure 7 for selected flooding sources. A summary of stillwater elevations developed for non-coastal flooding sources is provided in Table 11. (Coastal stillwater elevations are discussed in Section 5.3 and shown in Table 17.) Stream gage information is provided in Table 12.

24

Bulletin 45 (ODNR, 1977) consists of regression equations that utilize topographic and climatological characteristics of the basin, based on regional analysis, to develop a flood-frequency curve. The equations are power equations based on drainage area and main-channel slope. The stage-discharge-frequency curves were produced by the USACE for the "Ohio River Basin Comprehensive Survey, Appendix C, Hydrology" (USACE, 1966). For the Ohio River natural flood frequency computations, the observed peak annual flows for all years since initiation of storage were adjusted to natural conditions by evaluating actual reservoir effects existing at that particular time. The computed natural statistics (mean, standard deviation, and coefficient of skew) for the entire period of record were adjusted by reconciling adjacent points and comparing drainage area proportions to produce consistent statistics throughout the length of the Ohio River (USGS, 1965). Stage-frequency curves were developed by converting flows to stage using crest stage-maximum discharge relationships plotted from historical data and extended rating curves prepared in connection with an Ohio River Standard Project Flood (SPF) study (USACE, 1966). To determine modified flood peaks for the Ohio River, 12 historical floods plus 3 hypothetical ones of greater magnitude were used in the analyses of flow modification (USACE, 1966). The flows for those 15, which are considered representative of the basin, were modified by the operation of USACE reservoirs. The amount of reduction in peak discharge versus the natural one for the foregoing inundations was used to develop curves indicating average reservoir system capability to reduce peak flows for various recurrence intervals. Peak discharges for the 10-, 4-, 2-, 1-, and 0.2-percent-annual-chance storm events were determined at locations throughout each of the base study reaches in Meigs County. Hydrologic calculations were performed using regression equations presented in USGS Scientific Investigations Report (SIR) 2006-5312 (USGS, 2006). The regression equations were developed using generalized least-squares (GLS) regression analyses on data from 305 gaging stations. The equations were developed to estimate flood discharges on unregulated streams based on the total-contributing drainage area, channel slope determined from the 10-85 method, percentage of drainage area as open water and wetlands, and hydrologic regional factors. Additional information about the model development is contained in USGS Water Resources Investigations Report (WRIR) 03-4164 (USGS, 2003). Peak discharges were adjusted to account for the influence of applicable existing stream gages on approximate study reaches.

25

Table 10: Summary of Discharges

Peak Discharge (cfs)

Flooding Source Location

Drainage Area (Square Miles)

10% Annual Chance

4% Annual Chance

2% Annual Chance

1% Annual Chance

0.2% Annual Chance


Approximately 5,100 feet above mouth

25.0 * * * 3,620 *


Approximately 950 feet downstream of Main Street bridge

21.2 * * * 3,410 *

Ohio River At Pomeroy Gage (river mile 251.3**) 40,500 375,000 * 462,000 502,000 600,000

Ohio River At Old Lock and Dam 20 (river mile 202.5**)

39,350 354,000 * 442,000 482,000 584,000

*Not calculated for this FIS project **Distance below Pittsburgh, Pennsylvania

Figure 7: Frequency Discharge-Drainage Area Curves [Not Applicable to this FIS Project]

Table 11: Summary of Non-Coastal Stillwater Elevations

[Not Applicable to this FIS Project]

26

Table 12: Stream Gage Information used to Determine Discharges [Not Applicable to this FIS Project]

5.2 Hydraulic Analyses Analyses of the hydraulic characteristics of flooding from the sources studied were carried out to provide estimates of the elevations of floods of the selected recurrence intervals. Base flood elevations on the FIRM represent the elevations shown on the Flood Profiles and in the Floodway Data tables in the FIS Report. Rounded whole-foot elevations may be shown on the FIRM in coastal areas, areas of ponding, and other areas with static base flood elevations. These whole-foot elevations may not exactly reflect the elevations derived from the hydraulic analyses. Flood elevations shown on the FIRM are primarily intended for flood insurance rating purposes. For construction and/or floodplain management purposes, users are cautioned to use the flood elevation data presented in this FIS Report in conjunction with the data shown on the FIRM. The hydraulic analyses for this FIS were based on unobstructed flow. The flood elevations shown on the profiles are thus considered valid only if hydraulic structures remain unobstructed, operate properly, and do not fail. For streams for which hydraulic analyses were based on cross sections, locations of selected cross sections are shown on the Flood Profiles (Exhibit 1). For stream segments for which a floodway was computed (Section 6.3), selected cross sections are also listed on Table 24, “Floodway Data.” A summary of the methods used in hydraulic analyses performed for this project is provided in Table 13. Roughness coefficients are provided in Table 14. Roughness coefficients are values representing the frictional resistance water experiences when passing overland or through a channel. They are used in the calculations to determine water surface elevations. Greater detail (including assumptions, analysis, and results) is available in the archived project documentation. For streams studied by base analysis cross-section geometry consisted of un-surveyed cross-sections developed from a Digital Elevation Model (DEM) generated using Meigs County LiDAR data. The LiDAR data was obtained from the Ohio Geographically Referenced Information Program (OGRIP) and was flown in 2006. Starting water surface elevations for base studies were determined using normal depth. Manning’s roughness values for base studies were selected based on the 2006 National Landcover Dataset (NLCD) spatial data and visual observation of aerial imagery.

27

Table 13: Summary of Hydrologic and Hydraulic Analyses

Flooding Source Study Limits

Downstream Limit Upstream Limit

Hydrologic Model or

Method Used

Hydraulic Model or

Method Used

Date Analyses

Completed

Flood Zone on

FIRM Special Considerations

Leading Creek Parkinson Road State Route 143

Regression analysis

SIR 2006-5312

HEC-RAS version 4.1.0 July 2012 A



A point approximately 1,900 feet downstream of Blackwood Road

Regression analysis

SIR 2006-5312


1% starting water surface elevation was taken from the 1998 detailed study immediately downstream


A point approximately 0.6 miles upstream of Higley Road


Bulletin No. 45 Regression WSPRO October

1988 AE

There are no stream gage data available for Little Leading Creek; therefore, no adjustments were made to the calculated discharges. Cross-section data, as well as structural geometry and elevations for bridges, were determined from field surveys. The starting water-surface elevation was determined using the slope-conveyance method.

Ohio River

The Gallia County / Meigs County Boundary

The Athens County / Meigs County Boundary

Stage-Discharge-Frequency

curves

HEC-RAS March 1998 AE

The overbank geometry was developed from Gallipolis, Racine, and Belleville pool maps previously developed by the USACE (USACE, 1963). The channel geometry was obtained from river soundings completed by the USACE during the summer of 1997. Starting water-surface elevations were obtained by verifying the normal depth calculations against the recorded high-water marks at individual stations (Anderson, 2000).

28

Table 13: Summary of Hydrologic and Hydraulic Analyses (Cont.)

Flooding Source Study Limits

Downstream Limit Upstream Limit

Hydrologic Model or

Method Used

Hydraulic Model or

Method Used

Date Analyses

Completed

Flood Zone on

FIRM Special Considerations

Shade River The Confluence with the Ohio River

The confluence with Middle Branch Shade River and West Branch Shade River

Regression analysis

SIR 2006-5312


All Base Studies NA NA Regression

analysis SIR 2006-5312


29

Table 14: Roughness Coefficients

Flooding Source Channel “n” Overbank “n”

Little Leading Creek 0.030-0.060 0.030-0.100

Ohio River 0.020-0.036 0.045-0.090

5.3 Coastal Analyses This section is not applicable to this FIS project.

Table 15: Summary of Coastal Analyses [Not Applicable to this FIS Project]

5.3.1 Total Stillwater Elevations This section is not applicable to this FIS project.

Figure 8: 1% Annual Chance Total Stillwater Elevations for Coastal Areas [Not Applicable to this FIS Project]

Table 16: Tide Gage Analysis Specifics [Not Applicable to this FIS Project]

5.3.2 Waves This section is not applicable to this FIS project.

5.3.3 Coastal Erosion This section is not applicable to this FIS project.

5.3.4 Wave Hazard Analyses This section is not applicable to this FIS project.

Table 17: Coastal Transect Parameters [Not Applicable to this FIS Project]

Figure 9: Transect Location Map [Not Applicable to this FIS Project]

5.4 Alluvial Fan Analyses This section is not applicable to this FIS project.

Table 18: Summary of Alluvial Fan Analyses [Not Applicable to this FIS Project]

30

Table 19: Results of Alluvial Fan Analyses [Not Applicable to this FIS Project]

SECTION 6.0 – MAPPING METHODS

6.1 Vertical and Horizontal Control All FIS Reports and FIRMs are referenced to a specific vertical datum. The vertical datum provides a starting point against which flood, ground, and structure elevations can be referenced and compared. Until recently, the standard vertical datum used for newly created or revised FIS Reports and FIRMs was the National Geodetic Vertical Datum of 1929 (NGVD29). With the completion of the North American Vertical Datum of 1988 (NAVD88), many FIS Reports and FIRMs are now prepared using NAVD88 as the referenced vertical datum. Flood elevations shown in this FIS Report and on the FIRMs are referenced to NAVD88. These flood elevations must be compared to structure and ground elevations referenced to the same vertical datum. For information regarding conversion between NGVD29 and NAVD88 or other datum conversion, visit the National Geodetic Survey website at www.ngs.noaa.gov, or contact the National Geodetic Survey at the following address:

NGS Information Services

NOAA, N/NGS12 National Geodetic Survey

SSMC-3, #9202 1315 East-West Highway

Silver Spring, Maryland 20910-3282 (301) 713-3242

Temporary vertical monuments are often established during the preparation of a flood hazard analysis for the purpose of establishing local vertical control. Although these monuments are not shown on the FIRM, they may be found in the archived project documentation associated with the FIS Report and the FIRMs for this community. Interested individuals may contact FEMA to access these data. To obtain current elevation, description, and/or location information for benchmarks in the area, please contact information services Branch of the NGS at (301) 713-3242, or visit their website at www.ngs.noaa.gov. The datum conversion locations and values that were calculated for Meigs County are provided in Table 20.



31

Table 20: Countywide Vertical Datum Conversion

Quadrangle Name Quadrangle

Corner Latitude Longitude

Conversion from NGVD29 to

NAVD88 (feet)

Albany SE 39.125 -82.125 -0.62

Alfred SE 39.125 -81.875 -0.607

Chester SE 39.000 -81.875 -0.633

Coolville SE 39.125 -81.750 -0.604

New Haven SE 38.875 -81.875 -0.594

Pomeroy SE 39.000 -82.000 -0.676

Portland SE 39.000 -81.750 -0.554

Rutland SE 39.000 -82.125 -0.659

Shade SE 39.125 -82.000 -0.627

Vales Mills SE 39.125 -82.250 -0.62

Wilkesville SE 39.000 -82.250 -0.591

Average Conversion from NGVD29 to NAVD88 = -0.617 feet

Table 21: Stream-by-Stream Vertical Datum Conversion [Not Applicable to this FIS Project]

6.2 Base Map The FIRMs and FIS Report for this project have been produced in a digital format. The flood hazard information was converted to a Geographic Information System (GIS) format that meets FEMA’s FIRM database specifications and geographic information standards. This information is provided in a digital format so that it can be incorporated into a local GIS and be accessed more easily by the community. The FIRM Database includes most of the tabular information contained in the FIS Report in such a way that the data can be associated with pertinent spatial features. For example, the information contained in the Floodway Data table and Flood Profiles can be linked to the cross sections that are shown on the FIRMs. Additional information about the FIRM Database and its contents can be found in FEMA’s Guidelines and Standards for Mapping Partners, Appendix L. Base map information shown on the FIRM was derived from the sources described in Table 22.

32

Table 22: Base Map Sources

Data Type Data Provider Data Date

Data Scale Data Description

Digital Orthophoto OSIP 2007 1 foot

GSD Color orthoimagery was provided for Meigs County

Political boundaries Meigs County 2012 NA Municipal and county boundaries

Transportation Features Census 2011 NA Roads and railroads, were from

2011 US Census Tiger Lines

Surface Water Features

National Hydrography

Dataset 2011 NA Streams, rivers, and lakes were

derived from NHD data

6.3 Floodplain and Floodway Delineation The FIRM shows tints, screens, and symbols to indicate floodplains and floodways as well as the locations of selected cross sections used in the hydraulic analyses and floodway computations. For riverine flooding sources, the mapped floodplain boundaries shown on the FIRM have been delineated using the flood elevations determined at each cross section; between cross sections, the boundaries were interpolated using the topographic elevation data described in Table 23 In cases where the 1% and 0.2% annual chance floodplain boundaries are close together, only the 1% annual chance floodplain boundary has been shown. Small areas within the floodplain boundaries may lie above the flood elevations but cannot be shown due to limitations of the map scale and/or lack of detailed topographic data. The floodway widths presented in this FIS Report and on the FIRM were computed for certain stream segments on the basis of equal conveyance reduction from each side of the floodplain. Floodway widths were computed at cross sections. Between cross sections, the floodway boundaries were interpolated. Table 2 indicates the flooding sources for which floodways have been determined. The results of the floodway computations for those flooding sources have been tabulated for selected cross sections and are shown in Table 24, “Floodway Data.” Certain flooding sources may have been studied that do not have published BFEs on the FIRMs, or for which there is a need to report the 1% annual chance flood elevations at selected cross sections because a published Flood Profile does not exist in this FIS Report. These streams may have also been studied using methods to determine non-encroachment zones rather than floodways. For these flooding sources, the 1% annual chance floodplain boundaries have been delineated using the flood elevations determined at each cross section; between cross sections, the boundaries were interpolated using the topographic elevation data described in Table 23. All topographic data used for modeling or mapping has been converted as necessary to NAVD 88. The 1% annual chance elevations for selected cross sections along these flooding sources, along with their non-encroachment widths, if calculated, are shown in Table 25, “Flood Hazard and Non-Encroachment Data for Selected Streams.”

33

Table 23: Summary of Topographic Elevation Data used in Mapping

Source for Topographic Elevation Data

Community Flooding Source Description Scale

Contour Interval Citation

Meigs County and Incorporated Areas

All within Study area LiDAR NA 4 OGRIP

2007

BFEs shown at cross sections on the FIRM represent the 1% annual chance water surface elevations shown on the Flood Profiles and in the Floodway Data tables in the FIS Report.

SECTION MEANWIDTH AREA VELOCITY WITHOUT WITH INCREASE

DISTANCE 1 (FEET) (SQ. FEET) (FEET / SECOND)REGULATORY FLOODWAY FLOODWAY (FEET)

5,135 391 2,230 1.6 574.9 572.6 2 573.4 2 0.85,715 322 1,726 2.1 574.9 572.8 2 573.6 2 0.86,495 171 1,043 3.5 574.9 573.6 2 574.2 2 0.67,800 188 1,081 3.4 575.3 575.3 576.2 0.98,350 258 1,567 2.3 575.8 575.8 576.8 1.09,530 298 1,400 2.6 577.2 577.2 577.9 0.7

10,360 220 1,186 2.9 578.2 578.2 579.0 0.810,930 197 919 3.7 578.5 578.5 579.3 0.811,310 174 924 3.7 579.0 579.0 579.8 0.811,755 247 1,169 2.9 579.7 579.7 580.4 0.712,565 340 1,506 2.3 580.4 580.4 581.4 1.0

LOCATION FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION (FEET NAVD88)

CROSSSECTION

Little LeadingCreek

ABCDEFGHIJK

1 Stream distance in feet above mouth 2 Elevations without considering backwater effects from the Ohio River

Table 24

FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATAMEIGS COUNTY, OHIO

AND INCORPORATED AREAS Little Leading Creek

34

SECTION MEANWIDTH 2 AREA VELOCITY WITHOUT WITH INCREASE


1,349.19 1490 82,658 6.1 574.3 574.3 575.3 1.01,346.72 2201 80,771 6.2 574.5 574.5 575.5 1.01,344.09 2352 95,021 5.3 574.8 574.8 575.8 1.01,340.22 2520 89,567 5.6 575.1 575.1 575.8 0.71,337.56 1677 71,203 7.1 575.3 575.3 576.3 1.01,344.91 1405 78,338 6.4 575.8 575.8 576.8 1.01,332.33 1230 74,176 6.8 576.0 576.0 577.0 1.01,329.70 1241 74,524 7.0 576.3 576.3 577.3 1.01,327.04 1266 66,823 7.5 576.5 576.5 577.5 1.01,324.39 1339 72,406 6.9 577.0 577.0 578.0 1.01,321.81 1222 72,997 6.9 577.5 577.5 578.5 1.01,319.13 1086 68,766 7.3 577.8 577.8 578.8 1.01,316.54 1427 77,243 6.5 578.3 578.3 579.2 0.91,313.89 1501 79,341 6.3 578.6 578.6 579.6 1.01,311.32 1495 76,285 6.6 578.9 578.9 579.8 0.91,308.68 1577 79,331 6.3 579.2 579.2 580.1 0.91,306.07 1407 78,760 6.4 579.4 579.4 580.4 1.01,303.43 1232 68,795 7.3 579.5 579.5 580.5 1.01,300.84 1830 76,173 6.6 580.0 580.0 581.0 1.01,298.24 1653 84,576 5.9 580.4 580.4 581.4 1.01,295.56 1198 71,872 7.0 580.4 580.4 581.4 1.0


CROSSSECTION

Ohio RiverABCD

P

EFGHIJ

QRSTU

KLMNO

1Stream distance in thousands of feet below Pittsburgh 2This Width Extends Beyond the Meigs County Limits

Table 24


AND INCORPORATED AREAS Ohio River

35



1,292.95 1430 77,511 6.5 580.6 580.6 581.6 1.01,290.35 1450 75,840 6.6 580.7 580.7 581.7 1.01,287.71 1465 73,844 6.8 580.8 580.8 581.8 1.01,285.07 1370 69,957 7.2 580.9 580.9 581.9 1.01,282.43 2314 98,283 5.1 581.5 581.5 582.5 1.01,279.93 2480 94,350 5.3 581.5 581.5 582.5 1.01,277.28 1423 79,120 6.3 581.7 581.7 582.7 1.01,274.55 1591 79,990 6.3 582.1 582.1 583.1 1.01,271.88 1546 81,406 6.2 582.3 582.3 583.3 1.01,269.21 1351 70,722 7.1 582.4 582.4 583.4 1.01,266.62 1280 63,500 7.9 582.5 582.5 583.5 1.01,261.02 1100 66,157 7.6 582.8 582.8 583.8 1.01,261.42 1625 86,919 5.8 583.4 583.4 584.4 1.01,258.73 1660 101,238 5.0 583.6 583.6 584.6 1.01,256.33 1618 89,128 5.6 583.6 583.6 584.6 1.01,253.57 1435 77,511 6.2 583.8 583.8 584.8 1.01,250.93 1225 65,344 7.4 583.9 583.9 584.9 1.01,249.65 1310 69,078 7.0 584.2 584.2 585.2 1.01,246.93 1520 74,493 6.5 584.5 584.5 585.5 1.01,244.39 2240 98,377 4.9 585.0 585.0 586.0 1.0


CROSSSECTION

Ohio River(continued)

VWXYZ

AAABACADAEAFAGAH

AO

AMAN

AIAJAKAL


Table 24



36



1,241.66 2670 112,875 4.3 585.1 585.1 586.1 1.01,239.07 2220 101,254 4.8 585.2 585.2 586.2 1.01,236.41 1215 69,606 6.9 585.5 585.5 586.4 0.91,233.82 1310 71,484 6.7 585.8 585.8 586.8 1.01,231.12 1435 76,938 6.3 586.1 586.1 587.1 1.01,228.50 1440 79,657 6.1 586.3 586.3 587.3 1.01,225.86 1355 76,764 6.3 586.5 586.5 587.4 0.91,223.20 1490 84,622 5.7 586.8 586.8 587.7 0.91,220.79 2178 93,609 5.2 587.1 587.1 588.0 0.91,218.13 2175 97,532 4.9 587.3 587.3 588.2 0.91,215.55 1899 89,830 5.4 587.5 587.5 588.4 0.91,212.90 1735 95,178 5.1 587.7 587.7 588.7 1.01,210.25 1665 86,340 5.6 587.9 587.9 588.9 1.01,207.58 3266 120,994 4.0 588.2 588.2 589.2 1.01,205.01 2278 86,372 5.6 588.2 588.2 589.2 1.01,202.38 1565 76,924 6.3 588.6 588.6 589.5 0.91,199.77 1380 68,049 7.1 588.7 588.7 589.6 0.91,197.28 2288 105,843 4.6 589.2 589.2 590.2 1.01,194.70 2522 95,789 5.0 589.3 589.3 590.2 0.91,191.99 1465 80,969 6.0 589.4 589.4 590.4 1.0


CROSSSECTION


APAQARASATAUAVAWAX

BEBFBG

AYAZBABBBCBD

BHBI


Table 24



37



1,189.36 1435 73,405 6.6 589.6 589.6 590.6 1.01,186.71 1485 76,090 6.3 590.0 590.0 590.9 0.91,184.19 1293 69,058 7.0 590.1 590.1 591.0 0.91,181.68 1675 79,176 6.1 590.5 590.5 591.5 1.01,178.93 1345 69,082 7.0 590.6 590.6 591.6 1.01,176.26 1275 63,062 7.6 590.8 590.8 591.7 0.91,173.65 1430 76,202 6.3 591.3 591.3 592.3 1.01,171.15 1740 91,142 5.3 591.6 591.6 592.6 1.01,168.51 1478 82,996 5.8 591.6 591.6 592.6 1.01,165.87 1185 63,285 7.6 591.6 591.6 592.6 1.01,163.09 1240 62,255 7.7 591.9 591.9 592.9 1.01,160.46 1320 70,828 6.8 592.4 592.4 593.3 0.91,157.87 1265 69,377 7.0 592.5 592.5 593.4 0.91,155.25 1180 67,605 7.1 592.6 592.6 593.6 1.01,152.65 1650 85,676 5.6 593.1 593.1 594.1 1.01,149.98 3280 109,709 4.4 593.4 593.4 594.4 1.01,147.33 3134 105,026 4.6 593.5 593.5 594.5 1.01,144.76 2510 102,381 4.7 593.6 593.6 594.5 0.91,142.12 1365 71,019 6.8 593.7 593.7 594.6 0.91,139.34 1325 66,900 7.2 593.9 593.9 594.8 0.9


CROSSSECTION


BJBKBLBMBNBOBPBQBRBSBTBUBV

CC

BWBXBYBZCACB


Table 24



38



1,136.55 1870 93,971 5.1 594.5 594.5 595.5 1.01,133.83 1760 89,109 5.4 594.7 594.7 595.7 1.01,131.26 1670 82,135 5.9 594.8 594.8 595.8 1.01,128.75 1510 76,259 6.3 595.0 595.0 595.9 0.91,126.19 1200 62,678 7.7 595.0 595.0 595.9 0.91,123.63 1538 79,409 6.1 595.5 595.5 596.5 1.01,121.13 1295 66,181 7.3 595.5 595.5 596.5 1.01,118.50 1480 71,156 6.8 595.8 595.8 596.8 1.01,115.83 1280 63,976 7.5 595.9 595.9 596.8 0.91,113.26 1090 57,965 8.3 596.0 596.0 597.0 1.01,110.53 1163 68,360 7.1 596.5 596.5 597.4 0.91,107.87 1330 72,662 6.6 596.8 596.8 597.7 0.91,105.20 1265 68,331 7.1 596.9 596.9 597.8 0.91,102.57 1355 70,660 6.8 597.2 597.2 598.1 0.91,099.96 1480 72,769 6.6 597.4 597.4 598.3 0.91,097.42 1450 73,021 6.6 597.6 597.6 598.6 1.01,094.77 1533 74,845 6.4 597.9 597.9 598.8 0.91,092.17 1712 72,850 6.6 598.0 598.0 599.0 1.01,089.46 1566 74,791 6.4 598.3 598.3 599.2 0.91,086.80 1385 69,793 6.9 598.5 598.5 599.4 0.9


CROSSSECTION


CDCECFCGCHCICJCKCL

CSCTCUCV

CMCNCOCPCQCR

CW1Stream distance in thousands of feet below Pittsburgh 2This Width Extends Beyond the Meigs County Limits

Table 24



39



1,084.18 1685 79,607 6.1 598.8 598.8 599.8 1.01,081.46 1769 85,197 5.7 599.0 599.0 599.9 0.91,078.86 2509 79,978 6.0 599.4 599.4 600.3 0.91,076.22 3195 80,472 6.0 599.5 599.5 600.5 1.01,073.54 2250 72,841 6.6 599.8 599.8 600.8 1.01,070.89 1635 74,049 6.5 600.1 600.1 601.1 1.01,068.31 1604 74,264 6.5 600.3 600.3 601.3 1.01,065.66 1565 72,443 6.7 600.6 600.6 601.5 0.91,063.00 1230 63,826 7.6 600.7 600.7 601.7 1.01,060.34 1060 61,761 7.8 601.0 601.0 602.0 1.0


CROSSSECTION


CXCYCZDADBDCDDDEDFDG


Table 24



40

41

Table 25: Flood Hazard and Non-Encroachment Data for Selected Streams [Not Applicable to this FIS Project]

6.4 Coastal Flood Hazard Mapping This section is not applicable to this FIS project.

Table 26: Summary of Coastal Transect Mapping Considerations [Not Applicable to this FIS Project]

6.5 FIRM Revisions This FIS Report and the FIRM are based on the most up-to-date information available to FEMA at the time of its publication; however, flood hazard conditions change over time. Communities or private parties may request flood map revisions at any time. Certain types of requests require submission of supporting data. FEMA may also initiate a revision. Revisions to FIS projects may take several forms, including Letters of Map Amendment (LOMAs), Letters of Map Revision Based on Fill (LOMR-Fs), Letters of Map Revision (LOMRs) (referred to collectively as Letters of Map Change (LOMCs)), Physical Map Revisions (PMRs), and FEMA-contracted restudies. These types of revisions are further described below. Some of these types of revisions do not result in the republishing of the FIS Report. To assure that any user is aware of all revisions, it is advisable to contact the community repository of flood-hazard data (shown in Table 31, “Map Repositories”).

6.5.1 Letters of Map Amendment A LOMA is an official revision by letter to an effective NFIP map. A LOMA results from an administrative process that involves the review of scientific or technical data submitted by the owner or lessee of property who believes the property has incorrectly been included in a designated SFHA. A LOMA amends the currently effective FEMA map and establishes that a specific property is not located in a SFHA. A LOMA cannot be issued for properties located on the PFD (primary frontal dune). To obtain an application for a LOMA, visit http://www.fema.gov and download the form “MT-1 Application Forms and Instructions for Conditional and Final Letters of Map Amendment and Letters of Map Revision Based on Fill”. Visit the “Flood Map-Related Fees” section to determine the cost, if any, of applying for a LOMA. FEMA offers a tutorial on how to apply for a LOMA. The LOMA Tutorial Series can be accessed at http://www.fema.gov/plan/prevent/fhm/ot_lmreq.shtm. For more information about how to apply for a LOMA, call the FEMA Map Information eXchange; toll free, at 1-877-FEMA MAP (1-877-336-2627).

6.5.2 Letters of Map Revision Based on Fill A LOMR-F is an official revision by letter to an effective NFIP map. A LOMR-F states FEMA’s determination concerning whether a structure or parcel has been elevated on fill above the base flood elevation and is, therefore, excluded from the SFHA.


http://www.fema.gov/plan/prevent/fhm/ot_lmreq.shtm

42

Information about obtaining an application for a LOMR-F can be obtained in the same manner as that for a LOMA, by visiting http://www.fema.gov for the “MT-1 Application Forms and Instructions for Conditional and Final Letters of Map Amendment and Letters of Map Revision Based on Fill” or by calling the FEMA Map Information eXchange, toll free, at 1-877-FEMA MAP (1-877-336-2627). Fees for applying for a LOMR-F, if any, are listed in the “Flood Map-Related Fees” section. A tutorial for LOMR-F is available at http://www.fema.gov/plan/prevent/fhm/ot_lmreq.shtm.

6.5.4 Letters of Map Revision A LOMR is an official revision to the currently effective FEMA map. It is used to change flood zones, floodplain and floodway delineations, flood elevations and planimetric features. All requests for LOMRs should be made to FEMA through the chief executive officer of the community, since it is the community that must adopt any changes and revisions to the map. If the request for a LOMR is not submitted through the chief executive officer of the community, evidence must be submitted that the community has been notified of the request. To obtain an application for a LOMR, visit http://www.fema.gov and download the form “MT-2 Application Forms and Instructions for Conditional Letters of Map Revision and Letters of Map Revision”. Visit the “Flood Map-Related Fees” section to determine the cost of applying for a LOMR. For more information about how to apply for a LOMR, call the FEMA Map Information eXchange; toll free, at 1-877-FEMA MAP (1-877-336-2627) to speak to a Map Specialist. Previously issued mappable LOMCs (including LOMRs) that have been incorporated into the Meigs County FIRM are listed in Table 27.

Table 27: Incorporated Letters of Map Change [Not Applicable to this FIS Project]

6.5.3 Physical Map Revisions PMRs are an official republication of a community’s NFIP map to effect changes to base flood elevations, floodplain boundary delineations, regulatory floodways and planimetric features. These changes typically occur as a result of structural works or improvements, annexations resulting in additional flood hazard areas or correction to base flood elevations or SFHAs. The community’s chief executive officer must submit scientific and technical data to FEMA to support the request for a PMR. The data will be analyzed and the map will be revised if warranted. The community is provided with copies of the revised information and is afforded a review period. When the base flood elevations are changed, a 90-day appeal period is provided. A 6-month adoption period for formal approval of the revised map(s) is also provided. For more information about the PMR process, please visit http://www.fema.gov and visit the “Flood Map Revision Processes” section.

6.5.4 Contracted Restudies The NFIP provides for a periodic review and restudy of flood hazards within a given community. FEMA accomplishes this through a national watershed-based mapping needs assessment strategy, known as the Coordinated Needs Management Strategy (CNMS). The CNMS is used by FEMA


http://www.fema.gov/plan/prevent/fhm/ot_lmreq.shtm



43

to assign priorities and allocate funding for new flood hazard analyses used to update the FIS Report and FIRM. The goal of CNMS is to define the validity of the engineering study data within a mapped inventory. The CNMS is used to track the assessment process, document engineering gaps and their resolution, and aid in prioritization for using flood risk as a key factor for areas identified for flood map updates. Visit www.fema.gov to learn more about the CNMS or contact the FEMA Regional Office listed in Section 8 of this FIS Report.

6.5.5 Community Map History The current FIRM presents flooding information for the entire geographic area of Meigs County. Previously, separate FIRMs, Flood Hazard Boundary Maps (FHBMs) and/or Flood Boundary and Floodway Maps (FBFMs) may have been prepared for the incorporated communities and the unincorporated areas in the county that had identified SFHAs. Current and historical data relating to the maps prepared for the project area are presented in Table 28, “Community Map History.” A description of each of the column headings and the source of the date is also listed below.

• Community Name includes communities falling within the geographic area shown on the FIRM, including those that fall on the boundary line, nonparticipating communities, and communities with maps that have been rescinded. Communities with No Special Flood Hazards are indicated by a footnote. If all maps (FHBM, FBFM, and FIRM) were rescinded for a community, it is not listed in this table unless SFHAs have been identified in this community.

• Initial Identification Date (First NFIP Map Published) is the date of the first NFIP map

that identified flood hazards in the community. If the FHBM has been converted to a FIRM, the initial FHBM date is shown. If the community has never been mapped, the upcoming effective date or “pending” (for Preliminary FIS Reports) is shown. If the community is listed in Table 28 but not identified on the map, the community is treated as if it were unmapped.

• Initial FHBM Effective Date is the effective date of the first Flood Hazard Boundary Map

(FHBM). This date may be the same date as the Initial NFIP Map Date.

• FHBM Revision Date(s) is the date(s) that the FHBM was revised, if applicable.

• Initial FIRM Effective Date is the date of the first effective FIRM for the community. This is the first effective date that is shown on the FIRM panel.

• FIRM Revision Date(s) is the date(s) the FIRM was revised, if applicable. This is the

revised date that is shown on the FIRM panel, if applicable. As countywide studies are completed or revised, each community listed should have its FIRM dates updated accordingly to reflect the date of the countywide study. Once the FIRMs exist in countywide format, as Physical Map Revisions (PMR) of FIRM panels within the county are completed, the FIRM Revision Dates in the table for each community affected by the PMR are updated with the date of the PMR, even if the PMR did not revise all the panels within that community.

The initial effective date for the Meigs County FIRMs in countywide format was 09/18/2002


44

Table 28: Community Map History

Community Name

Initial Identification Date (First NFIP Map Published)

Initial FHBM Effective

Date

FHBM Revision Date(s)

Initial FIRM Effective

Date

FIRM Revision Date(s)

Meigs County (Unincorporated Areas)

01/13/1978 01/13/1978 N/A 11/16/1995 09/18/2002

Middleport, Village of 05/31/1974 05/31/1974 05/21/1976 09/29/1978 09/18/2002

Poweroy, Village of 02/15/1974 02/15/1974 04/30/1976 07/05/1983 09/18/2002

Racine, Village of 04/05/1974 04/05/1974 05/21/1976 08/15/1983 09/18/2002

Rutland, Village of 11/08/1974 11/08/1974 05/21/1976 11/02/1990 09/18/2002

Syracuse, Village of 04/05/1974 04/05/1974 06/11/1976 07/05/1983 09/18/2002

SECTION 7.0 – CONTRACTED STUDIES AND COMMUNITY COORDINATION

7.1 Contracted Studies Table 29 provides a summary of the contracted studies, by flooding source, that are included in this FIS Report.

Table 29: Summary of Contracted Studies Included in this FIS Report

Flooding Source

FIS Report Dated Contractor Number

Work Completed

Date Affected Communities

Ohio River 09/18/2002 USACE

Huntington District

N/A March 1998

Meigs County unincorporated Areas, Village of Middleport, Village of Pomeroy, Village of Racine, Village of Syracuse

Little Leading Creek 11/02/1990 USGS

EMW-88-E-2738 Project Order

Number 1

Octpber 1988

Village of Rutland

45

Table 29: Summary of Contracted Studies Included in this FIS Report (Cont.)

Flooding Source

FIS Report Dated Contractor Number

Work Completed

Date Affected Communities

All Base Studies TBD

Ohio Department of Natural Resources and Stantec Consulting

Services Inc.

CTP-MAS 7 DNR-110020-10

TBD

Meigs County unincorporated Areas, Village of Middleport, Village of Pomeroy, Village of Racine, Village of Rutland

7.2 Community Meetings The dates of the community meetings held for this FIS project and any previous FIS projects are shown in Table 30. These meetings may have previously been referred to by a variety of names (Community Coordination Officer (CCO), Scoping, Discovery, etc.), but all meetings represent opportunities for FEMA, community officials, study contractors, and other invited guests to discuss the planning for and results of the project.

46

Table 30: Community Meetings

Community FIS Report Dated Date of Meeting Meeting Type Attended By

Meigs County (Unincorporated Areas)

11/16/1995 10/12/1993 Initial CCO

Community notified by letter 09/30/1994 Final CCO FEMA, this community and the study contractor

Middleport, Village of 03/1978 03/02/1977 Initial CCO FEMA, this community and the study contractor 11/29/1977 Final CCO FEMA, this community and the study contractor

Pomeroy, Village of 01/05/1983 N/A Initial CCO FEMA, this community and the study contractor 08/16/1982 Final CCO FEMA, this community and the study contractor

Racine, Village of 11/02/1990 N/A Initial CCO

FEMA, this community and the study contractor

09/13/1982 Final CCO FEMA, this community and the study contractor

Rutland, Village of 11/02/1990 08/20/1987 Initial CCO FEMA, this community and the study contractor 12/05/1989 Final CCO FEMA, this community and the study contractor

Syracuse, Village of 01/05/1983 N/A Initial CCO FEMA, this community and the study contractor 09/02/1982 Final CCO FEMA, this community and the study contractor

Meigs County and Incorporated Areas

09/18/2002 10/10/2000 Initial CCO Community notified by letter 07/25/2001 07/06/2011

Final CCO FEMA, this community and the study contractor

TBD Discovery FEMA, this community and the study contractor

TBD Final CCO FEMA, this community and the study contractor 11/27/1970 Initial CCO FEMA, this community and the study contractor

47

SECTION 8.0 – ADDITIONAL INFORMATION

Information concerning the pertinent data used in the preparation of this FIS Report can be obtained by submitting an order with any required payment to the FEMA Engineering Library. For more information on this process, see http://www.fema.gov. Table 31 is a list of the locations where FIRMs for Meigs County can be viewed. Please note that the maps at these locations are for reference only and are not for distribution. Also, please note that only the maps for the community listed in the table are available at that particular repository. A user may need to visit another repository to view maps from an adjacent community.

Table 31: Map Repositories

Community Address City State Zip Code

Meigs County,

Unincorporated Areas

Meigs County Tax Map Office

100 East 2nd Street

Pomeroy Ohio 45769

Village of Middleport Middleport Village Hall

237 Race Street

Middleport Ohio 45760

Village of Pomeroy Pomeroy Village Hall

660 East Main Street, Suite A Pomeroy Ohio 45769

Village of Racine Racine Village hall

405 Main Street

Racine Ohio 45771

Village of Rutland Rutland Village Hall

337 Main Street

Rutland Ohio 45775

Village of Syracuse Syracuse Village hall

2581 Third Street

Syracuse Ohio 45779

The National Flood Hazard Layer (NFHL) dataset is a compilation of effective FIRM databases and LOMCs. Together they create a GIS data layer for a State or Territory. The NFHL is updated as studies become effective and extracts are made available to the public monthly. NFHL data can be viewed or ordered from the website shown in Table 32. Table 32 contains useful contact information regarding the FIS Report, the FIRM, and other relevant flood hazard and GIS data. In addition, information about the state NFIP Coordinator and GIS Coordinator is shown in this table. At the request of FEMA, each Governor has designated an agency of State or territorial government to coordinate that State's or territory's NFIP activities. These agencies often assist communities in developing and adopting necessary floodplain management measures. State GIS Coordinators are knowledgeable about the availability and location of state and local GIS data in their state.

48

Table 32: Additional Information

FEMA and the NFIP

FEMA and FEMA Engineering Library website

http://www.fema.gov

NFIP website http://www.fema.gov/business/nfip

NFHL Dataset http://msc.fema.gov

FEMA Region V FEMA Region V 536 South Clark Street, 6th Floor Chicago, Il 60605 (312) 408-4469

Other Federal Agencies

USGS website http://www.usgs.gov

Hydraulic Engineering Center website

http://www.hec.usace.army.mil

State Agencies and Organizations

State NFIP Coordinator Christopher M. Thoms, CFM, Program Manager Ohio Department of Natural Resources Division of Soil & Water Resources Floodplain Management Program 2045 Morse Road Building B-2 Columbus, OH 43229-6693 (614) 265-6752

State GIS Coordinator Jeff Smith, Spatial Data Infrastructure Manager Ohio Geographically Referenced Information Program Office of Information Technology 77 S. High St. - 19th Floor Columbus, OH 43215 614.466.8862

State Flood Mapping Coordinator

Katherine M. Skalak, EIT, Environmental Specialist Ohio Department of Natural Resources Division of Soil & Water Resources Floodplain Management Program 2045 Morse Road Building B-2 Columbus, OH 43229-6693 (614) 265-6709

SECTION 9.0 – BIBLIOGRAPHY AND REFERENCES Table 33 includes sources used in the preparation of and cited in this FIS Report as well as additional studies that have been conducted in the study area.


http://www.fema.gov/business/nfip

http://msc.fema.gov/

http://www.usgs.gov/

http://www.hec.usace.army.mil/

49

Table 33: Bibliography and References

Citation in this FIS

Publisher/ Issuer

Publication Title, “Article,” Volume, Number, etc. Author/Editor

Place of Publication

Publication Date/

Date of Issuance Link

ODNR, 1977

Ohio Department of Natural Resources, Division of Water

Bulletin No. 45, Floods in Ohio, Magnitude and Frequency

E.E. Webber and W.P. Barlett, Jr. NA May, 1977

USACE, 1966 U.S. Army Corps of Engineers

Ohio River Basin Comprehensive Survey, Appendix C, Hydrology

U.S. Army Corps of Engineers

Cincinnati, Ohio August 1966

USGS, 1965 U.S. Government Printing Office

Magnitude and Frequency of Floods in the United States, Water Supply Paper 1675

U.S. Department of the Interior,

U.S. Geological Survey

Washington, D.C. 1965

USGS, 2003

U.S. Department of

the Interior, U.S. Geological

Survey

USGS Water Resources Investigations Report (WRIR) 03-4164

G.F. Koltun Columbus, Ohio 2003

USGS, 2006

U.S. Department of

the Interior, U.S. Geological

Survey

USGS Scientific Investigations Report (SIR) 2006-5312

G. F. Koltun, Stephanie P.

Kula, and Barry M. Puskas

Reston, Virginia 2006

Date post:	24-Jul-2020
Category:	Documents
Upload:	others
View:	0 times
Download:	0 times

VOLUME 1 MEIGS COUNTY, OHIO€¦ · 1.1 The National Flood Insurance Program The National Flood...

Documents