Moving from 1:100K NHD to 1:24K Resolution: Case Studies Paul Andrews (presenter), Peter Ilieve, Ken...

Toxicology Research Support ServicesMoving from 1:100K NHD to 1:24K Resolution: Case Studies

Paul Andrews (presenter), Peter Ilieve,

Ken Gilland, Bill Cooter (RTI International)

Bill Kramer, and Thomas Dewald (U.S. EPA)

Toxicology Research Support Services

Acknowledgements

• Thomas Dewald (U.S. EPA/AWPD)

• Bill Kramer (U.S EPA/OST)

• Thomas Dabolt (U.S. EPA/AWPD)

• Michael Plastino (U.S. EPA/IO)

Prepared by RTI International under contract with EPA Office of Water


Introduction

• Background Information

• Comparison of 1:100K NHD to 1:24K NHD

• Case Studies of 303(d), 305(b), and WQS Reach Indexing to 1:24K NHD

Overview

4

http://www.epa.gov/waters/enviromapper


Indexing Tools and Resources

• National Hydrography Dataset (NHD)

• NHD Reach Indexing Tool (NHD-RIT)

• Automated Georeferencing Processes (e.g., for Adding General Use Waters)


National Hydrography Dataset (NHD) Set of spatial data that contains

information about surface water features.

Surface water features are represented by "reaches," which are assigned unique identifiers

Contains 52 feature types including: streams, lakes, reservoirs, canals and dams.

Based upon the USGS Digital Line Graph (DLG) hydrography and the EPA Reach File Version 3 (RF3).

1:100,000-scale NHD (hi res IP)

NHD is available online at http://nhd.usgs.gov/

Toxicology Research Support Services Georeferencing (reach indexing): The

process of describing (or locating) entities in a GIS coverage; assigning an NHD reach code to the waterbody feature.

Reach Indexing Tool (RIT): ArcView 3.x extension; Tool for georeferencing surface water features to reaches in NHD.

Georeferencing and RIT are available online at: www.epa.gov/owow/monitoring/georef/

RIT was 1st and 2nd prize winner at the ESRI International User Conferences in San Diego, CA

http://www.epa.gov/owow/monitoring/georef/


EPA Program Database Link to GISDatabase

Event Table Indexed to NHD

NHD Coverage

GIS Map

MO1009MO1008

MO101010300102003685



20 Subbasins Analyzed from 18 States


KY Subbasin 05130102


1:100K NHD/1:24K NHD Comparison



1:100K NHD Reach


0

100


1:24K NHD Reach


0

100


1:100K

1,129

2,342

37.43

1:24K

3,482

1,279

16.92

Comparison of 1:100K and 1:24K NHD Subbasins: Linear Reaches

Average Number

Average Length (m)

Percent Named


1:100K

100

0.222

23.45

1:24K

1,291

0.026

2.54

Comparison of 1:100K and 1:24K NHD Subbasins: Waterbody Reaches

Average Number

Average Area (km2)

Percent Named

Toxicology Research Support ServicesNameChattahoochee River, GA

White River, VT

Green River, WY

Teagle Wash, CA

Mississippi River, MN

Change19%

2%

<1%

-9%

-14%

Change in Reach Length for Specific Rivers


303(d)

Georeferencing


NameCrooked Creek

Brush Creek

Wood Creek

Increase1%

2%

27%

Increase in 303(d) Reach Length for Kentucky Rivers: Subbasin 05130102


NameMonongahela River

Owl Creek

Laurel Run

Increase1%

3%

4%

Increase in 303(d) Reach Length for West Virginia Rivers: Subbasin 05020003




1:100K to 1:24K Shape Comparison



NameWood Creek Lake, KY

Deckers Creek Reservoirs, WV

Laurel Run Reservoirs, WV

Los Gatos Creek Reservoirs, CA

Coyote Creek Reservoirs, CA

Change-15%

-2%

-25%

5%

12%

Change in 303(d) Reach Areas for Lakes


305(b)

Georeferencing


WV Subbasin 05020003


Added 1:24K Lakes



Water Quality Standards

Georeferencing


NE Subbasin 10220004


1:100K Indexing with Point Event



1:24K Indexing with Reach Located





1:24K General Use Waters




Attribute

Total Reach Length

Total Waterbody Area

Increase

39%

53%

Increase in Total Reach Length and Area for KY Subbasin 05130102


Conclusions

• 1:24K NHD significantly increases the number of waterbodies that can be mapped

• Greater detail changes the shapes and lengths of NHD features

• Changes will impact mapping activities for all programs – tools will minimize impact


More Information & TrainingNHD web site:

http://nhd.usgs.gov/

NHD-RIT and Reach Indexing Web Site:www.epa.gov/owow/monitoring/georef/

EPA Watershed Assessment, Tracking & Environmental Results (WATERS)http://www.epa.gov/waters/

EPA Office of Water EnviroMapperhttp://www.epa.gov/waters/enviromapper

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