DISi'RIBU'l,'ii UkLIMITED. LEVEL' DELAWARE RIVER BASIN 11L LUBBERS RUNSUSSEX COUNTY NEW JERSEY LAKE LACKAWANNA DAM DTIC ~ELECTEy NJ 00817 4 '" 9 b D __2 EJ INSPECT NEPRT !!1 bN !ATIONAL' PAM SAFETY .PROGRAM. Lake Lackawanna Dam (N-.-0817) Delaware River Basin, Lubbers Run, Sussex County New Jersey. Phase 1 Inspecion Report* .,- FOR ,F/ 'A^[ .r " ('~ UNLMIThD. g~S DOMAENT IS BEST QUALITY P'~.IUTION U LMTD I ,c)PY UBTSIEDTO DDC CNTIM k SIGZIIFICANT R", 2 0JPAM WAM3.QSW WoDUE .. G IBLY. L 00 11. DEPARTMEN -F1 "- , Philadelphia District Corps of Engineers Philadelphia, Pennsylva nia ___s __- 10 084 II 9 ...
Transcript
DISi'RIBU'l,'ii UkLIMITED. LEVEL'DELAWARE RIVER BASIN
11L LUBBERS RUNSUSSEX COUNTYNEW JERSEY
LAKE LACKAWANNADAM DTIC
~ELECTEy
NJ 00817 4 '" 9bD
__2 EJ INSPECT NEPRT !!1bN !ATIONAL' PAM SAFETY .PROGRAM.Lake Lackawanna Dam (N-.-0817)
Delaware River Basin, LubbersRun, Sussex County New Jersey.
Phase 1 Inspecion Report*
.,- FOR ,F/ 'A^[ .r "
('~ UNLMIThD.g~S DOMAENT IS BEST QUALITY P'~.IUTION U LMTDI ,c)PY UBTSIEDTO DDC CNTIM k
SIGZIIFICANT R", 2 0JPAM WAM3.QSWWoDUE ..G IBLY. L 00 11.
DEPARTMEN -F1 "- ,
Philadelphia DistrictCorps of Engineers
Philadelphia, Pennsylva nia
___s __- 10 084 II
9 ...
NOTICE
THIS DOCUMENT HAS BEEN REPRODUCEDFROM THE BEST COPY FURNISHED US BYTHE SPONSORING AGENCY. ALTHOUGH ITIS RECOGNIZED THAT CERTAIN PORTIONSARE ILLEGIBLE, IT IS BEING RELEASEDIN THE INTEREST OF MAKING AVAILABLEAS MUCH INFORMATION AS POSSIBLE.
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DISCLAIMER NOTICE
- THIS DOCUMENT IS BEST QUALITYPRACTICABLE. THE COPY FURNISHEDTO DTIC CONTAINED A SIGNIFICANTNUMBER OF PAGES WHICH DO NOTREPRODUCE LEGIBLY.
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SECURITY CLASSIFICATION OF THIS PAGE (When Data En"terwd)REPORT DOCUMEHTATIO"PAGE READ INSTRUCTIONSREPORT_______________PAGE_ BEFORE COMPLETING FORM
i. REPORT NUMBER . GOVT ACCESSION NO. 3. RECIPIENT'S CATALOG NUMBER
DTEE/OAP-53842/Jo0817-81/07o V
4. TITLE (and SubtiJl) $. TYPE OF REPORT A PL _00 COVEREDPhase I Inspection ReportNational Dam Safety Program FINAL
Lake Lackawanna Dam, NJ00817 6. PERFORMING ORG. REPORf NUMBERSussex County, NJ
7. AUTHOR(a) ". CONTRACT OR GRANT NUmBER(e)
Perera, Abraham, P.E. DACW61-79-C-0011
S. PERFORMING ORGANIZATION NAME AND ADDRESS 10. PROGRAM ELEMENT. PROJECT. TASK
Louis Berger & Associates AREA & WORK UNIT NUMBERS
100 Halstead St.East Orange, NJ 07019
I. CONTROLLING OFFICEMNAM AND ADDRESS 12. REPORT DATENJ Department of Environmental Protection July, 1981Division of Water ResourcesP.O. Box CN029 13. NUMBER OF PAGESTrenton, NJ 08625 50
14. MONITORING AGENCY NAME & ADDRESS(It gfhmt fbon CmCaotgoflh Offfcv) IS. SECURITY CLASS. (of loe s.@uI)U.S. Army Engineer District, PhiladelphiaCustom House, 2d & Chestnut Streets UnclassifiedPhiladelphia, PA 19106 154L OECLASSIFICATION/OOWNGRAOING
SCHEDULE
I6. DISTRIBUTION STATEMENT (of *do Reapi)
Approved for public release; distribution unlimited.
17. DISTRIBUTION STATEMENT (at** abeftect entemeE in loak20 I fliem ban Aapeft)
IS. SUPPLEMENTARY NOTES
Copies are obtainable from National Technical Information Service,Springfield, Virginia 22151.
19. KEY WORDS (Cmoanc teverso side It necteemp ad Iduety by bloc naebor)
Dams National Dam Safety ProgramEmbanmentsSeepageEmbankments Lake Lackawanna Dam, NJ Lubbers Run, NJ
Visual Inspection Delaware River BasinStructural Analysis Spillways
Aw- spppaup2M AWSTACT (CC&o do # ere N nacooo, a hkouib bj .ock macmo.)
-This report cites results of a technical investigation as to the dam's adequacy.The inspection and evaluation of the dam is as prescribed by the National Dam
Inspection Act, PublicLaw 92-367. The technical investigation includes visualinspection, review of available design and construction records, and preliminarystructural and hydraulic and hydrologic calculations, as applicable. Anassessment of the dam's general condition is included in the report. I
- tram JAN n 9A0,11ATW O Nov Is OBS111)LETIE
SECURITT CLASOICATION OF ThtS PACE (Muon DOCb Entsfed)
SKCUVITY CLASUPICATION OF THIS PAGE(h bW* Eemw) -
SECURITY CLASSIFICATION OP THIS PAGE41It... Daft Entfered)
22C-
PgPFAfTMgNT OF -THE ARMYPlIIALAWA DISTRICT. OPI OF Ff~hIfligEH5
C(JgiTom ji$QQl-g jV A s EISTMIT STHk!it0 r11II.AILViIA. e9#0W64I tA Iffint
AaoM tgi flu'i 1 4 JJTJ§ here* IH Af l tt~ t P ET T 11 -A'$
(2) Provide protection against wave erosion on the upstream face ofthe dam.
(3) Repair the deteriorated sections of concrete on the spilluay- wingwall and bridge soffit.
d. The owner should develop written operating procedures and a periodic
maintenance plan to ensure the safety of the dam, within one year from thedate of approval of this report.
e. An emergency action plan and warning system should be developedwhich outlines actions to be taken by the owner to minimize the downstreameffects of an emergency at the dam within six months from the date ofapproval of this report.
A copy of the report is being furnished to Mr. Dirk C. Hofman, New JerseyDepartment of Environmental Protection, the designated State Office contactfor this program. Within five days of the date of this letter, a copy willalso be sent to Congressman Courter of the Thirteenth District. Under theprovision of the Freedom of Information Act, the inspection report will besubject to release by this office, upon request, five days after the date ofthis letter,. -
Additional copies of this report may be obtained from the National Technical
information Services (NTIS), Springfield, Virginia 22161 at a reasonablecost. Please allow four to six weeks from the date of this letter for NTISto have copies of the report available.
An important aspect of the Dam Inspection Program will be the implementationof the recommendations made as a result of the inspection. We accordinglyrequest that we be advised of proposed actions taken by the State toimplement our recommendations.
Sincerely,
i-Incl ROGER L. BALDWINAs stated Lieutenant Colonel, Corps of Engineers a
Commander and District Engineer
Copies furnished:Mr. Dirk C. Hofman, PiE., Deputy Director
SDivision of Water -Res6urcesNJ. Dept. of-Environmental ProtectionP.O.-Box CN029-Trenton, NJ 08625
Mr. John- O'Dowd,- Acting ChiefBureau of Flood Plain Regulation-Division of Water RsourcesN.J. Dept. of Envirn etl ProtectionP.O. Box CN029Trenton, NJ 08625
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LAKE LACKAWANNA DAM (NJ00817)
CORPS OFENGiNEERS ASSESSMENT OF GENERAL CONDITIONS
This dam was inspected on 4 February 1980 by Louis Berger ano Associates,
Inc. under contract to the State of New Jersey. The State, under agreementwith the U.S. Army Engineer District, Philadelphia, had this inspection
A performed in accordance with the National Dam inspection Act, Public Lau92-367.
Lake Lackawanna Dam, initially listed as a high hazara potential structure.but reduced to a significant hazard potential structure as a result or thisinspection, is judged to be in good overall condition. The dam's spillwayis considered inadequate because a flow equivalent to 74 percent of the OneHundred Year Flood would cause the dam to be overtoppea. To ensure adequacyof the structure, the following actions, as a minimum, are recommended:
a. The spillway's adequacy should be determined by a qualitiedprofessional consultant engaged by the owner using more sophisticatedmethods, procedures and -studies within six months from the date of approvalof this report. Within three months of the consultant's findings remedialmeasures to ensure spillway adequacy should be initiated.
b. Within three months from the date of approval of this report thieowner should initiate a program -to monitor the seepage in the swale at thedownstream toe near the left abutment to determine the source of the seepageand any necessary remedial measures.
C. Within twelve months from the date of approval of this report thefollowing remedial actions should be initiated:
(1) The brush and trees on the embankment should be removed and theeroded areas filled and seeded.
(2) Provide protection against wave erosion on the upstream face ofthe dam.
(3) Repair the deteriorated sections of concrete on the spillwaywingwall and-bridge soffit.
d. The owner should develop written operating procedures and a periodicmaiftenance plan- to ensure the safety of the dam, within one year from thedate of approval of this report. -2
e. An emergency action plan and warning system should be developedwhich outlines actions to be taken by the owner to minimize the downstream-effects of an emergency at the dam within six months from the date ofapproval of this report.
APPROVED: _____________
ROGER L. BALWIN
Lieutenant Colonel, Corps of EngineersCommander -nd District Engineer
_ DATE: -27 44 ,
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PHASE I REPORT
NATIONAL DAM INSPECTION PROGRAM
Name of Dam Lake Lackawanna Dam Fed ID# NJ 00817
State Located New JerseyCounty Located Sussex
__ Coordinates Lat. 4056.8 - Long. 7442.1Stream Lubbers RunDate of inspection February 4, 1981
ASSESSMENT OFGENERAL CONDITIONS
Lake Lackawanna Dam is considered to be in generally goodoverall condition although its spillway capacity can accom-modate only 73% of the 100-year design flood. It is recom-mended that the hazard classification be changed to signi-ficant since there are several homes and a road bridgedownstream that could sustain damage in the event of a damfailure. Since the spillway capacity is inadequate, moreprecise hydraulic and hydrologic analyses should be under-taken to determine the need for, and type of, mitigatingmeasures required. It is further recommended that the swaleat the downstream toe near the left abutment be monitored todetermine the source of the seepage. Other remedial meas-ures to be undertaken in the future include the repair ofthe concrete at the spillway, removal of brush and treesfrom the embankment, repair of the eroded areas on theembankment, and the provision of riprap or other waveprotection between the dock and spillway on the upstreamface of the dam. It is further recommended that the ownerdevelop a periodic maintenance program, an emergency actionplan, and a warning system to reduce the downstream hazard
IZL potential.
Abraham Perera P.E.Project Manager
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MVI
TABLE OF CONTENTS
PageU
Assessment of General ConditionsOverall View of DamTable of Contents
Figure 1 - Regional Vicinity MapFigure 2 - Plan of DamFigure 3 - Spillway and Wall Sections
APPENDIX
Check List - Visual Inspection i-viii 2Check List - Engineering Data ix-xii
PhotographScheck List - Hydrologic and Hydraulic Data Al-AI4
Computations
PREFACE
This report is prepared under guidance contained in theRecommended Guidelines for Safety inspection of Dams, forPhase I investigations. Copies of these guidelines can beobtained from the Office of Chief of Engine-ers, Washington, D.C. 20314. The purpose of Phase I investigations is toidentify expeditiously those dams that may pose hazards tohuman life or prooertv. The assessment of the generalcondition of the dam Is based on available data and visualinspections. Detailed investigation and analyses involvingtopographic mapping, subsurface investigations, testing, anddetailed computational evaluations are beyond the scope of aPhase I investigation; however, the investigation isintended to identify any need for such studies.
In the review of this report, it should be realized that thereported condition of the dam is based on observations offield conditions at the time of inspection along with dataavailable to the inspection team. It is important to notethat the condition of a dam depends on numerous and con-stantly changing internal and external conditions-and isevolutionary in nature. It would be incorrect to assumethat the present condition of the dam will continue torepresent the condition of the dam at some point in thefuture. Only through continued care and inspection canthere be any chance that unsafe conditions will be detected.
Phase I inspections are not intended to provide detailedhydrologic and hydraulic analyses. in accordance with theestablished guidelines, the spillwav test flood is based onthe estimated Oprobable maximum flood" for the region(greatest reasonable possible storm runoff) or fractionsthereof. The test flood provides a measure of relativespillway capacity and serves as an aid in determining theneed for more detailed hydrologic and hydraulic studies,considering the size of the dam, its general condition, andthe downstream damage potential.
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PHASE I INSPECTION REPORTNATIONAL DAM INSPECTION PROGRAM
NAME OF DAM: LAKE LACKAWANNA DAM FED# NJ 00817
SECTION 1 - PROJECT INFORMATION
1.1 GENERAL
a. Authority
This report is authorized by the Dam InspectionAct, Public Law 92-367, and has been prepared inaccordance with Contract FPM-36 between LouisBerger & Associates, Inc. and the State of NewJersey and its Department of EnvironmentalProtection, Division of Water Resources. TheEl State, in turn, is under agreement with the U.S.Army Engineer District, Philadelphia to have thisinspection performed.I b. Purpose of Inspection
The purpose of this inspection is to evaluate the
structural and hydraulic condition of the LakeLackawanna Dam and appurtenant structures and todetermine if the dam constitutes a hazard to humanlife or property.
1.2 DESCRIPTION OF PROJECT
_ a. Description of Dam and Appurtenances
_Lake Lackawanna Dam consists of a 224-foot-longearth embankment with an 86-foot-long concretespillway at the right abutment. The embankmenthas a 3H:lV downstream slope, a crest width of 10feet, and a 5-foot-wide concrete sidewalk and curbextending to the left abutment. A wooden deck hasbeen constructed adjacent to a concrete headwallstructure for the 40-inch-diameter steel drainpipe. A 6.5-foot-wide concrete bridge extendsacross the spillway at the centerline of the dam.The bridge is supported on three concrete piers,each of which is 2.67 feet wide. A concrete ogeewe.r located 10 feet upstream from the bridge
wdischarges down a concrete apron to a 6-inch-highsill located 7 feet below the weir and 3 feet
_ upstream of the bridge. The sill contains four18-inch-wide notches placed to coincide with thecenter of the spillway channels between the bridge
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- piers. The clear opening between each pier beneath
the bridge is 6.4 feet high by 19.5 feet wide.Downstream of the bridge the spillway empties intoa bedrock channel at a point about 50 feet from theogee weir.
b. Location
The dam is located on Lubbers Run approximately6,650 feet northeast of the intersection of Route206 and Lackawanna Drive in Byram Township, Sussex =
County, New Jersey. Access to the dam is possible =
via Route 206, Lackawanna Drive, Heminover Street,and Richmond Road.
c. Size Classification
The dam at Lake Lackawanna has a maximum height of14.6 feet and a maximum storage capacity of 988acre feet. Accordingly, this dam is in the smallsize category as defined by the criteria in theRecommended Guidelines for Safety Inspection ofDams (storage less than 1,000 acre-feet and heightless than 40 feet).
d. Hazard Classification
The dam is located in a sparsely developed valleyin rural Sussex County. There are, however, newhomes being built in the Lake Lackawanna communitydownstream of the lake. Several of the homes arewithin 150 feet of the stream channel, and whilethey appear to be located several feet above thestream channel, it is possible they could sustainsubstantial flood damage in the event of a damfailure. Moreover, Heminover Street, a small localroad serving the east half of the lake community,crosses over the stream channel about 225 feetdownstream from the dam. Communication with Mr.
WDavid Rush, a representative of the owner, indi-cates that the Heminover Street bridge and roadwayhave been overtopped in the past uring hurricanes,with no apparent damage to eithe structure. How-ever it is believed that the flood wave created bya dam failure could cause serious damage to boththe bridge and other downstream structures and pos-sibly result in t:.e loss of a few lives. Accord-
-: ingly, it is recommended that this dam be placed inthe significant hazard category.
e. Ownership
The dam is owned by the Lake Lackawanna InvestmentCo. who may be contacted through David Rush, 36Richmond Road, Stanhope, l..J.
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f. Purpose of Dam
The purpose of the dam is recreation.
g. Design and Construction History
No information is %ailable regarding the design ofthe dam although it was built around 1954.
h. Normal Operating Procedures
Operating procedrres t the dam consist of loweringthe lake every tiiird yea to repair docks and per-form routine maintenance on tne dam, its spillway,and the intake to the lw level drain. Periodicmaintenance, consisting of debris removal and minorrepair work is performed twice a year by members ofthe lake association.
1.3 PERTINENT DATA
a. Drainage Area
Lake Lackawanna Dam has a drainage area of 13.2square miles, which consists primarily of sparselydeveloped woodlands.
b. Total spillway capacity at maximum pool elevation
is 2,745 cfs.
c. Elevations
Top of dam - 716.6Spillway crest - 712.5Streambed at centerline of dam - 702.0
d. Reservoir
Length of maximum pool
(top of dam) - 4,900
Length of recreation pool(spillway crest) - 4,500
e. Storage (acre-feet)
Top of dam - 988Recreation pool - 410
f. Reservoir Surface (acres)
Top of dam 166Recreation pool - 114 F
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g. Dam
Type - Earth with concrete spillway at rightabutment
Length -310 feet
Height- 14.6 feet
Top width- 10 feet
Side slopes - 3H:lV downstream; upstreal slopeunknown
Zoning - Unknown
Impervious blanket - Unknown
Corewall - Unknown
Cutoff - Unknown
Grout curtain - Unknown
h. Diversion and Regulating Tunnel - None
i. Spillway
Type - Concrete ogee weir at right abutment
Weir length - 86 feet
Gates - None
U/S channel - None
D/S channel - Concrete lined, 21-foot-long posi-tively sloped channel that steps down1.25 feet to a natural, bedrock-linedchannel.
j. Regulating Outlets
A 40-inch-diameter gate operated C.I.P drain islocated at the junction of the embankment and theleft Abutment of the spillway. The pipe extendsfrom a concrete headwall on the upstream side of
__ the embankment diagonally through the spillwaysidewall and empties into the spillway channeldownstream of the concrete foot bridge at outletinvert elevation 704.0.
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SECTION 2 - ENGINEERING DATA
2.1 DESIGN
No information was available regarding the DamApplication, design details, or details of thedam's construction. The NJDEP does not havemicrofilm records of this structure or a DamApplication number.
2.2 CONSTRUCTION
Although details pertaining to the construction ofthe dam were not available, information pertainingto the geology of the area was obtained from theGeologic Map of New Jersey and the Rutgers Engi-neering Soil Survey of Sussex County.
The dam is located in a narrow bedrock valley thatis overlain by glacial drift and alluvium. Theoverburden consists of silty sands and gravels withan appreciable number Of cobbles and boulders. Thebedrock Underlying the dam is Pre-Cambrian Loseegneiss, a hard, dense granitoid that exhibits awell-deveioped joint system. The bedrock is at theground surface immediately downstream of the spill-way.
2.3 OPERATION
There is no information available pertaining toformal dam operations. However, since the solepurpose of the dam is the impoundment of a lake forrecreational purposes, the spillway appears ade-quate to perform, unattended, the water level reg-ulation function at the dam.
2.4 EVALUATION
a. Availability
No design or construction information was availableto the inspection team. The dam evaluation wasbased on geotechnical information available in thegeneral literature of this area, field observa--tions, and measurements made at the dam site.
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b. Adequacy
Although none of the original design data wasavailable for review, field observations and aliterature review yielded sufficient information tovevaluate this dam within the purview of PL 92-367.
c. Validity
There are no engineering data available for evalu-ation.
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SECTION 3 - VISUAL INSPECTION a
3.1 FINDINGS
a. General
Visual inspection of Lake Lackawanna Dam was per-formed on February 4, 1981, at which time about aninch of water was passing over the weir. The damappears to be in a generally good condition, al-
though the downstream embankment needs some cosme-tic landscaping.
b. Dam Al
The dam's embankment is in fair condition althoughit exhibits some signs of neglect. Heavy brush andseveral trees were observed on the downstream face,and debris and garbage litter the backslope and thearea immediately downstream. Minor erosion wasnoted at the center of the downstream slope andalongside the left wingwall of the spillway. While
the vertical alignment of the crest is generallygood, the upstream face of the embankment is some-what irregular due to the establishment of a sandybathing beach near the left abutment and the con-struction of a deck area near the gate structure ofthe outlet pipe on the upstream face. Wave actionis funneled between the deck and the concrete wallsadjoining the spillway, increasing the wave erosionat that point. Dampness was observed along thedownstream toe, extending from the left abutmenttoward the center of the dam. A 75-foot-longdrainage swale is located in this area and thewetness could be due to surface runoff from theabutment area rather than from seepage throughthe dam.
c. Appurtenant Structures
The spillway weir and side walls are in generallygood condition, although some concrete spalling wasnoted at the downstream end of the right sidewall.Minor spalling was also observed at the soffit ofthe bridge arch nearest to the embankment. Theoutlet pipe also appeared in good condition as didthe gate valve and headwall structure, although thewheel was missing from the gate stem. Removal ofthe wheel to prevent vandalism and unauthorizedlowering of the lake is a common practice.
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d. Reservoir
The lake is bounded on the west by relativelysteep, wooded slopes. Almost the entire perimeterof the lake is developed with small summer and yearo round residences. Recent development is most heavyto the east and south of the lakes, where the ter-rain is flatter and more conducive to contemporarydevelopment norms. Ice precluded a thorough in-spection of the upstream portions of the dam belowthe water line but there does not appear to be asignificant build-up of sediment in front of thespillway. This could be due to the fact that DallisPond at the upstream end of Lake Lackawanna acts asa sediment trap, reducing the amount of siltationin the lower lake.
e. Downstream Channel
Discharge from the spillway flows down a naturalbedrock, stone-laden channel to a road bridge about225 feet beyond the toe of the dam. The opening ofthe bridge is 5 feet by 18 feet, and it would pre-sent a constriction to very heavy flows until theroad adjacent to the bridge is overtopped. Thechannel gradient and side slopes flatten out about1,300 feet downstream of the dam since the valleywidens into a large swampy area, which extends toRoute 206. Several recently built houses arelocated within 150 feet of the stream channel lessthan 1,000 feet downstream of the dam.
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SECTION 4 - OPERATIONAL PROCEDURES
4.1 PROCEDURES
The dam functions essentially without regulationthroughout the year. Every third year the ownersget permission from the State Fish and Game Divi-sion to lower the lake for maintenance and dockrepairs. The lake level remains down until repairsare completed, at which'time the lake is left torefill to normal pool elevation. No other opera-tional procedures are practiced as a matter ofroutine# however, members of the association areavailable to lower the lake level should extraordi-nary circumstances dictate such an action.
4.2 MAINTENANCE OF DAM
Maintenance of the dam and spillway is performedtwice a year by members of the lake association.This work is generally limited to light landscapingand debris removal from the embankment, spillway,drain inlet, or downstream channel. When more ex-tensive remedial work is required, the associationengages the services of outside contractors spe-cializing in the necessary types of repairs.
4.3 MAINTENANCE OF OPERATING FACILITIES
As indicated above, maintenance of the drain isusually performed by members of the lake associa-tion. At present, this work is generally limitedto cleaning debris and Silt from the entrance andwithin the low level drain, lubricating and check-ing the operation of the gate valve every thirdyear, and inspecting visible portions of the pipefor obvious defects or conditions requiring re-pairs.
4.4 DESCRIPTION OF WARNING SYSTEM IN EFFECT
No formal warning system exists at the dam, a!-though members of the association make periodicinspections of the dam and spillways.
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4.5 EVALUATION OF OPERATIONAL ADEQUACY
In view of the limited requirements placed on theregulatory facilities at the dam, the existingoperational procedures are considered satisfactory.
V The employment of a regular periodic maintenanceprogram is considered laudable, although it is feltthat the association should direct more attentiontoward removal of the excessive growth on the damembankment.
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SECTION 5 - HYDRAULIC/HYDROLOGIC
5.1 EVALUATION OF FEATURES
a. Design Data
Pursuant to the Recommended Guidelines for SafetyInspection ofoDams, Lake Lackawanna Dam is a smallsize and significant hazard dam. Accordingly,- -e100-year frequency storm was chosen as the designflood by the inspecting engineers. Inflow to the
reservoir for the selected storm was computed bythe HEC-I computer program utilizing precipitationdata from Technical Paper 40 and Technical Memo-randum MIS HYDRO-35, which gave a peak inflow of4,616 cfs. Routing this storm through the reser-voir reduced the peak discharge to 3,818 cfs.Because the spillway capacity is 2,799 cfs, it canonly accommodate 73% of the 100-year storm and istherefore inadequate.
b. Experience Data
There are no streamflow records available for thissite nor have records been kept regarding the dam'shydraulic performance since its construction.
c. Visual Observations
There is no evidence of recent problems. The lakelevel was at normal pool elevation at the time ofinspection. Although the surface of the lake wasentirely frozen, water was flowing over the weir.
d. Overtopping Potential
Employing the discharge and spillway capacitiescontained herein, the dam would be overtopped by0.84 feet in the event of the 100-year frequencystorm. However, there are no records or indica-tions that the dam has ever been overtopped.
e. Drawdown
A 40-inch gate-controlled steel pipe is available
for drawdown to elevation 705.5 NGVD. Draw down
can be accomplished in approximately 5.6 days. _7
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SECTION 6 - STRUCTURAL STABILITY
6.1 EVALUATION OF STRUCTURAL STABILITY
a. Visual Observations
No deficiencies of a structural nature were notedduring the inspection of this dam. The crest isuniform in a horizontal plane and the height-to-width ratio is conservatively modest (1.4:1). Noindications of mass movement of material, such assettlement, sloughing, or cracking, were noted.
b. Design and Construction Data
As indicated in Section 2, no information is avail-able regarding the design or construction historyof the dam. However, field observations reveal thedam is well built and conservative in design. Al-though the composition of the dam is unknown atpresent, the condition of the appurtenances isquite good, indicating a well supervised construc-tion utilizing select materials throughout.
c. Operating Records
While no formal operating records are maintained bythe lake association, the dam appears to have per-formed satisfactorily since its construction.
d. Post Construction Changes
The only modification at the dam appears to be theaddition of a deck and bathing area on the upstreamface, neither of which affect the structural integ-rity of the dam.
e. Seismic Stability
Lake Lackawanna Dam is located in Seismic Zone 1,where seismic activity is slight and additionalstructural loading imparted thereby is generallyinsignificant. Experience indicates that dams inZone 1 that are stable under static loading condi-tions will maintain their structural integrity whensubjected to the negligible dynamic loads imposedby the weak seismicity characteristic of this area°.As indicated in the preceding paragraphs, this damis considered stable under the existing staticconditions.
Subject to the inherent limitations of the Phase Ivisual inspection, Lake Lackawanna Dam is judged tobe in a good overall structural condition. However,the spillway is capable of accommodating only 73% Iof the 100-year frequency design flood. Some dam
overtopping could be tolerated without seriousconsequences because of the low height of the dam,its high crest width-to-height ratio, and the factthat the embankment has 5-foot-wide concrete side-walk pavement extending along, and protecting, itsentire crest. it is recommended that this dam beplaced in the significant hazard category because adam failure could result in substantial damage toseveral residences and a road bridge downstream aswell as the possible loss of a few lives.
b. Adequacy of Information
With the exception of visual observations, no in--form.tion was available for use in assessing thisdam. However, based on the good condition of thedam, it is felt that the inspection provided suf-ficient information with which to perform a~cogentevaluation.
c. Urgency
Implementation of the recommendations pertaining toroutine maintenance may be undertaken in the fu-ture. However, it is felt that monitoring of theseepage near the left abutment should begin verysoon.
d. Necessity for Further Study
Since the spillway cannot accommodate the designstorm, it is-recommended that more precise hvdro-logic and hydraulic analyses be performed to deter-mine the need for and type of mitigating measurest_ that may be necessary.
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7.2 RECOMMENDATIONS/REMEDIAL ACTIONS
a. Recommendations
It is recommended that monitoring of the seepagebegin very soon to determine the remedial actionrequired. The studies to be undertaken in thefuture should include additional hydraulic andhydrologic investigations to refine the magnitudeof the design flood and spillway calculations. Itis further recommended that the brush and trees onthe embankment be removed and the eroded areasfilled and seeded. Protection against wave erosionshould be provided on the upstream face of the dam,and the deteriorated sections of concrete on thewingwall and bridge soffit should be repaired.
b. O&M Maintenance and Procedures
The owners should develop a periodic maintenanceplan and establish routine operating procedures forthe dam. These procedures should include periodicoperation Of the blowoff valve to ensure its proper
functioning and keep the intake area free of exces-sIve siltation. The owners should also create anemergency action plan and downstream warning systemto minimize the potential for flood damage down-stream.
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February, 1981
View of Dam C res t
-W
February, 1981
View o. swimming Dock -
~ -01
__ ~----777
- - February, 1981View of Spillway Bridge and Outlet Pipe
1A 1!
february, I1981View of Ogee Weir and Sill Notch
All
Febriary, 1981
Erosion At Upstream Embankment
AIM-
February, 1981
View of Outlet Pipe
February, 1981Downstream View of Spillway
February, 1981View of Downstream Channel from Dam
C11ECX LIS_HYDROLOGIC AND HYDRAULIC aATA
EGINEERING DATA
DRA INAGE AREA CHARACTERISTICS: 13.2 square miles
ELEVATION TOP NORNAL POOL (STORAGE CAPACITY): 712.5 (410 acre-.~feet)
ELEVATI0.' TOP FLOOD CONTROL POOL (STORAGE CAPACITY): -
ELEVATION MAML~1 DESIGN POOL: -
ELEVATION TOP MY: 716.6 Z988 acre-feet)
CREST: Spillway
a. Elevation 71.b. Type Oaee weirc. Width 2.5 feetd. Length 86 feetLe. Location Spillover Riqht abutmientf. Number and Type of Gates None
OUTLLET WORKS: Gate operated low level drain
a. Type40" diameter C.I. pipeb. Location~ Junction embanlanent and spillwayc. Entrance inverts 705.5d. Exit inverts 704.0e. Emergency draindown facilities San
HDRO.1TEOROLOGICAL GAGES: None
a. Typeb. Locationc. Records ___________________________
MhXBDVUN NON-DAMAGIN DISCHARGE-..2 '799 cfs
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