EEEEEEEEEIIIJEEi DAM SAFETY PROGRAM. LAKE ASHROE DAM … · NATIONAL DAM SAFETY PROGRAM. LAKE ASHROE DAM (NJOOC23) ... I , Iowing remedial actions should be initiated withio twelve

F AIOO 81 NEW JERSEY DEPT OF ENVIRONMENTAL PROTECTION TRENTON -ETC F/6 13/13NATIONAL DAM SAFETY PROGRAM. LAKE ASHROE DAM (NJOOC23)- DELAWAR--ETC(u)MAR 81 P K YU DACW61-g79-C-0011

NCLASSIFIED DAEN/NAP-53842/NJOO-023-81 NLEEEEEEEEEIIIJEEiEIIIIIIIIIIIIu

EELUikIIL

DELAWARE RIVER BASIN/BRANCH OF BIG FLAT BROOK

SUSSEX COUNTYNEW JERSEY

* 0

I LAKE ASH ROE DAMDT

t,4JUN2319

PHASE 1 INSPECTION REPORT E

NATIONAL DAM SAFETY PROGRAM

ROVED FOR PUBLIC REL ;TRIBUTION UNLIMITED.

'r ."me '. :,;T 13 R7,ST 0'1. T TYi PRACTICipT 1p"M 1"z"A

.W iRODtUCE ZEGIL Yjrk¥ - -----

DEPARTMENT OF THE ARMYPhiladelphia DistrictCorps oF Engineers

* Philadelphia, Pennsylvania

MARCH 1981-- - - - _--- _------: _-

6 1 6- 22 015.. .........-.. '- -, - - --. --,,-. ....

DISCLAIMER NOTICE

THIS DOCUMENT IS BEST QUALITYPRACTICABLE. THE COPY FURNISHEDTO DTIC CONTAINED A SIGNIFICANTNUMBER OF PAGES WHICH DO NOTREPRODUCE LEGIBLY.

.l

.,..-

SECURITY CLASSIFICATION OF THIS PAGE (Whoi Date Entered)

REPORT DOCUMENTATION PAGE BREA ONUCTOSBEFORE COMPLETIG FORM

. REPORT NUMBER 2. GOVT ACCESSION NO 3. RECIPIENT'S CATALOG NUMBER

DAEN NAP-538421NJO0023-81103 -'lo 1 *t 1 >4. TITLE (and Subtile) S. TYPE OF REPORT & PER4O0 COVERED

Phase I Inspection ReportNational Dam Safety Program FINALLake Ashroe Dam w- .0 00 2 6 S. PERFORMING ORG. REPORT NUMBER

Sussex County, NJ

7. AUTHOR(s) S. CONTRACT OR GRANT NUMBEft(e)

DACW61-79-C-0011Yu, K. Peter

S. PERFORMING ORGANIZATION NAME AND ADDRESS 10. PROGRAM ELEMENT, PROJECT. TASKAREA 6 WORK UNIT NUMBERS

Langan Engineering Assoc.990 Clifton Ave.Clifton, NJ

I 1. CONTROLLING OFFICEN AMI ANtU ADDRES 12. REPORT DATENJ Department o tEnvironmenta1 Protection March 1981Division of Water Resources March_1981

P.O. Box CN029 1s. NUMBER OF PAGESTrenton, NJ 08625 6014. MONITORINC AGENCY NAME & AOORESS('I dtiffert from Controllin Office) iS. SECURITY CLASS. (of thi report)SU.S. Army Engineer District, PhiladelphiaCustom House, 2d & Chestnut Streets UnclassifiedPhiladelphia, PA 19106 15a. DECLASSIFPICATION/ DOWNGRADING

SCHEOULE

16 DISTRIBUTION STATEMENT (of Ohio Rpowr)

Approved for public release; distribution unlimited.

17. DISTRIBUTION STATEMENT (of the abstract antee in Block 20, If dIfferent fom Report)

a 1 I& SUPPLEMENTARY NOTES

Copies are obtainable from National Technical Information Service,Springfield, Virginia 22151.

I. KEY WORDS (Contime ,n rovere ld If necoemy and Identify by block number)

Dams National Dam Safety Program

F~nbankments Lake Ashroe Dam, NJiual Inspection OuLlet worksructural Analysis

lAsi s Spillways

This rq7port 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 DamInspection Act, Public Law 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.-

SECURITY CLASMFICATION OF THIS PAGE (When Data Entered)

NOT I CE

THIS DOCUMENT HAS BEEN REPRODUCED

FROM THE BEST COPY FURNISHED US BY

THE SPONSORING AGENCY. ALTHOUGH IT

IS RECOGNIZED THAT CERTAIN PORTIONS

ARE ILLEGIBLE, IT IS BEING RELEASED

IN THE INTEREST OF MAKING AVAILABLE

AS MUCH INFORMATION AS POSSIBLE.

! I I I I tl J !! ! I I I

-S.--

i . 1I l! _ , iT •. . .U - t

DEPARTMENT OF THE ARMYPHILADELPHIA DISTRICT. CORPS OF ENGINEERS

CUSTOM HOUSE-2 D & CHESTNUT STREETS - -

PHILADELPHIA. PENNSYLVANIA 19106 strit t

..,,L,.,,.vo IIN REPLY REFER T0 List ISei'

NAPEN-N cK5

Hlonorable Brendan T. Byrne 2 9 MAY 1981Governor of New JerseyTrenton, New Jersey 06621

Dear Governor byrne:

Inclosed is the Phase I l!Isp,.ctLio ReporL for Lake A6hroe Dam in SussexCounty, New Jersey which ha,; been prepar(.o, under authorization of the DamInspection Act, Public Law' 92-3b7. A brief assessment ol the dam'scondition is given in thet iront O the rep.jrt.

Based on visual inspect ion, vvaiLable rec uru s, ¢alcuL ions and past

operational pr tormance, Lake Asitroe Dam, initially Listed as a high hazardpotential structure, but reduced to a signii-icant hazara potential structureas a result ot this inspection, is judged to be in fair overali condition.'iAe dam's spilway is considered i2aodequale because a flow equivalent to 15percent of the Probable Maximum Flood would cause the dam to be overtoppea.To ensure adequacy of tLe str!A ture, the following actions as a mninimum, arerecommended:

'flhe spiliway s adequacy should be determined by a qualifiedprotessional coisultant engaged by the owner using more sophisticatedmethods, procedurts 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. With, in six tmonths from toe date of approval of this report tn,.ollowing remedi al actions should be initiated:

0) Investigate the operatting condition ol the low level outlet andrepair it necessary.

(2) Dcet.rmine the d rawdown capacity of the 12 inch uianieter pipeusin),g more precise procedures 'ind increase drawdown capability it necessary.

c . t'l i , I , Iowing remedial actions should be initiated withio twelvem,uths from thc date )i approval of this report:

(1) L tar vg etation downs tream of the urop out let pipe to provideaII 1n st ructoou aehrcha nnel,

(2) L V1U0t L 0 hydraUi e[ ci fect o LI Strubie Road causeway onLn1C kIII and mod ly the a nseway it tiucessary.

NAP EN-NtHCouorable Bre ndan i. bvtine

(3) Consider providing emergency spillway facilities.

(4) Perform audit ional investigation to deters~liiic tik engin-eringproperties of the dam and foundation and whether or not conventi iotnl safetymargins exist under more severe stress condLtiolm. than those obscrveu duringthe inspection, and what modifications may be requir,, to achieve suchsafety margins.

d. The owner should develop written optrating proccdur,-s and a periodicmaintenance plan to ensure the saIety o! the dam wittin one year from thedate of approval o tihi., report.

e. An emergency action plan should b,: developed wrticit outlines actionsto be taken by the owrcr to minimize the downstream Citectt; ot an emer;,encyat the dam within six months front Lhi. date of approval U1 th;- report.

A copy of the report is ,eing furnished to Mr. Dirk C. Hoifaan, New JerseyDepartment of Envi. onm-ental Protection, the designated State Office contacttor this program. Within five days of the date oi tnis letter, a copy willaL3o be sent to Congressman Coarter ot the Thirteenth District. Under the

provision of the Fieedom of Information Act, the inspection report will besubject to release by this office, upon request, five days att(-fr the date of

this letter.

Additional copies of this ieport may be obtained front the National Technicalinformation Survices (NTIS), Springfield, Virginia 22)6l at a reasonablecost. Please allow four to six weeks from the date of this letter for NiiSto have copies of the report available.

An important aspecL of the Darn lo-pection Program will be the implementationof the recoutscitdaLio',a made as a result of the inspection. We accordinglyrequest that w'e be advised of proposLd actions taken by the State toimplement our recommndations.

Sincerely,

I nc KENNIti'H R. MOSERAs stated Major, (orp, of Engineers

Act.ipg District Engitier

Copies furnished:Mr. Dirk C. iio~man, P.E., Del.tty D)rectorDivision of Water ResourcesN.J. Dept. of Environmental Protection

i 'P.O. Box CN029Trenton, NJ 08625

Mr. John O'Dowd, Acting ChiefBureau of Flood Plain Regul tionDivision of Water Resources

N.J. Dept. of Environiental ProtectionP.O. Box CN029Trenton, NJ 08625

Spy ~ ~ ~-ii~.i x-

i..Ut~i' oF- LNu. I NEERS ASSi. SSMFN i ()I- GENE'RAI. CON! I I)NS

Tnis (lam was inspec ted on h September ano iDciL I (i boetu 1u h\LariigatFlngineering Associates, [inc. , under contr1aCt. LO the StaLLt oi Net, Jersey.1lhe St ate, uitdc r ag r ve:entL with LtIuL L, . S3. A rmy t~i. t: I IstrictPI'll adelphia, had this inspect ion purtoriu lin accoro1iCt, with tilt Nat ieiiitiI,i. Inspect ion Act, Puol ic Law 92-31)7.

Laike AshroC bart, iitially listLO as a high hazaro pUuLt-itl SLIstuCture, butreduced to d S1611t III cntiazatd potent tit I stCruc turt 'IS If It, t lth LI iIn11SPect 10n, is judi~lnd Lv Ile in lair eCIl i CoitdiLil. 'ItI( klails ;p Illwayis cons ide rea I iiaueqoia Le beUe i a t I 11 w eq U i. I llnt Lo I) percet- LQ LticProbab Ie Max imum Fi ooa wati I A JU-Se took daml to be' 0VerI'j!)t d. lo elisuicuoit-qtiacy at [Ilk ,.Lructurk', t. iw Iil,- acL i:; I:, ai 1: I IIIin i, it Y,

rt. c ommninIdd:

a. 1he S i I) Jy I S aacq ac' kli (11CL , k iIt I, 'roi t Lu, i ic b (I ui I t

protess iona I conlsuiItlt t,1 eni(ed y Lilt Owt~ s Iot u s it 1101 SI IC tcatuL

meth od s, pr o ced ures aind stLud ic (.' ' Lh Ir! ,I ilox L Itns t roL) t L i:u date ot a 1p)r ()v.1ol nis report. Within llt iitht, cl hk. consuIt anl L L inulwgs trei'ld tciiml-'aStires to endirt z~I wzjv doi YSIn:LAl [It' In11t aicl.

b. Within s 1... it oiLh I t r , 1-4 OL' (;itt 4,1 ;i royal i 1. ,is r Ir L tIlt

t1 lOw int rrueu i;1 ,ct tIl(ls sh u Ic ik: I i -

2) lit. t e [riti tic the t1iWdo(wit up~tc LI.' y l i t I. I itch dijitt p p vt1 b nig me r. prec I st pro.) d(u rt-S alia intc I sc_ d rawdown c a pat' I t L it nkuc es s.ary.

C . Ie lv- II)i Lowin 1 re", v tiud i a ac t oi:: i lo I J he t: It. k wIth iIIt t-Il.It1 n11t si Uto t!, I tC Ott'-, a Iiro~val o I this rt S

( i) Cca~r vcgetart jn iowiist~-eam tt th urvip otitt ipej to proviaean otiobs tr uc Leo i chajrge c:1'aitne I

Z) EV.6 1tiat theL11( itya(Irau I ic k, i CC t nI thc Strut it, Roa u causeway ontnhe ialta a i MOO i y t 11 c C ns t wa i W1 I t I I ' ks Sa -r

(3 ) Cons ider provioltiq uiir t'z y , -p ii it) Lac i I i L es.

(4) Per lorm add it i ont I invet ii gat ion to dt terilte the engineeringpropert ies ut the udsm atu i touttuat iol ndwilt Lilt or not. convent tonal safetymargins exist under more severe -trebs conidit ions thanl L,-ou Observed duringthe i nspe c t ion, and wf if * 11oo 1 1 t L Oits may b kr cq i rucn( t o ach ieve s uco

A satety margins.

d . Thle owner sticuid aeve lop' wr i ttun cit our.,iL I ig proccutres and a period ic-ilain tenance plan to enso rk Lilt- bat eLy (it tie' daill W i thit oeie year i.root thedate ot appruval Ut L-ils n-plort.

e. An emergency actioni plon hout bt devCipked which outlines actions

to be taken by the owner to minimize thv uownstream eftects of an emergency

at the dam within six months from tch,- dat ot approval ut this report.

APP Rh ):KENNETH R. MOSERMajor, Corps of Engineers

Acting District Engineer

DATE:

tr,|

4q

.. . , . , ",- 7 ",

-" l i i l i

PHASE I INSPECTION REPORT

NATIONAL DAM SAFETY PROGRAM

NAME OF DAM: LAKE ASHROE DAM

ID NUMBER: FED ID No NJ 00023

STATE LOCATED: NEW JERSEY

COUNTY LOCATED: SUSSEX

STREAM: BRANCH OF BIG PLAT BROOK

RIVER BASIN: DELAWARE

DATE OF INSPECTION: SEPTEMBER 1980

ASSESSMENT OF GENERAL CONDITIONS

Lake Ashroe Dam, classified as having significant hazard potential, is lessthan 9 years old and in fair overall condition. The dam appeared stable underconditions existing at the time of our inspection. However, inadequateengineering data is available to assess the actual degree of stability of the damand appurtenances. Additional investigation is necessary to adequately evaluatethe future performance of the dam.

The spillway capacity as determined by the Corps of Engineers Screeningcriteria is inadequate. The dam can adequately pass only 14% of the PMF.

The following are recommended to be done soon:

Investigate the operating condition of the low level outlet and repair ifnecessary. Determine the drawdown capacity of the 12-in diameter pipe usingmore precise procedures and increase drawdown capability if necessary. Developwritten operational procedures to ensure the safety of the dam.

The following are recommended to be done in the near future:

Clear vegetation downstream of the drop outlet pipe to provideunobstructed discharge channel. Evaluate the hydraulic effect of the StrubleRoad causeway on the dam; modify the causeway if necessary. Provideemergency spillway facilities. Perform additional in iestigation to determine theengineering properties of the dam and foundation; whether or not conventionalsafety margins exist under more severe stress conditions than those observedduring our inspection, and what modifications may be required to achieve such

4 safety margins.

~,ASE I K. Peter Yu, P.E.

.4' iA ~.O'V (N

II

PHASE I INSPECTION REPORT

NATIONAL DAM SAFETY PROGRAM& ,-".

NAME OF DAM: .U LAKE ASHROE DAM

ID NUMBER: N'e W 6 1 Pk FED ID No NJ 00023

STATE LOCATED:= T NEW JERSEY

COUNTY LOCATED: ) SUSSEX

STREAM: BRANCH OF BIG FLAT BROOK

RIVER BASIN: DELAWARE

DATE OF INSPECTION: SEPTEMBER 1980

i"I9

LANGAN ENGINEERING ASSOCIATES, INC.

Consulting Civil Engineers

990 CLIFTON AVENUECLI FTONNEW JERSEY

201 -472-9366

/ it

CONTENTS

NATIONAL DAM SAFETY REPORT

LAKE ASHROE DAM FED ID NO NJ 00023

PAGEPREFACE

SECTION I PROJECT INFORMATION

1.1 General 11.2 Project Description 11.3 Pertinent Data 3

SECTION 2 ENGINEERING DATA 5

SECTION 3 VISUAL INSPECTION 6

SECTION 4 OPERATIONAL PROCEDURES 6

SECTION 5 HYDRAULIC/HYDROLOGIC 6

SECTION 6 STRUCTURAL STABILITY 7

SECTION 7 ASSESSMENT, RECOMMENDATIONS/REMEDIAL MEASURES 8

7.1 Dam Assessment 87.2 Recommendations/Remedial Measures 8

FIGURES 1. Regional Vicinity Map

2. Damsite & Lake Area

3. Plan & Profile of Dam

4. Details

APPENDICES I. Check List - Hydrologic and Hydraulic DataCheck List - Visual InspectionCheck List - Engineering Data

2. Photographs

3. Hydrologic Computations

4. Pertinent Data

5. References

,-. U

PREFACE

This report is prepared under guidance contained in the Recommended Guidelinesfor Safety Inspection of Dams, for Phase I Investigations. Copies of these guidelinesmay be obtained from the Office of Chief of Engineers, Washington, D. C. 20314. Thepurpose of a Phase I Investigation is to identify expeditiously those dams which maypose hazards to human life or property. The assessment of the general condition ofthe dam is based upon available data and visual inspections. Detailed investigation,and analyses involving topographic mapping, subsurface investigations, testing, anddetailed computational evaluations are beyond the scope of a Phase I investigation;however, the investigation is intended to identify any need for such studies.

In reviewing this report, it should be realized that the reported condition of thedam is based on observations of field conditions at the time of inspection along withdata available to the inspection team. It is important to note that the condition of adam depends on numerous and constantly changing internal and external conditions,and is evolutionary in nature. It would be incorrect to assume that the presentcondition of the dam will continue to represent the condition of the dam at some pointin the future. Only through continued care and inspection can there be any chancethat unsafe conditions be detected.

Phase I inspections are not intended to provide detailed hydrologic and hydraulicanalyses. In accordance with the established Guidelines, the Spillway Test flood isbased on the estimated "Probable Maximum Flood" for the region (greatest reasonablypossible storm runoff), or fractions thereof. The test flood provides a measure ofrelative spillway capacity and serves as an aide in determining the need for moredetailed hydrologic and hydraulic studies, considering the size of the dam, its generalcondition and the downstream damage potential.

-, AL----.

SECTION I PROJECT INFORMATION

1.1 General

Authority to perform the Phase I Safety Inspection of Lake Ashroe Dam

was received from the State of New Jersey, Department of Environmental

Protection, Division of Water Resources by letter dated 12 August 1980. This

Authority was given pursuant to the National Dam Inspection Act, Public Law

92-367 and by agreement between the State and the US Army Engineers District,

Philadelphia.

The purpose of the Phase I Investigation is to develop an assessment of the

general conditions with respect to safety of Lake Ashroe Dam and appurtenances

based upon available data and visual inspection, and determine any need for

emergency measures and conclude if additional studies, investigations and

analyses are necessary and warranted. The assessment is made using screening

criteria established in Recommended Guidelines for Safety Inspection of Dams

prepared by the Department of Army, Office of the Chief of Engineers. It is not

the purpose of the inspection report to imply that a dam meeting or failing to

meet the screening criteria is, per se, certainly adequate or inadequate.

1.2 Project Description

a. Description of Dam and Appurtenances

Lake Ashroe Dam is a 220 ft long, 19 1/2 ft high earthfill dam with a top

width of 30 ft and upstream and downstream slopes of 3H:lV built in 1972.

It has a concrete drop inlet spillway with inside riser dimensions of 6 x 2 ft

and 24 inch dia RCP discharge. There is a 12 inch diameter valved CMP

low level outlet which discharges into the spillway riser. A toe drain

) system which involved 4-inch diameter perforated asbestos-cement pipes

and a rock fill toe blanket is reported to exist at the downstream toe of the

embankment. An old dam structure exists below normal lake level across

the stream channel approximately 1200 ft upstream of the present earth

dam. Struble Road lies across the lake between the old and the present

dam structures. A 48-inch corrugated metal pipe is reported to exist under

the causeway for Struble Road.

b. Location

Lake Ashroe Dam is located just east of Struble Road off Rt 206 in the

Sakawawin Boy Scout Camp in Stokes State Forest, Sussex County, New

Jersey. It is located at north latitude 41011.0' and west longitude 74048.7',

A regional vicinity map is given in Figure 1.

c. Size Classification

Lake Ashroe Dam is classified as "Small" on the basis of its maximum

height of 19 1/2 ft which is less than 40 feet. It is classified as "Small" on

the basis of its maximum storage capacity of 697 ac-ft which is more than

50 ac-ft but less than 1,000 ac ft. Accordingly the dam is classified as

"Small" in size.

d. Hazard Classification

In the National Inventory of Dams, Lake Ashroe has been classified as

having "High Hazard Potential". Visual inspection of the dam indicates no

residences or properties exist immediately downstream. Review of the

U.S.G.S. topographic map shows that a few scattered houses and a

secondary roadway exist more than a mile downstream. Therefore, it is

proposed to change the Hazard Potential Classification to "Significant".

e. Ownership

Ownership of Lake Ashroe Dam is by the Boy Scouts of America, Thomas

A. Edison Council, P. 0. Drawer L, Edison, New Jersey 08817.

f. Purpose of Dam

The purpose of the dam is recreation.

-2-

. .. 4 ',

g. Design and Construction History

Lake Ashroe Dam was designed by the U. S. Department of Agriculture,

Soil Conservation Service. The plans are dated 1969. Actual construction

appears to have been in 1972. Based on available information, the dam was

built to replace the upstream old deteriorated dam. This old dam appears

to have been built in 1921 and still exists at its original location just below

normal lake level.

h. Normal Operational Procedures

No operating procedures for the dam have been found.

1.3 Pertinent Data

a. Drainage Areas 1.2 sq. mi.

b. Discharge at Damsite

Maximum known flood at damsite unknown

Drop inlet spillway capacity at max. pool elevation 62.4 cfs

Total spillway capacity at maximum pool elevation 62.4 cfs

c. Elevation (ft. above MSL, adopted from original design drawings)

Top Dam 798.0

Original design high water 795.9

Recreation pool 794.0 (Assumedto be spillway crest)

Spillway crest 794.0

Streambed at centerline of dam Approx el 778.5

Maximum tailwater Unknown

d. Reservoir

4)' Length of maximum pool Approx 4,130 ft

Length of recreation pool Approx 3,930 ft

-3-

e. Storage (acre-feet)

Recreation pool 469 ac ft (Assumed tobe spillway crest)

Top of dam 697 ac ft

f. Reservoir Surface (acres)

Top dam 60.8

Maximum pool 60.8 (Assumes topof dam)

Recreation pool 48.2 (Assumed to bespillway crest)

Spillway crest 48.2

g. Dam

Type Earthfill

Length 220'

Height 19.5'

Top Width 30'

Side Slopes Downstream 3H: IVUpstream 3H:1IV

zoning None I.,dicatedon plans

Impervious Core None indicatedon plans

Cutoff Cutoff trench, 10 ftbelow base of dam or toBedrock whichever ishigher

Grout curtain None indicatedon plans

h. Spillway

Type Reinforced concretedrop inlet with 24"1 diaRCP discharge

...

Length of weir N/A, inside rise dimen-

sion 6' x 2'

Crest elevation 794.0

Gates None

U/S Channel N/A

D/S Channel 24" dia RCP dis-charge invert 778.5

i. Regulating Outlets 12" dia valved low leveloutlet discharges intodrop inlet riser.

SECTION 2 ENGINEERING DATA

The available information concerning the design of the dam consist of plans

prepared by the U. S. Department of Agriculture, Soil Conservation Service for

Sakawawin Scout Reservation, Middlesex Council, Boy Scouts of America, Sussex

County, New Jersey, Drawing No. NJ-01-726, dated 1969.

Very little information is available concerning the construction of the dam.

Harold E. Pellow & Associates, Inc., Consulting Engineers of 100 Main Street,

Sussex, New Jersey 07461 signed the completion report for the Lake Ashroe Dam

and described the foundation and dam material in a letter dated 24 April 1973.

No construction records for the dam have been found, therefore the

validity of the above drawings cannot be ascertained.

No engineering data concerning the material properties of the dam and

;r foundation could be located as informed by the office of the Soil Conservation

Service. The available information is not adequate to perform a thorough

evaluation of the dam.

SECTION 3 VISUAL INSPECTION

Lake Ashroe Dam appears to be in fair overall condition. There is minor

surface sloughing and erosion of the downstream embankment. Much of the

-5-

surface erosion has been maintained by filling with cobbles and boulders. No

seepage was observed on the downstream face or toe during our inspection. The

embankments are sparsely covered with grass. No trees or brush are growing on

the dam proper. The toe blanket was not found to exist and no outlet of the toe

drain was located. There were no observable movements of the dam alignment.

The drop inlet spillway was unobstructed at the time of our inspection. The

reservoir shoreline is gently sloping and forested.

There is a wooden grate at the discharge of the outlet pipe of the drop

inlet. Downstream of the grate, the discharge channel is lined with boulders and

then flows into densely vegetated forest. No residences are visible immediately

downstream of the dam.

SECTION 4 OPERATIONAL PROCEDURES

There is no available information concerning operational procedures for

Lake Ashroe Dam. The surface of the dam appears to be reasonably maintained

as no brush or trees were growing on the dam embankments and areas of

substantial erosion have been repaired by the placement of cobbles and boulders.

There appeared to be no warning system in effect.

SECTION 5 HYDRAULIC/HYDROLOGIC

Available information indicates the dam was designed to have about 2 ft of

freeboard for a storm equivalent to 4.1 inches of rainfall with a peak inflow of

758 cfs. The pertinent design data is included in Appendix 4.

The hydraulic/hydrologic evaluation is based on a Spillway Design Flood

(SDF) equal to one-half of the Probable Maximum Flood chosen in accordance

with the evaluation guidelines for dams classified as significant hazard and small

* in size. The PMF has been determined by developing a synthetic hydrograph

-6-

- 7 : - Ii I .. . I . .

based on the probable maximum precipitation of 22.0 inches (200 sq. mi. - 24

hour). The Corps of Engineers has recommended the use of the SCS triangular

unit hydrograph with the curvilinear transformation. Hydrologic computations

are presented in Appendix 3. The 1/2 PMF peak inflow determined for the

subject watershed is 2,558 cfs.

The capacity of the spillway at maximum pool elevation 798 is 62.4 cfs

which is significantly less than the SDF. Flood routing for the 1/2 PMF indicates

the dam will overtop by 1.99 ft. Therefore the spillway is inadequate. We

estimate the dam can adequately pass only 14% of the PMF.

The present drawdown structure consists of a valved 12-inch diameter

corrugated metal pipe which discharges into the riser of the drop inlet spillway

at approximately invert elevation 784. Its operating condition is unknown.

Drawdown of the reservoir has been evaluated assuming that the drawdown

structure is operable. Our calculations indicate that the lake level could be

lowered 2 ft in about 10 days.

Computations by the Soil Conservation Service indicated that the flood

level from a 25 year storm event would not overtop the causeway for Struble

Road at elevation 797. The hydraulic effect of the causeway on the dam should

be further studied in future investigation.

SECTION 6 STRUCTURAL STABILITY

Based on visual observations, Lake Ashroe Dam appears stable under

conditions at the time of our inspection. Based on available information, the

dam appears to have been constructed in accordance with the engineering

specifications. However, no construction records nor information concerning the

engineering properties of the foundation and dam materials have been located

-7-

during our inspection. Consequently, analysis of the degree of stability of the

dam cannot be made without gross assumptions concerning the properties of the

materials.

No post construction changes were observed during our visual inspection.

Lake Ashroe Dam is located in Seismic Zone I of the Seismic Zone Map of

Contiguous States. As inadequate engineering data is available, the actual

degree of stability of the dam and appurtenances under stress conditions more

severe than those observed during our inspection and its future performance

cannot be evaluated without additional investigation.

SECTION 7 ASSESSMENT, RECOMMENDATIONS/REMEDIAL MEASURES

7.1 Dam Assessment

Lake Ashroe Dam is less than 9 years old and in fair overall condition. The

dam appeared stable under conditions existing at the time of our inspection.

However, inadequate engineering data is available to assess the actual degree of

stability of the dam and appurtenances. Additional investigation is necessary to

adequately evaluate the future performance of the dam.

The spillway capacity as determined by the Corps of Engineers Screening

criteria is inadequate. The dam can adequately pass only 14% of the PMF.

7.2 Recommendations/Remedial Measures

The following are recommended to be done soon:

;*Y, I. Investigate the operating condition of the low level outlet and repair if

necessary.

2. Determine the drawdown capacity of the 12-in diameter pipe using more

precise procedures and increase drawdown capability if necessary.

3. Develop written operational procedures to ensure the safety of the dam.

)i

i-8-

The following are recommended to be done in the near future:

1. Clear vegetation downstream of the drop outlet pipe to provide

unobstructed discharge channel.

2. Evaluate the hydraulic effect of the Struble Road causeway on the dam;

modify the causeway if necessary.

3. Provide emergency spillway facilities.

4. Perform additional investigation to determine the engineering properties of

the dam and foundation; whether or not conventional safety margins exist

under more severe stress conditions than those observed during our

inspection, and what modifications may be required to achieve such safety

margins.

-9-

FIGURES

0,A 411181 9 Ain

ML Sol M,

AA AZA9 IS, Unio Aft no Island

-V w n ype

$7A PARK

Qu 'Ile lerowAJONANDALC bEft"illt

1 1 ST0991 tOWIT .0 Sly A I,

Sandy 0Ferry Plurnbsock Glans

LaYtty z

ft4no-ow , SUSSOeernervill

IL % Z

ean rmano a tosit sb Pa

N '.I McAfeeFran rd 'PAWAYAMM ARUN

OREST v tat -11I PA OM SIATILIF

L_ Pelteno sly h R iIlp Bsave

Sao noburgA

% ft

North6 LAAq Auruste Church aville

23 k. -k -wa C.-

Cot. on!e CdwrNon! dystori-,Mon!Is -"F r an k* pww b.

I lisG -A LAAg

H LafiI ch.- astvillePoint 0 Upp.

a InB__ I.A Mociawartswood Oidetu U

V,,0A ! P, Do.. d Is 23LAA.

a Oak Hi

14 9, -,1. Newf nillan

Sly 72

Miltodal k. ke Is P ersbuirw

It A A^ US, ohaVA enA

A Woods I I.1 pold P-W

Bri to r Woodpo efferson May- Is Kinneunt H G I asse

Gr of Hurdtown Am1 h );P.-"

A ura Trat itys Sp r Pf4w TIPI I

Sly pn III Pa ARGI OfLSk* -r- I my r1I

I LISP7 11 Vtom Pa - -7- 1 , III Mir_7 It: vpatconj x - %I L kt..d j-wor 11- / ---sts ps MIddletown Ila PQ, rV1 M kj

Laworronvl N cxaw

k we of MoUntUk

Budd LALAUl1 A PAPA Succa 3

! PallS 46 111 live I V MIII 6 -Tm

shanovam: LIKIDftftw riders ca I0. cop

Pa. mp. -CA, IXAFV Slydo I 'T WI ML Freedom Cadeington I.0 W Ran of h !!rr

KLblUNAL VICINITY MAP JOB NO.BY-- DATE

LAKE ASHRIDECKO_ DATE

r* T

oLAVE ASI-4FOE

4',4

625- 1

5LRlCC PO H' cI.AES i AS AD0'IPTV~ S~IA AWVIN

SCOUT LIESERVATION AT LAI-E Asl4jzoe ("s7--12z)P-~ATe:P MAY, 1969.-

DAMSIT-E AWDE~ LAKE AtZEALAY4E ASH;ZOE DAM(OOO0'5)

LA14E A6WsOS* 6U'5SE' COUN4TY1, W.J

LAN GAN ENGINEERING ASSOCIATES, INC.

990 CLIFTON AVENUE CLIFTONNJO?1ORN. BY, p_> ISCALE' N. T. S. JOB No. .8 014 S

rK'n s Y.' P)ATC: 5F '.-- 0 N By

sromff OR 90CA' =IL L(M4Tc~v'-.O 447e4,10r,0 4SC4M).

ZOPOW

OAAOAA

-V3

~~14

0O- 4'01A. )VOAI-OC. '.' UM/A dV A

-STA.2,446

01A. Ml. COC. 79.93 - 798.879.71.

rev R40clarov D AM -r rr ojI44eL 4LV 7-9.0a

- De1/gA, I/All rm 4re,- eL -Y 7 95. 9 V ________

N"

c~lr o-, nzmc - eK 7

PQNl- H211 O :.~

ANT S jzT m =s 4 A-A A > ~ s l~ 4 P~ w

PLAW7 AMD~'A PN0IEO A

99 CLFO/VNECLFO1.71ORN B F rj ISCLE wT.. olBtw 8 4/

CX*D BY,,.V.U..- IDAT 9-2 - 0 -[IG.N

AfDAM

8ERM IT

lj _____

l3i- 10 - :.eoEIi _/5 NJ

qJ') :SLP

l/5

--Pt OFO BERMIWA K.OMD1 1 I

m- ~ ~ ~ 0 o, A / a /lE7T. rA 4

Deslal ielale W rjF~ 4-4f 79S

.6 (zv. ~ 794.0 &eA

8a' 7rse

-/,voo j34V 7.94./06A

Cd"eH:AA 40/AA'A1 AMDA

2, IRC

cO~lecrMCBAMOIC .41/4'41 5L/

COA/C.AIC RISR 85, -.

PIZPIE:THQLJ OF=- .5PJLLWAYi

sec-noN OF= DOWW YrZAM- LEFT AE5UTJME=NTSHOWII46 6W FILL AVEA 4 TO~f DMIAIN

-2 'r0 OR/A Pi4AI Re

oEVC xo it~ a,-.J 4~ -,r 7-A ZU Sl 4 7WAWI0 9SC-U 'EMt2-lcl 0A?,41A1

SCUTAisev'omA LAKEO~ SLI5zae(NJ.(jTV ,,J.T

LANGAN ENGINEERING ASSOCIATES,INC.

990 CLIFTON AVENUE CLIFTONP .07013ODRN.9-f' ;;? > SCALE- l... jOs ho 8014S

- JCKCD. BY- VLUDTE f-8 FiGs W, 4

:Pj

APPENDIX 1

CHECK LIST - HYDROLOGIC AND HYDRAULIC DATA

CHECK LIST - VISUAL INSPECTION

CHECK LIST - ENGINEERING DATA

A!

CHECK LISTHYDROLOGIC AND IUYDRAULIC DATA

ENGINEERING DATA

DRAINAGE AREA CUARACTERISTICS: 1.20 s.. mi.. avq. slope 5% wood & fores land

ELEVATION TOP INORMAL POOL (STORAGE CAPACITY): 794.0 (469 ac-ft.)OF DAM

ELEVATION TOP Z" =MpD)W (STORAGE CAPACITY): 798 (697 ac-ft)

ELEVATION MAXIMUM DESIGN POOL: 795.9 (original design high water)

ELEVATION TOP DAM: 798

CREST: Spillway

a. Elevation 794b. Type concrete drop inletc. Width 2' x 6' Drop inlet with 24" RCP outlet Pipe (120 ft-)d. lengtl N/Ae. Location Spillover Right abutment of damf. Number and Type of Gates None

OUTLET WORKS-:

a. Type 12" CMP intake pipe (34 1f) thru drop inlet to 24" RCP outlet pipeb. Location in drop inlet spillwayc. Entrance inverts 784 ±d. Exit inverts 778.5e. Emergency draindown facilities Same

HYDROMETEOROLOGICAL GAGES: None Observeda. Typeb. Location "_c. Records __

'AZDaX M NON-DAAGING DISCHARGE- 62.4 cfs (water at top of dam) _

-. 1

- - 1-1

- ~.-- - - .--- ~ ---

U)4o0

N4 0

.E-4

0s 41

a t

-1 4)"

m 14

14. 00

[-4

0 ~ 4) 0)

ci

LIOD 44

00

0 0-

,-d 4) C14 4

0- 4 )

4-)U) 3: P

U) >4. 0l4

LMI

.E.

0 0

z

HMH

0 Hw U) u

Q~u2

z Iz4

HH

0 z-

OZO)

a% Z aa0 U0

z 0 'z rz

0*~c 2 .0 zz

< 1-40 3

p-p -eaw,.Ew w--w

54!o

00

o U)

0

om

o ) LO

•H

n 00

S0

El) H

0 Ix

U) En u

° z

0, 04 0)

o Ud o

1--4U) 1-4

[0 0 00

01-

&A& - k

z z

i~I zra 0 0 0

E- -E-4 H

04 .U) U) CIn *z

z H H 0

0wd z 04

04 040

C) 0

04 wii~ >4)0 £) Uz d z D C

E- ) 04 -4

0, H< 0E4 ZE-FA>I HC)

C))

>4U

0* rL 04 lUI~~ 0 i- :3

04 U 0 0 E

Cal H - -

z E-40 D

z~~- E-' H- z 41

1. 4 0 w

'-Z v~O CL,00 I I 0 1

c:-

Z314 5

*i.~~~~~C V :3 ~ ~ w----- -.

C0

0

-4 L

i

Cn E4 0

x

0 4

El)

CC

.1 -

C

1-1-0

.040(EH

u cJ

C4z:

co

;14 00 H

0 0 I

0 0

E- >4H EH

> M >4

.44w 0

4 .4 .4

zH

Z~H z

z

03C

0

v 1-7gr-

7i

U)

UY ) <U>

ZH) U) 0) Uu) z U)

0- U)U

xo =w E U)C' Z n

0) u H

0 ) ::HO

U~ z U) N)'-

C) 0

Q %D * U) m) z 0 Hc

H H g *0 1

U) 0U - .HE -

z U ZU~)UU

0~~~ ~ * C U )U )

H.U H 13 U) >

U) E-40U

>C4 PE U)

0 H~ Ha Ez c

z H EH

W 0C

H Z-4 E-4~~U(-4 U) >)* U

(-4 0U OlOU

L ) 0) U)Z04

H H U)CU7)OH U

0)~ LO w 4 4 p

u~ >U U :) ~HU)~ 0 0U)0~ ~ ~ u 4 x

EAf Hn *C'10HZ H ~F4 )O WOPr4 fCJ (O

(-4~ .U H OHZ

H~ ~ H 54 0 U ~ (.)

U) %.0 0) U) ~ nH) : UE4> -1u 020

U6 E * U~~ m))~- E-U) 0

H. < )" (- 0U 44 co

01 r-4 r P4O E4* H0E4~ <

1 13 ZI *C) 0 -1

H CH H 0 [-4U)U E'-4J U)U)%0 H C; 0~ '- )U

~E-4 0UU ZUUU) CU)U) H ~N) U) '- :D U) 4 H1

(0 U) (q U 0 U) 0 *1

UC N ) ) t.1HU ) C4 Q x , )E.

U) (*4 U)~ Hr - j

4 Owxn0WE HO E4 0) 04 U WP

z tzPU~U N 0

Q 0 0*4 0

.4 E- A i -

CC-

0p, 8- 1-

1-4 1-8

u.. , c

-H

z

o 0 NU ,

zzHH

0 z

U HH C)H z

> U

wO cn0 n

Hn H H

000

U,)

-oz <

~UH z

0 0 UL 0LoU LT E

OE- O O H "] -0 O Z >

00

U ) H] U ))

4- O

H H

O W 0

0 0 z 0 0

ZO 0 I<E4E Px El E

0< 0

z z

) 0 z- 0

< <9 0

0 0:

cun DIq <p ZH EHzP

C1-.F0

co4 E-4 aw/ 0 0 H :3: C) <-9

C)---.-- U .54 F- a- Q

a

z 0

0 0*z E-0 p

0 Ej z

zr.

.0 0 z. " " Hz w H 0 4

H 0 Zz Z

0ca 0

ciz z0 0 0ciC E-i

0 a. ~E-4 CZ U 0

4- w 00

/ 1-10

z z Z0 0 0 0

>0

CDU) U) U)zz z0(N 0%0 0 CN

000 000 00 -

En c En0I )MZ OZ O

H - E HE-4H ':Dz zw

< H * H w < H k

00 00 r0

:D U) L

0 - 0u

0

M U)

Di U)U):D U

U)

H HHU

<. PU)

00 54z0 0

0) U!

U) H )

=)I 2 )

Er, 1 1 8 2 8

r(a Po5pU) 50 4 0 H1w11

,' ,H

APPENDIX 2PHOTOGRAPH]S

~t

View of downstream embankment 26 September 1980

• f

Repair of eroded area by placement 26 September 1980of cobbles and boulders on down-

stream embankment.

LAKE ASHROE DAM2-1

. - ' " 2 . , i ,, ' - l " .. .- 1 [ "

Crest of dam viewed from left 26 September 198

abutf~ft looking to right abutment.

Drop inlet spillway at right 26 September 198

abutment of damn.

LAKE ASHRO~E DAM2-

View of upstream face of dam. 26 Septemoer 1980

View of reservoir from center 26 September 1980of dam.

LAKE ASHROE DAM2-

- - -. ' -- .' ---- - .. - -~------------------2-3-

24" RCP spillway discharge with 26 September 1980

wooden grate at downstream toe.

" 24" RCP spillway discharge, 26 September 1980

wooden grate and downstream

channel.

LAKE ASHROE DAM2-4

7, ,,7--. ..' . . .. . - - -.. . - . . . . ... '. . . '--

APPENDIX 3

HYDROLOGICAL COMPUTATIONS

9.,

- - --

LANGAN ENGINEERING ASSOCIATES. INC.

LmCra A 17 oT3' 5-* M

_______n S~~ esc 6 L, IU-T.

Liz~rL~ 4 9 Z-L 4

A;1 1W d 4~ 4 -tV-P- 6 ~0 Kr 2(e .0"a -(o V 4

.< r& - ottkct... - 4 4. / ;,-4c

PP

BY.- OmC~ DATE It SHEETot-30 NO..

- .*- - .- .K,-..--- DAT SHEET------- NO -


-4~c~oi.-i.-o #.-- (-"o/ .s,

0-- /It I //2.6-/'z t -3 / -3 /.

O -4; /4 . 2

4-Te- Oki A'u-ka A rt

43006 7,0 6

CKD DATE 4_c let SHEET NO.____ OF_


. ,plo.x ea to?

0'oe~ V4oc r -,jS~

77, 4 Af/

4 /o + 300 a '..A /.

2.~L. e, CeAtv =!~~ 7 Td

Te. S,,., F=-=.;-,0-7

; .

BY ~ DATE fh/tl L4L ArJL .- W JOB NO. WC4~

CKD fE. c- DATE,1618( SHEET NO... OF___

IL1

LANGAN ENGINEERING ASSOCIATES. INC. ~}Y'(/,9 ?,~

~ ~ ~ ~v 4~e~ 6~7'A

cit w a 0 4/x-e4 4(, 4-L I, (he aef4 /,tf~

CK 6- DATE'_SEE NO.~ OFc~


r(\TO-

I.~ ~ Ll L '*3* -0 -,D~~A

1~4 4

By DATE A t^ k4 JOBNO. _______

CKO___L DATE _______________SHEET NO. 0F__


)C

K5

f ir

K.

rv.

0m-

tK

BY __ DATE __.__-,_.. _______-JOB NO.___________

CKDf?2'4. DATE 642I.__ SHEET NO.__ OF-


69D Aa.. 7 z6 {jiiic izx-

Il

77-/ ;17.<

By __ DATIE y-jo- . / 6/' e JOB NO.

CKD DATE, i "i SHEET N. 2 O


J~~~7 , +T -d ,si

CK04 12z,9DAT~EX 2 AXX&'~4le /2

6!

I

CK<°7" DATE -j-#"A.- SHEET No. II" oF -


0kFPZToP11Aj~r Po7?'JTh14L-.

7.4,o0 o 4c0 °O

PA4 F 44 , 14fS4-

L2a)

!'Q-

y -DATE __,_, ,_. JOB NO. __________

ICKDQ- DATE ___ _____ ______ SHEET NO.A . OF

LANGAN ENGINEERING ASSOCIATES. INC. 21 %j 6 r ,4 C/

cu7%, ,

-,4 , ~5

Bi DAT k-1 .. N0

s> /

67 c -I-

I , ;4 /.5 3 "7

'- *.... -


A3 7/ fr&L__ _ b//-/</5 1/7,/ 2

By_ DATE JOB NO. /CKDO] _ DATE 6__ f _ -_-_,/__vl SHEET NO.1Z. OF__

----..... ....-"- - - .- .-...- .--- ,-I,--, - "-.---- -

LANGAN ENGINEERING ASSOCIATES, INC.

.. 2-4 -C

-7q92 -2

34. d?-C 6-7'z - 3 -d

4L ?-, F3 344 o

7-:? -72

,ti

BY DATE /.4r. J No._______

CKD-W --. D ATE 4.MLI SHEET NO.7,./ -OF_____

/7-" -- ---

CAi6sg * eI' ~ SEE P___

LANGN EGINERIN ASOCIAES8INC

x' 99, A

HEC-1 OUTPUT

LAKE ASHROE DlAM

Orr'

0CD

100

o C

N4 4

zz

x 0Ir Li

A ON W.c m wc

CA X 0 Q

mozz cc 4- *

-o~ N In 0 0

-~ . - W NZ *-CD-

I' MC -w* w o

cln 09 4= ! 4f030N 0.0 W ,

of

" 49- =0 f- . 0. a.. x3 00 : I

* 0 - Ow x In N 00w41 Of -1 44 * In 4 4

00~~~~0 0;5' 3.OZ

x i. c. 3- Q 0 0 La

4 Z 4C I --- ~0~~ 1-W Z

N~~~ 0 0N44-44 * A It0

0

0

W 00000000000000000000000041 0 o

D, N- w- 0 O000 COCCO00000000COO000000*t 00 5.

-0 a4*0 . -

- . . II * Z 0000 300000000000000000000@

0 0 r z 1 c y

0e o CV 0 0 o

4 .0 aO ftS~- - -- - - - - -. . . . . . . . . . .

20 z

~(4 Lo.o) o 04 0 0 w o OO o00oro0C00~0o0

S. n C4 C0 Z 0 000000000000000000000000

U) * 0 - - 00 00 0. 00 00 00 00

-g :-

00 I''- 0N N N~ P M 44*0 00 0 0

0 ~ - v0 0*~

att

00 - -0- -- 0 -i- -

c L) 0 IN a.' 4. I-- 0. P-0 CL Z 0 -w5.

4* C Ef) 0N IX N.4 4* x .5 0~ U- . 0 cc

x* o0. 4- La .

0 4* .. .......................

0 :Of1 M <2M. .... .. . . . . . . . .rz 40 2 L0N CJ 0 W( Q flUW Zr 2 4wI 1 N ~~N rv14 14 14 14 N 1 4- 1 4NCN NN

I * = 0o . W.-0 0 >. - l.CX '- 40 14* cc z0 it~. r .at i uC a C 02x

- 0 w4 cc" W ~ I

4 U . N 0 -0 z ~I ccC. Z 0 ,.54a 4 IL0 o t0 0 0 09L 10 40 00 cc 1

z -1 L5 4- Z

4* -. to0

a N 1; 4- N; 4- C;?' 4.5 4;.;Z.;C; ;.01;0; 00 4; ; 1 1;4;0 ;0 IL 0. I- IN (K0 W ) en cc

of " 5a. 40 0

6 3.- w0 C20 1190 0...- I

u 99 4 -1 4.C In -0 Co *1 4vIC ~ 0.4 1 M 10 N W 0 44 % 4It I. -0 >. 14 -

0 9 U

4*!- 2l 42 15-

4* -5 ---0% M

4* A

704 7

mm n -n -1 -q- q -1 1 904 M. *!q o." -1 9~0

00000000000000 000 000 00 000 000 000 000000 00 0000,00000000 'r @

0. 0 0n 03 0, 04 0n 0V 0 0 0 . V 0 M 0 Z5 0 0 , 1 0 N 0 01 0 0n 0 0 0 0 0 v 00 00 0. 0 rM WM Io~ 4n000000004..40-4F f r 3

N ; 1; 64 Y: o N r 9 o, .0- 4 ac rZ N 9 , c; 0: c, N 0 0 0 -N)4C~N9~ - - -1 - - ~N9~0 Nf ~N N4MN NN NN 09 99 999 00 00 00 --------------- --N-NN----N --N-NN ----- f

.4.-- -- -- ~4 --- ---. 4 N N N N N N N N N. N N N N N N N N N N N N N N N N N N N N N N N4 N N N, --%f

-------------------------------------------------------------------------------- -

N ~ N N N1 N N4 Ne;NNN N, N. 4 N* N N* N4 N N NN N NI CN N NNNNNNNN NNNNNNNN ;

00000 000000000 000 000 000 000000 000 000000 000000000000000

000000000000000 C!00000000000000000000000000000000000000000000 00000l4 1 1 4 1 1 4 I~

4OOOOOO4OOOOOOOOOOOOC!OOOOOOOOOOOOOO!OOOOOONNNNN 1! 1!

* ~ ~~~~~~~~~~~~~~ *100 0 0 0 0 9 0 00 0 0 0 0 0 0 0 0 00 0 00 0 0 00 0 0 040 0

NWO04NfqVIN9O0.4NI4NO~04N~WI,~9204NC9~04N N @.Nmmm4MIamp-U

11 4 NI

* ~ ~ ~ V 0000 00 00N0 00 0 00 0 00 0 00 00 0 00 00!0 00 00V!00 0V;0Di 0a4. 4cN NNNN0z wzz 0

4 41 1 1 1 4 1 ! 11

.44 .. 44. -- 4. A.. .. 4444.n...~4 - ... 4-4 4 -- ~4 ~ .... . 44 4

,00000000000 co00000000000 00 000 CO0 O003000000 000 000 00000 0

(;r N,2inqqqq00 0 00000000 00000000 000000 0 0 0 0 00 '0oo -,

00 ON)

N

9J 4 9N)C

31 0NNNNNNN NN NN NN NN NN NN NN N NNN N NN NN NN NN N N N.N NNNNNNNNNN

N) 0 V N)0 0 lV 0 Cl 0 - N 0 0 a 0 0 0 0 0 d0 0 N r0 0 0 0 0 0 N) 0 0 0 0q 0 a 0 0

----------------------- - -.. N 4N N N N NN NNNNNNNNN14NN-4q

ON144 -a"C

in .'0r

4 US

in r )0 W0 -N wo-Ol0N),0 NV NN n wo N W0NN N m w NN Ma- ON wnN1. *1 0 0 0 0 --------- : N :! N) N Z) N N -- :!- ""-

N..

kM V ) N0 N -0 N0 N Z 0 0 .0 1 0 1 0 b 0 00 0 0 0 0 0 0 0 0000000

o 0

0

NOO.0 N 0 N

if z 0 0I.- . 0 P.

-' 4. 4 3Z 4 z '44Z;;4 .;D

D .' 0n 0N Nif-Nm A

I- 0 A. ~ J 0 V. 0 M , C

-14

... .. . . -iI

a 0) -

j 0 a U. 0 ' -000N~ N flq00q ( x rl 4r'.-- N

if .''0f ~ ~ ~ .- .~' . .~ . 4

-- -N Ii - -0 -

f X000 00x ix w I 0 w

Nf 0 00 L-in M .N mf x. 0 ~0

if C C 400

if 0

-~~~t 0- IL.0'0 - (

a 0 3 .0. M N 0 0 P-~~C -j4 . .

ON x I 9L ~ if I . 00

-~~ -* a 0f w -~n

'O0 'N f 0 0 044 z;. ~ ..4 w -W 4 .0 i

M a a. "' 0ad

I.. OCOf In-NN

- - - - - - - - - -2 tM 1; - 44 - -- 0; 4 - f0' ) -

N~~~~1 %6O"N ii'0- . 0 J

X10

0

0..<4 X0 z a

-0 c -j Z00

(0 w0 4Z00- , 0 0- 0 D.

0 000 -M z

C)( ZL L%

v. Ck W! II I !Cmm m v .w w n ~ nIna- QcI N. 0t-

40 4Wn

t . *

tj A0

I 000000000000000000000000000000000000300003000-

INN NN NN NNN NN NN NNNNNNNNNNN NNNN NNNNNNNNNNNNNN%?

4; , #444. Z4; Z) A Z 4Z;A

rPn0N mo 0 N M 0N mo~3 N o 0nO~3NMI 0N 3N MO3N no0 N nO3NMO 0N Mi N "O3N MO N~3N~3N~

ow in a 4l w *. N 0-0- - N - Ul -4 N 'm a. 0 -; CV 4 Y7 * N3, N

.1 di w' 0 0i g~d hi hi 44 4 44 4 N NN 0 0 0 0 0 N N 033 3 3 3 0 0 0 0 0 0 0 0 0 0 0 00 0 a:

... °°.°:.°°.:4 NN°oN° 444°°°°..°v oD!Atn raa,*,°.a NNN NZ°mm as 0

--- - - - ----- - - - -30303333300 0003030000000030000033000003000000000000000000000

- -- - - -- --- - - - - - - -- ------- - - ----- - - - - - - - - - -

N N ..4 M.N CVN. N . ° . .N N. NN N. N. I

2. 03 0 0)3NM0NM 0 a 0 0 N 3 NN 0N~ N M M M 0

- - N N N N N N NN NN NN NN NN NN -4 N N N N N N N N N N N N N N N N N N -4 N N N N4 N N N N N N N.NNf

'..N ., 0. ' 0, .- NM4U)' 0 0 3 , N ,''. , ,d . '. N 0 , 0 - Ne "4 U).N 0-NM 4 (1' N, 0e 0 3 - N 7') ' 4 U') 4 N 3* 3' 0 N .) .U'

- * ' ' M 7)7)M ' 4 4 4 4 4 4 t )I' )U)44 ' ' )4 4 4 4 N N NN N

00 0 3 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 3 0 0 0 0 0 0 0 0 0*

I? I?

.N NN n nU0DJ D a V -046 OW .0 ;!m w -a."in

v'-30~N. 0 4 l 'a '0 a No N0 0 -a o o o -4- 4 0o o 3 0o 3 -w -w m o r, 4q r, :Z v m - v) A m0 o rN cD w m o m Nn 0' w In a.4N -n w In0 a a w I 0 2. 0O0 a0 4w~ .1%.

P% -- -. N N N - -

~ 3N 10 NM 0N 0 ~ N 2 N 0 ~ N~ 0N ~ 3 ? 0 ~ N ) N 3 N N N N ,N 00 N M M 0 0. 0. 0 0*~0 a*-

N m w' L 0 a w 0 a N -1 w' f0 N '0 A N N w 0' 4Nr qL 0N0 '3-NP~ A' 0 -3 0 -N M' w' VI - N 5,3 0 ; N " W' W) 400000003'''000'''00000000 -- p

.. 4 ....... N N N NO O N NN NN NN °NN °°N ° °N ° NN °N°°NN° NN NN Cf A

-. 00 0 0 -

N 24' A 3 N g4' A 3 N 2 4'IA3 " 4 I 3 N1' 4 I 3- N'74'LA3 g 2 4'LA0 g 7 I 0 N 2 4'Vi N '7 V 0 N 7 4 V

~a)

" 2"~' ~ ~

0:~~~4 0:Q !"1 W ! 1

* 0

~ - ~o ~oo . 4* a.

N 4m wN2N mmMNNNN NNNNNNV.N a* Zc- 0-

a

0 N 1) 0N m 0N-un atN - Oflr m O. m0NnN 4 N m0 N0 0'C N 0 N 0 N -. 1 'Ofl0 N OC~'

4* 0

ir W

* N - 0 c*

Nd Nf N )' N W0 00 0 NC 0 4 NN N N N n M M M n M 04C

- 4*

La.

A6 77i

wJ

z zcoo.. 1 C4 I

LL00

0.

tL XWO

W 4 .Ji 0

c -.J t0

J- w Ix 0 u4- 4

4 CL

J 4 a-j = -j Z94 96* IC L

-w 02.~

w ) 4 - N

4c

4c I

0

.5~~I z4. 00.J 0

t.e .. I- "W 0p-U~ 4. 4c

4 0 ~C .N .

*44' 2C 4L4 4* C .4 *

4 922 *, *4 4

L 0 N.J 4c .0 4-454 0*U 044,

00

O £0

414

4No

0£

zx

00

X Li

1 - 4 :'O 3

0-00 It 4t

0L

LC 0. 0 -jZx0 ow

Ch. al.

14 0. Z x -93.

-j -j 490 .00 b

C4 z-* - A

922

4 Ix 09 La z. .4 4 I

~~.J Co~~~ - A- 10X 0 .

0~~~Z 0

-0 0- B

cc 00

I 1, -- 0.

L N2 N)

ac

-j w

141 ~ ~ ~ ~ C 4Z00 . -* f

C41

40 1 haa. UI M 9

410X2 41 41 0

1 . . 4 41.* 41 e 0

410 .04 c1 I - 1 0 z1

c ft L & a1 . 41

X

C-2 41.JW 410W on

ON-

V 1 0A4 1 A4

oj 0

2 0

0 C5

0 00

- 0 ).- x

a. 0

4a W9 s 0 '4 9

x * -

*~ ~ WO4 -4 ~0000

ac ODV -.I. P

4 u-.' 4.l

in .

o L) Ic s

N * ~ 0 0 M.2

0. 44

a.i 00

0 0400~0 00.4

ft 0 00

*'i A. 4z

No

~~~~ -z 0.i*

a 02co c %C x it

L oa L..a *z, -- 2102 =

~J9 0 ~ 4 9 X0~0 00 a. .4

-0 000,00

FA x

Co . - x Wl

n40. 14 - x 4 4Li) 00 f -x

0) I. 04 z2 a.

0= 0 ZO V.)

Lim w. NN -I0

IC La MU ar L0!Z

0~ ~~~ 114- ='~lLaw. *.& - -i U) V 0 ;nloIw4a.J l 0 !tLam. W

4 0 .8 ::~ . - -;n a 4O N IV c W'

11,- 0 00

M v3

E Cl' '44 4 .JI 9II-O w , * 4 w ~ In N P

a: 0 a,.- 4 w 4 ja -4

Is .4 x a aXL

' 0 044 0 m~

).fl. z WO 0n )x 0

1- a

0 z 4 0 .4

WO - 3 a: =Iz 0 0X- v 014 O O.'10

J La N0 - , a a-w0.CO

'.01 * - 0 cc(W

*~~~~4 a'. 0w)0 - -j

4w z

0C4 Z

0~4 loxI1W

-' 0. z '~h 43ZT9 W01 )-1 w

*~~ w En' * 004w I-

IL 0 0 .j494 or 1-1 0*W

.1 1 *

APPENDIX 4

PERTINENT DATA

1. Letter from Harold E. Pellow & Associates, Inc. to the Department ofEnvironmental Protection, New Jersey.

2. Pertinent data from Dam Application File, NJ DEP.

3. Hydraulic/Hydrologic computations by Soil Conservation Service 1969.

I

-A z

HAROLD E PELLOW & ASSOCIATS Y :

COSUIN.1Ik JV42 071 67-4

A4~~ Ar24, 1973

Mr. Dirk C. llofman. P. E.Cbie. Bureau of Water ControlDepartment of Enviornmntal. ProtectionDivision of Water ResouircesTrenton. New Jersey 08625

Re: Lake Ashroe Damn Application No. 612

Dear Mr. Hofrnan:

In reference to your letter dated March 26. 1473 relative to the* subject matter. I make the following comments-

1. The foundation of the darn wan not inspected by a representativeof your division due to an oversight on my part.

2. The embankment area was stripped of all topsoil and organicmaterial which ranged in depth from 6 Inches to 15 Inches.

3. The cutoff trench was excavated to bedrock an show, on theprom.o of the dam. AUl loose rock wasn removed from the bottom of th& H~f trenchbefore It was baclcfilfld with SM macerial from the Borrow Area "" L "

used the most Impermeable material from this Borrow Area No .4.Lt ba&L ULAgth, cutoff trench including some CL material.

4. The foundation for the embankment consisted mainly of SMmaterial with some CL and SP areas. This area was then compacted with avibratory compactor prior to placing of any fll.

S S. Th SS at"id consisted mainly of SM matfortWwat obtal.ed from Borrow Areao

sa qetlo you wniht hav Cam"04ncomedced by this aversighL.

~~ Tory "uy yours,

cc! Kenneth W. Davis

- ;.iv

A ~ -~

se --n 2'. snentril J'ir~..; t vns. 453 765oft t. .- *

- r ~ V . i'LX. i:7,'co~f,ut as suprosed to 53 3eex4

i r :;r ~. ~ r, )r uf 'A . . - id~.'rd !a.n

A.A. - . . t.Z- ,' . . L't ab LV)'k, 1 w rzu. t 14" a utewnt is o~i

S.-. . -1 -red b;' 2-3 ret. i ~L g1k and C

* .. .. * -- ~ .. a. ri~L, .~pa~ofIjw thr-.%4h Lhe. mnarkt.4m is

IL J , .-. & V c'

I-9

V'OfK S'mEET he

Watershed State -___C~uaity -qeservoir N.

Oraiag. reaAcres /sq. MI. Class_______

Weighted Curve Number(2) (3)F

Soil Complex (Lan~d Use) Carplec No. Acres (3) X (4

__ __ i . **. d e

WeChted Curve I'-7

VeIChted Curve III _______________

1I (2) 1 (3) 1 (4)~ ( 1 -(6) f-)-- (8)Eie,. !Ccsc. of course ILength(l) Sl ope jHwdra. jn W Ve, of TimI1E' r-.nrg ei of Rurncff %ater. Of of I~u cau~rf sc)~

r3Iis 'Coaj iejru f (S-'ahase~ft)folrse; IJvate r "v) (0)'(0)

Tc I -.a

______ x 3900

* I10

-4.L

/o -?

7f/~' ," ,.'' H5

7e /. 4 ./O

?I

7Y AV O4 Sf

fj A ~I A/. 41dC

cc 19 C

£2~ f [,I;z I I~

1- 6pIwe

0 i '

PL-

k'~~1 '' i - 1tj;j

ta I

;, ,*~ _ I ..

at Q Li g* W ' ~ ~ -Qr ~I

cc w

P) I, .

I

.. p 1 ii.o

Ls

-~i >a F 111m___________

LL -

444-

-A,

o0c

6" 0

ci j 4

.1iL

49 Z

toj 0 . 000000

ob Wl 0f -4

oro 00 0 0

2 4 II 0

4j am16

.... ...*

A -~

~, .1'S 'SN

* N4 ~ V.4 4 9

* .4 .4ii!4 . . 0 *

- g 4 ~ 3 * 0* - N

I * ,~

(I j':.44

I 4* 4

7*.i c 90

.. :

40 4

4 ~ 42 e 0 0

d 4 N. 0 .~

.J ~ .4 0 0

* 0 4'S ~

4 X 44

- 0 04 * S

0. c~ 0 4 0- .4 ~ p.

- z -. -~ ~4 IU 4B. ~* 4

4 4~ w 4

Li ~*~ 2 4- - ~4 . . .4 ~4 C ~ 4N * *4 N 9

2 04 4 -S. 4

~ b~ 4* ma

.,h', U~ 6 4U U 4uJ w 4-, aT 0. * *

w V~4 j - N £2 P ~

* w 04 ~' -2

4-1 4* - 4

4 42 42 ~4 * 6 0 04 * I%44 0 ~ NO *

5, @4 M% 9

.' 4 * 04 -Vt 4

a. 4aT 4

5~

A 4 4 ~.

'.1 * 4 * ~ * 'S 'S

-~ 0 604 Ci V N 0

.4 ~

4 04 U~444

. 4

444444444

1?~ u., ui C 0 0 0 - . * t ~j*~aT. 0 ~ 0 ~' ~

0 ~ ~ 0 * *'*

C C d~

5,

*s'S -- -

KA $41 w 6? U I DEPAR1~tNT Or WICULT14

24 U f f f flO Ad4j' -J5L -sk A 4 J'/o

Ac. ____ zc .0 A . ,*, AC

ov .14

4 % ' _ _ . ~ ____ _ _ - _ _ _

c ~ ~ !LLX8J~ doe

4~ ~ - -- - - _____ --- 1- - -- C

.4 j __ _Iol~LL4 L : - -I I I

- F -- - ______ _____ -SZ.

*~~~~& pip.C .LL ' __

I L . -.-4,- -~~S 4--1b.- -- '----t-

* pAWTIOST of iaS~cmy.uw*5 A A W! i !

Z. /~" .Ac. I" Ac jD" Ac.

, - -" - -

I, .' " -"'.'2 .,.f i.,. . 0 C.// ,6.4 - -

-- .... " . L A . . . I

.. ..,_ __-_ _____

4 -4- _ _ -- . .. ..

-. L 4" Af&" -40

S .- -- _

I-

_._ .. - ,. t9•

- '--- -+""

* I

a. a 040 a 0 'tgo % tv-4 o 40. S O .4'r - 0.r4 r ' 91 4 % - A

a P444IIcp ^W %zK4--- z e

uj 0ko ,a p aC,&aC l&&vo

me IL

g1 4no WN& m CiO a ~-fNO or 2. ~~ iNO~ 4

IL .4

9L c44C ; o 0 g

4 N4 vV r a p0 PC -01 0-

a, a

ImI

lidig

.*OL

APPENDIX 5

REFERENCES

2w Z

APPENDIX 5

REFERENCES

1. Brater, Ernest F. and Kings, Horace W., Handbook of Hydraulics 5th Edition,McGraw-Hill Book Company 1963.

2. United States Department of Agriculture, Soil Conservation Service, Somerset,N. 3. Urban Hydrology for Small Watersheds, Technical Release No. 55 January1975.

3. United States Department of Commerce Weather Bureau, April 1956,Hydrometeorological Report #33, Washington, D.C.

4. United States Department of Interior, Bureau of Reclamation Design of SmallDams, Second Edition 1973, Revised print 1977.

5. United States Department of Agriculture, Soil Conservation Service, Soil Surveyof Sussex and Morris County, August 1975.

6. United States Army Corps of Engineers, Flood Hydrograph Package (HEC-l),Davis, Calif. September 1978.

7. United States Department of Agriculture, SCS, A Method for Estimating Volumeand Rate of Runoff in Small Watersheds, SCS-TP-149, Revised April 1973.

8. United States Army Corps of Engineers, Recommended Guidelines for Safety

Inspection of Dams, Washington, D.C.

9. Sauls, G. A., Additional Hydrology and Hydraulics Guidance, 12 September 1978.

10. Dam Application File No. 612, Lake Ashroe, New Jersey Department ofEnvironmental Protection.

11. Plans: Pond and Dam Plans, Sakawawin Scout Reservation, Middlesex Council,Boy Scouts of America, Sussex County, New Jersey, Drawing No. NJ-01-726,United States Department of Agriculture, Soil Conservation Service, Dated 1969.

....

_ ,, . . -.

I

ILE1

EEEEEEEEEIIIJEEi DAM SAFETY PROGRAM. LAKE ASHROE DAM … · NATIONAL DAM SAFETY PROGRAM. LAKE ASHROE DAM (NJOOC23) ... I , Iowing remedial actions should be initiated withio twelve

Documents