AD-Ri54 498 NATIONAL PROGRAM FOR INSPECTION OF NON-FEDERRL DRMS 1/1BIGNEY POND DAM (HA 9..(U) CORPS OF ENGINEERS MALTHAMN A NEW ENGLAND DIV DEC 78

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Bigne Pon DamINSPECTION REPORT

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DEPT. OF THE ARMY, CORPS OF ENGINEERS December 1978NEW ENGLAND DIVISION, NEDED 13 NUNIERftOF PAGES

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Is. SUPPLEMENTARY NOTES

Cover program reads: Phase I Inspection Report, National Dam Inspection Program; '

however, the official title of the program is: National Program for Inspection ofNon-Federal Dams; use cover date for date of repo~rt.

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DAMS, INSPECTION, DAM SAFETY,Massachusetts-Rhode Island Coastal Basin 4.

Brockton, MassachusettsDorchester Brook

20. ABSTRACT fConl~n.e on reee aid@ Of nec.essr avd 1~0ir 6 bloc nuGAmmA,)

-Bigney Pond Dam is formed by an approximately 180 ft. length of earthembankment confined by vertical stone masonry retaining walls about 11ft. high. The Lam is In good condition. It has a low hazard potential ' '

and is small in size. The city of Brockton should implement remedialmeasures.%

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MASSACHUSETTS -RHODE ISLAND COASTAL BASIN ..

* BROCKTON, MASSACHUSETTS

BIGNEY POND DAM

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PHASE I INSPECTION R~EPORT

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DEPARTMENT OF THE ARM(YNEW ENGLAND DIVISION, CORPS OF ENGINEERS - '

WALTHAM, MASSACHUSETTS

DECEMBER 1978

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PHASE I INVESTIGATION REPORTNATIONAL DAM INSPECTION PROGRAM

Identification No.: MA 00422

Name of Dam: Bigney PondTown: BrocktonCounty: PlymouthState: MassachusettsStream: Dorchester BrookDate of Site Visit: 4 October 1978

BRIEF ASSESSMENT

Bigney Pond Dam is formed by an approximately 180 ft.length of earth embankment confined by vertical stone masonryretaining walls about 11 ft. high. The crest of the dam isTorrey Street, a paved secondary road. A 7 ft. long spillwayoutlet structure with provisions for 9 ft. of flashboards con- .trols flow through the dam. A culvert located about 300 ft. left -of the spillway would convey some overflow from the pond under . .Torrey Street. Bigney Pond has a maximum storage capacity of12 acre-feet and is used for recreational purposes. .

Bigney Pond Dam was formerly classified as having a .-. ?.

"high" hazard potential on the Corps of Engineers NationalInventory of Dams. Due to the lack of downstream development,however, the dam has been reclassified as having a "low" hazardpotential in the event it were to fail. ..... o-

The dam is in good condition, based on visual examinationof the structure. Although some deficiencies were noted, therewas no evidence of settlement, lateral movement or other signsof structural failure or other conditions which would warranturgent remedial action.

Based on size (small) and hazard (low) classifications inaccordance with Corps of Engineers guidelines, the test floodfor this dam is the 100-year flood. The test flood outflow of *:

1180 cfs (255 csm) would not overtop the dam itself, but wouldovertop a 185-ft. long section of Torrey Street in the vicinityof the culvert by an estimated maximum depth of 1.2 ft. Withthe water level at the test flood pool, the spillway outletwithout flashboards can pass 580 cfs which is 49 percent of thetest flood outflow. r .

The City of Brockton, owner of the dam, should implementremedial meesures, including clearing brush and trees, repairingmasonry and concrete and renovating the timber railing as outlinedin Section 7.3 within two years after receipt of this report.

HALEY & ALDRICH, INC. "° ' ',\by:

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Harl Aldrich /STEPresident

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PREFACE

This report is prepared under guidance contained in theRecomended Guidelines for Safety Inspection of Dams, forPhase I Investigations. Copies of these guidelines may beobtained from the Office of Chief of Engineers, Washington,DC 20314. The purpose of a Phase I Mnvestigation is toidentify expeditiously those dams which may pose hazardstohuman life or property. The assessment of the general condi- ,tion of the dam is based upon available data and visual inspec-tions. Detailed investigation and analyses involving topo-graphic mapping, subsurface investigations, testing, and .-detailed computational evaluations are beyond the scope of aPhase I Investigation; however, the investigation is intended -to identify any need for such studies.

in reviewing this report, it should be realized that thereported condition of the dam is based on observations of fieldconditions at the time of inspection along with data availableto the inspection team. In cases where the reservoir was low-ered or drained prior to inspection, such action, while improv-ing the stability and safety of the dam, removes the normalload on the structure and may obscure certain conditions whichmight otherwise be detectable if inspected under the normaloperating environment of the structure- "

It is important to note that the condition of a dam depends __

on numerous and constantly changing internal and external con- IVditions, and is evolutionary in nature. It would be incorrectto assume that the present condition of the dam will continueto represent the condition of the dam at some point in the .--.-future. Only through continued care and inspection can therebe any chance that unsafe conditions be detected.

Phase I Investigations are not intended to provide detailedhydrologic and hydraulic analyses. In accordance with theestablished Guidelines, the test flood is based on the estimatedprobable maximum flood' for the region (greatest reasonablypossible storm run-off), or a fraction thereof. Because of themagnitude and rarity of such a storm event, a finding that aspillway will not pass the test flood should not be interpreted .as necessarily posing a highly inadequate condition. The testflood provides a measure of relative spillway capacity andserves as an aide in determining the need for more detailedhydrologic and hydraulic studies, considering the size of thedam, its general condition and the downstream damage potential.. ..

The Phase I Investigation does not include an assessment

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of the need for fences, gates, no-trespassing signs, repairs ... -

to existing fences and railings and other items which may be "-<. -.. :needed to minimize trespass and provide greater security for "'---the facility and safety to the public. An evaluation of theproject for compliance with OSRA rules and regulations is alsoexcluded.

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TABLE OF CONTENTS

Page No. .

LETTEZR OF TRANSMITTAL ,A /

BRIEF ASSESSMENT i1REVIEW BOARD SIGNATURE SHEETPREFACE iTABLE OF CONTENTSOVERVIEW PHOTO viiLOCATION MAP viii

SECTION 1 - PROJECT INFORMATION1.1 GENERAL11.2 PROJECT DESCRIPTION 21.*3 PERTINENT DATA 3

SECTION 2 - ENGINEERING DATA2.1 DESIGN RECORDS 72.2 CONSTRUCTION RECORDS 7,2.3 OPERATION RECORDS 72.4 EVALUATION .7

SECTION 3 - VISUAL EXAMINATION3.1 FINDINGS 83.2 EVALUATION 10

SECTION 4 -OPERATIONAL PROCEDURES4.1 PROCEDURES 14. 2 MAINTENANCE OF EMBANKM~iENT 114.3 MAINTENANCE OF OPERATING 11

FACILITIES4.4 DESCRIPTION oF ANY WAjRNING 11

SYSTEM IN EFFECT.4.5 EVALUATION 11

SECTION 5 - HYDRAULIC/HYDROLOGIC5.*1 EVALUATION OF FEATURES 12

SECTION 6 - STRUCTURAL STABILITY .'5

6.1 EVALUATION OF EMBANKENT 14STRUCTURAL STABILITY

6.2 EVALUATION OF SPILLWAY 14STRUCTURAL STABILITY:: .

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TABLE OF CONTENTS (Continued)

Page No. .

SECTION 7 -ASSESSMENT, RECOMMENDATIONS ANDREMEDIAL MEASURES .-

7.1 DAM ASSESSMENT 167.2 RECOMMENDATIONS 16 ""'7.3 REMEDIAL MEASURES 167.4 ALTERNATIVES 17

APPENDIX A -INSPECTION TEAM ORGANIZATION ANDACHECK LIST

APPENDIX B -LIST OF AVAILABLE DOCUMENTS ANDPRIOR INSPECTION REPORTS -

APPENDIX C -SELECTED PHOTOGRAPHS OF PROJECT

APPENDIX D -OUTLINE OF DRAINAGE AREA ANDHYDRAULIC COMPUTATIONS

APPENDIX E -INFORMATION AS CONTAINED IN THENATIONAL INVENTORY OF DAMS -

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PHASE I INVESTIGATION REPORTNATIONAL DAM INSPECTION PROGRAM

BIGNEY POND DAMMA 00422 .-

SECTION 1 - PROJECT INFORMATION

.1 GENERAL

A. Authority. Public Law 92-367, August 8, 1972,uthorized the Secretary of the Army, through the Corps ofngineets, to initiate a National Program of Dam Inspectionhroughout the United States. The New England Division ofhe Corps of Engineers has been assigned the responsibility,f supervising the inspection of dams within the New Englandegion.

Haley & Aldrich, Inc. has been retained by the Newngland Division to inspect and report on selected dams inhe State of Massachusetts. Authorization and notice to -.

,roceed were issued to Haley & Aldrich, Inc. under a letterated 26 April 1978 from Colonel Ralph T. Garver, Corps of'ngineers. Contract No. DACW33-78-C-0301 has been assignedy the Corps of Engineers for this work. Camp, Dresser &IcKee, Inc. was retained as consultant to Haley & Aldrich,nc. on the structural, mechanical/electrical and hydraulic/ydrologic aspects of the Investigation.

B. Purpose. The primary purposes of the National Dam.nspection Program are to:

1. Perform technical inspection and evaluation ofon-Federal dams to identify conditions which threaten theiublic safety and thus permit correction in a timely manner Siy non-Federal interests.

2. Encourage and prepare the states to initiate quickly!ffective dam safety programs for non-Federal dams.

3. To update, .verify and complete the National Inven- .ory of Dams.

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.2 PROJECT DESCRIPTION

A. Location. The embankment for Bigney Pond dam is Torreytreet, located at the southern tip of Bigney Pond about one-halfile west of Route 24 in Brockton, Massachusetts, as shown on the .:cation Map, page viii. Discharge from the dam is conveyed byDrchester Brook southward.

B. Description of Dam and Appurtenances. Bigney Pond dams formed by an approximately 180-ft. length of earth embankmentDnfined by vertical stone masonry retaining walls about 11 ft.igh. These walls have a reinforced concrete cap and timber rail-ag. The crest of the dam is 48 ft. wide. The Torrey Streetavement runs the length of the crest.

A 7-ft. long spillway outlet structure with guide slots forlashboards up to 9 ft. in height is located on the upstream sidef the dam. Discharge over the spillway passes through a 9.5-ft.ide by 6.2-ft. high rectangular conduit under Torrey Street.

Left of the spillway outlet, along the edge of the pond atormal water level, there is an earthen ridge containing some .oulders, the top elevation of which is somewhat below the road-ay level. Water overtopping this ridge would flow eastwardhrough the woods before it would cross underneath Torrey Streethrough a 7.75-ft. wide by 3.5-ft. high overflow culvert approxi-ately 300 ft. east of the spillway outlet.

The configuration of the dam and appurtenances is shown onhe "Site Plan Sketch", Appendix C-1.

C. Size Classification. Bigney Pond has an estimated maxi-um storage of 12 acre-feet and the dam embankment has a maximumeight of approximately 11 ft. Storage of less than 1000 acre-eet and a height of less than 40 ft. classifies this dam in thesmall" size category, according to guidelines established by theorps of Engineers.

D. Hazard Classification. Bigney Pond was formerly classi-ied as having a "high" hazard potential in the Corps of Engineers 0 Sational Inventory of Dams. However, dam failure analysis compu-ations, Ap9oendix D-16, which are based on "Guidance for Estima-ing Downs --- Dam Failure Hydrograph" demonstrate why this damas reclass, to a lower classification. Calculationshow that by t. ime the flows generated by a dam failure reachpoint 1300 ft. .vnstream of the pond, they will have been en-irely dissipated Lecause of the large amount of storage availablen this reach. There appear to be no structures which would beamaged by flood waters. A dam failure implies that a section oforrey Street would be washed out. However, since no loss of life

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SECTION 7 - ASSESSMENT, RECOMMENDATIONSAMD REMEDIAL MEASURES

1 DAM ASSESSMENT . •

A. Condition. The visual examination of Bigney Ponda revealed that the structure was in good condition.though there were no signs of structural failure or othernditions which would warrant urgent remedial action, severalnor deficiencies were noted.

Based on the results of computations included in Appendixand described in Section 5, the spillway is not capable ofssing the test flood, which for this structure is the 100-yearood. The test flood outflow of 1180 cfs (255 csm) would notertop the dam itself, but would overtop a 185-ft. long sectionTorrey Street in the vicinity of the overflow culvert byestimated maximum 'depth of 1.2 ft. With the water levelthe test flood pool, the spillway outlet can pass 580 cfs

ich is 49 percent of the test flood (with no flashboards in).

B. Ade5uacy of Information. A review of design andnstruction data is a highly desirable factor in developingthorough Phase I assessment. However, there was insufficientgineering data available for this dam to allow for such aview. The evaluation of the dam is therefore based primarilyvisual inspection, past performance and engineering judgement. P .

C. Urgency. The remedial measures outlined in Section3 should be undertaken by the Owner and completed within,o years after receipt of this report.

D. Need for Additional Investigation. Additional investi- I -_

.tion is not believed to be necessary at this time.

2 RECOMMENDATIONS

Not applicable.

3 REMEDIAL MEASURES

A. Operation and Maintenance Procedures. It is recom-!nded that the following work be undertaken by the Owner toirrect deficiencies noted during the visual examination:

1. Cut all brush and trees within the channel upstreamand immediately downstream of the overflow culvert.The channels should be cleared of all brush at leastonce each year.

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D. Post-Construction Changes. With the exception offlashboard area in the spillway, the observed type of con-ction for the spillway outlet and the overflow culvertar to be of the same vintage. The condition of the concretethe use of concrete at the flashboard area indicates thatportion of the structure may have been added after theinal dam was constructed or that the area has been rehabil- . -.ed.

E. Seismic Stability. A theoretical analysis for seismicility of the spillway and overflow culvert outlets is notible due to the lack of pertinent design data. The outletslocated in a Zone 3 seismic risk area. Although the structuresquite small and appear to be in good condition with nocation of instability, it is not practical -o evaluate themic stability of the structures for the same reasons given,ection 6.1E.

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SECTION 6- STRUCTURAL STABILITY "

.1 EVALUATION OF EMBANKMENT STRUCTURAL STABILITY

A. Visual Observations. There was no visual evidence,f lateral movement or distress in the embankment retaining ' ..alls and no observed settlement or cracking of the pavement -n the crest that would indicate instability. .,

B. Design and Construction Data. No records or drawings O,elated to the design or construction of the embankment arevailable.

C. Operating Records. There are no records of surveyiins or other instruments installed in the dam to indicate thekagnitude and nature of any past structural movements. _ O

D. Post-Construction Changes. The year in which the damras constructed is unknown. There is no indication from prior.nspection reports that any changes to the dam have been made ,-,-.'.-iince 1937.

E. Seismic Stability. Bigney Pond dam is located in;iesmic Zone 3. The stability of the embankment during antarthquake is unknown. Settlement of the crest and cracking)r movement of the retaining walls are dependent on the back-ill soils present and the configuration of the walls. . ..

While a Zone 3 earthquake event would cause some shifting ------

n the backfill, subsequent settlement of the pavement, and .)ossible damage to the retaining walls, it is unlikely thelam would fail. Furthermore, this dam has a "low" hazard)otential and the pond elevation is normally low. For:-these"easons, a seismic analysis is not justified.

i.2 EVALUATION OF SPILLWAY STRUCTURAL STABILITY

A. Visual Observations. There was no visual evidence 6)f movement or distress in the spillway outlet or the overflowoulvert structures.

B. Design and Construction Data. A theoretical structural ..malysis of the outlet structures was not possible due to the.ack of pertinent data. The evaluation of the structuralitability of the outlets, therefore, must be based on the visual)bservations. .

C. Oprating Records. No operating records are known to .-....1xist for the spillway or culvert outlets.

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be overtopped for a length of approximately 185 ft. and to an -estimated maximum depth of 1.2 ft. Therefore, although thespillway alone is not capable of handling the test flood, incombination with the culvert, the dam can contain the test floodwith only a moderate amount of overtopping of the road.

E. Evaluation. The spillway is not capable of handling ,-.-.,the 100-year flood flows. A failure of the dam is not expectedto cause significant downstream structural damage and loss of -'- ,life. It appears that the only effect of a breach of the dam .-- .would be the local damage occurring to Torrey Street itself. ,

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SECTION 5 - HYDRAULIC/HYDROLOGIC

5.1 EVALUATION OF FEATURES

A. Design Data. No construction or record plans werefound for Bigney Pond dam. No hydraulic nor hydrologic designdata were found. The recommended test flood for the size (small)and hazard potential (low) of this dam is the 100-year frequency.

B. Experience Data. Mr. Sam Sergio, foreman, has beenwith the Brockton Highway Department since 1946. He does notknow of anyone ever removing or adding flashboards at theBigney Pond dam spillway. He believes that a section of TorreyStreet was overtopped once in the past 32 years, probably duringthe 1955 hurricane. The height of the flashboards then is unknown.

The "SCS TP-149, Method for Estimating Volume and Rate ofRunoff in Small Watersheds" was used as a guide for determiningthe inflow hydrograph into Bigney Pond for the 100-year storm(5.9 inches of rainfall in 12 hours). The peak inflow was cal-culated to be 1180 cfs. Because of the minute amount of storageavailable, the peak outflow is 1180 cfs at the pond water sur-face elevation of 107.85, about 2 ft. below the top of the dam.

C. Visual Observations. The inspection revealed that anearthen dike or ridge exists left (east) of Bigney Pond and ex-tends perpendicular to Torrey Street, approximately 200 ft. up-stream where it appears to blend in with existing ground. Thelow point of the dike is estimated to be at El. 106.7. Itappears that if the water surface of the pond rises to a value . . -greater than that of the dike, the waters would flow overlandin an easterly direction and be conveyed under Torrey Streetby a stone culvert located 317 ft. east of the centerline ofthe dam.

Downstream of the dam, a wide flood plain exists forapproximately 4600 ft. until Pearl Street crosses the brook.At this point there exists a moderate amount of residentialdevelopment as well as a U.S.G.S. Gaging Station No. 01107000,where flow records have been obtained since October 1962. .

D. Overtopping Potential. As stated previously, basedon the size (small) and hazard (low) classifications publishedin the Guidelines, the test flood is the 100-year storm. Arating curve for the dam's outlets (the spillway at the dam andthe overflow culvert) was developed and analysis demonstratedthat at a flow of 1180 cfs, the pond's water surface will beapproximately El. 107.85. At this elevation, the spillway willpass an estimated 580 cfs (with no flashboards in place).However, due to overflow eastward from the pond, the section ofTorrey Street which passes over the aforementioned culvert will

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SECTION 4 - OPERATIONAL PROCEDURES .. ' .

4.1 PROCEDURES w . .

There is no established routine for the operation of thedam. -

4.2 MAINTENANCE OF THE DAM -.

There is no established formal maintenance program forthis dam.

4.3 MAINTENANCE OF OPERATING FACILITIES .- -. -

With the exception of flashboards at the spillway out-let, this dam has no operating facilities. Flashboards areinserted or removed to establish a desired pond level. Approxi-mately 4.2 ft. of flashboards were believed in place during thesite examination. To the best knowledge of the Brockton ,Highway Department, the flashboards have not been operated inover 30 years.

4.4 DESCRIPTION OF ANY WARNING SYSTEM IN EFFECT

There is no established warning system or emergency -

preparedness plan in effect for this structure.

4.5 EVALUATION

A periodic observation and maintenance program shouldbe established to examine the dam, control tree and bushgrowth and maintain walls and channels. The Owner should beprepared to remove flashboards from the outlet structure ifnecessary.

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respectively. Downstream of Torrey Street, the channel invertcontains cobbles and vegetation. The banks and portions ofthe channel contain heavy brush and young trees.

3.2 EVALUATION

The dam and appurtenant structures are considered tobe in good condition, based on the observations made on 4October 1978. The minor deficiencies noted should not haveany serious effect on the performance of the dam.

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The overflow culvert structure consists of approachwalls and a culvert underneath Torrey Street, shown in PhotoNo. 9. Mortared stone masonry was used in the upstream anddownstream channel walls. The approach walls are constructedof what appears to be granite curbing mortared in place. Theupstream headwall and downstream headwall are constructed ofmortared fieldstone walls.

A portion of the stone appears to be missing on theleft upstream channel wall, Photo No. 9. Both upstream anddownstream fieldstone walls have local spots of efflorescence."" 'The concrete beam forming the top of the culvert on both theupstream and downstream faces also exhibits some minor ....-:efflorescence. The railing above both ends of the culvertneeds painting. Otherwise, the structure is considered to bein good condition.

Both the approach channel, Photo No. 8, and the down-stream channel of the overflow culvert structure have heavyvegetation present. These channels should be cleaned of treesand brush.

D. Reservoir Area. The area around Bigney Pond isalmost entirely wooded and the topography is relative flat, -.--Photo No. 10. The shallow bottom and marshy shoreline nearthe dam indicate some sedimentation has taken place. -

Ea Downstream Channel. A pond has formed immediately .downstream of Torrey Street due to the remains of an old damlocated approximately 100 ft. downstream of the main outletculvert. This dam, shown in Photo No. 11, includes a concrete --,-outlet structure on the left end with 5 or 6 planks in placein the flashboard slots. This dam, apparently in poor condi- Ation, is currently holding Bigney Pond at its present water ........surface elevation.

A stone wall, partially collapsed, is located right ofthe outlet of the old dam. The top elevation of this portionis perhaps 1 to 2 ft. below the crest of the concrete at theoutlet structure. To the right of the stone wall, there isa concrete block spillway about 12 ft. long which is also at-an elevation lower than the concrete at the outlet. Downstreamof the structure there are numerous fragments of broken rock,boulders, timber, logs, debris and other obstructions inthe downstream channel.

The overflow channel from the earthen ridge (dike) left ofBigney Pond to the Torrey Street overflow culvert is heavily . ..vegetated by brush, trees and grass, Photos No. 6 and 8, .

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SECTION 3 - VISUAL EXAMINATION

3.1 FINDINGS

A. General. The Phase I visual examination of the BigneyPond dam was conducted on 4 October 1978. The water level inthe pond was relatively low, approximately 2 ft. below thewater mark stained on the faces of the dam. .

In general, the project was found to be in good condi-tion. A few deficiencies which require correction were noted.

A visual inspection check list is included in AppendixA and selected photographs of the project are given in AppendixC. A "Site Plan Sketch", Appendix C-1, shows the layout of theproject and the location from which each photograph was taken.

B. Dam. Vertical fieldstone masonry walls form the * - .

upstream aii -Iownstream faces of the dam, Photos No. 2 and 3.The joints in the walls, especialy the lower joints, havestarted to deteriorate. Some minor vegetation was noted inthe joints. Several stones are missing from the upstreamface of the dam. Otherwise, the masonry facing for the dam isin good condition.

A concrete cap supporting timber railing is present atthe top of the masonry walls. Minor deterioration of the up-stream concrete cap was noted. Reinforcing bars were exposedfor approximately 15 ft. in a section of the downstream con-crete cap. Sections of the railing are broken on the upstreamside of the dam and the railings on both the downstream andupstream sides need repainting.

The crest of the dam is the paved Torrey Street roadway,shown in Photo No. 7. The road slopes downward to the east, atapproximately a 3 percent grade from Bigney Pond to the over-flow culvert. The pavement is in excellent condition, showingno signs of settlement, cracking, or lateral movement of theembankment.

C. Appurtenant Structures. The spillway outlet structureis constructed of mortared stone and concrete, Photos No. 4and 5. Minor vegetation was observed in the joints. The concretebeam over the upstream end of the culvert which forms the spill-way chute has some slight deterioration. The concrete guideslots are clear for insertion or removal of flashboards. Thetop plank of the 4.2 ft. of flashboards believed to be presentlyforming the spillway was visible 3 in. below the water surface. -""-.The spillway structure, in general, appears to be in good *-*' ---..condition.

8

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SECTION 2 -ENGINEERING DATA % %

2.1 DESIGN RECORDS

No design records are available for this dam. 4

2.2 CONSTRUCTION RECORDS

No construction records are available for this dam.

* 2.3 OPERATING RECORDS

The only operating records available are prior inspection *

e rports by state and county agencies dating back to 1937.

2.4 EVALUATION

A. Availability. A list of the engineering data avail-able for use in preparing this report is included in Appendix ~ ~B-1. Copies of the documents from the listing are also included .'A

in Appendix B.

*B. Pe A review of design and construction dataP is a highly es r le factor in developing a thorough Phase Igac 0

assessment. However, there was insufficient engineering data \***.

available for this dam to allow for such a review. The ~Y:\.*.evaluation of the dam is therefore based primarily on visual z§~ -

inspection, past performance and engineering judgement. ~w~

q C. Validitx. There is no reason to doubt the validityof the ava1iable data.

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6. Zoning ...................... Unknown7. Impervious core ............. Unknown8. Cutoff........................... Unknown9. Grout curtain ............... Unknown-

10. Other................. Crest is TorreyStreet roadway .'~

H. Diversion and Regulating Facilities. Not applicable. k**

I. Spillway-A;

1. Type......................... Concrete chute; spill-way is formed by addingup to 9 ft. of flash-boards

2. Length ofweir .............. 7 ft.3. Crest elevation.............. 98.7 with no flashboards

in place4. Gates........................ None (flashboards total-

ling 4.3 ft. in height* ~in place) .. *

5. U/S channel ................. Unknown6. D/S channel ................. 0.3 percent (Est.)

J. Regulating Outlets. There are no regulating gates forK.this facility. The upstream pond level is regulated by the addi- ~

* tion of flashboards at the spillway. The crest of the spillwaywithout flashboards is approximately El. 98.7. The use of themaximum amount of flashboards would raise the crest to approxi- -::

mately El. 107.7. The length of the area capable of receivingL% flashboards is approximately 7 ft.

6

3. Design~ surch~arge -origi.nal

design ....... .. .. .. .. .. . .. Unknown4. Full flood control pool ..... Not applicable5. Recreation pool............. Top of flashboards at

El. 102.9 on 4 October

6. Spillway crest 17(without flashboards) ..... 98.7 ,*I'

(vith flashboards) ........ 107.7 maximum -7. Upstream portal invert

diversion tunnel .......... Not applicable8. Streambed at centerline

of dam .................... 98.7

-9 Maximum tailwater ........... Unknown

D. Reservoir

1. Length of maximum pool ...... 0.13 mi.(Est.)2. Length of recreation pool... 0.13 mi. (Eat.)3. Length of flood control1

pool ....... . ... . ... .. . .. .. Not applicable

E. Storage (acre-feet)

1. Top of dam .... .......... .. .. 122. Test flood pool ............. 103. Flood control pool .......... Not applicable

5. Spillway crest

(without flashboards) ..... 0(with flashboards) ........ 8.5 maximum

F. Reservoir Surface (acres)

1. Top of dam ........ .. .. . .. . .. 3.22. Test flood pool ............. 3.1'3. Flood control pool .......... Not applicable4. Recreation pool ............. 35. Spillway crest

(without flashboards) ..... 0(with flashboards) ........ 3 maximum

G. Dam Embankment

1. Type .................... Backfill between twofieldstone masonryretaining walls

2. Length ......... .. .. .. .. .. . .. 180 ft.3. Height ...................... 11 ft.4. Top Width................... 48 ft.5. Side Slopes ................. Vertical

5

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..-.... •. I'

A. Drainage Area. The drainage area of Bigney Pond isapproximately 4.62 square miles (2957 acres). The pond surface -itself comprises an estimated 0.11 percent (3.2 acres) of thetotal drainage area. The watershed's topography is primarilyflat terrain with large portions of marshland along the courseof Dorchester Brook-

Dorchester Brook rises in a swampy area about 3 milesnorth of Bigney Pond in neighborin, Stoughton. After flowing -____through ?rench Pond and Monte Pond as well as swampy areasupstream of each, Dorchester Brook enters Bigney Pond after .which it combines with Daley Brook one mile downstream tobecome Coweeset Brook, a tributary of the Hockomock River.

V- Although several housing developments exist throughout theupper reaches of the watershed, overall development of thewatershed is moderate to sparse. Only sparse developmentsurrounds Bigney Pond.

B. Discharge at Dam Site

1. Outlet Works ................ No outlets other thanr spillway and overflowculvert

2. Maximum known flood atdam site since October1962 ...................... 359 cfs on 18 March

19683 3. Ungated spillway capacityat top of dam ............. 760 cfs at El. 110.0

4. Ungated spillway capacityat test flood poolelevation................. 580 cfs at El. 107.85

5. Gated spillway capacity %at normal pool elevation.. Not applicable

6. Gated spillway capacityat test flood poolelevation ................. Not applicable

7. Total spillway capacityat test flood poolelevation ................. 580 cfs at El. 107.85

8. Total project dischargeat test flood pool .-.elevation ................. 1180 cfs at El. 107.85

C. Elevation (ft. above MSL)

1. Top of dam .................. 110 (Assumed) .--2. Test flood pool - design " .":

surcharge................. Unknown•% -.."

* .,-.- ?<-.

W W W W 0 V W W IS W

would occur, nor significant damage to industrial, commercial,and residential structures, this dam should be reclassified ashaving a "low" hazard potential.

E. Ownership. The name and address of the current owner"~ are:

City of BrocktonDepartment of Public WorksHighway Division456 Montello StreetBrockton, MA 02401(Phone: (617) 587-9100)

The water rights and adjacent property are owned by the-- Young Men's Hebrew Association, 71 Legion Parkway, Brockton, MA

02401 (Phone: (617) 586-6404). The property was purchased in the* mid-1950's from the Stone Charitable Foundation, A 1937 inspection- report lists Mr. George W. Bigney as owner of the dam.

F. Oeerator. Mr. Timothy Sullivan, Superintendent, BrocktonHighway Division, is ultimately responsible for operation and main- .tenance of the dam.

G. Purpose. Bigney Pond is used during the summer monthsas a family recreation area operated by the Young Men's HebrewAssociation. However, no apparent attempt has been made to regu-late the pond level by use of the flashboards at the spillway out-let. On 4 October 1978, water level in Bigney Pond was very low,about 3 inches above one visible flashboard in the spillway. The

. water level was, in fact, being controlled by an old dam located- approximately 100 ft. downstream (south) of Torrey Street.

H. Design and Construction History. No information on theS design and-construction of Bigney Pond dam is available. The

Brockton Highway Department has no records of when the dam.wasconstructed. Presumably it has existed since at least 1900.

I. Normal Operational Procedures. There are no establishednormal operating procedures for this dam. The level of Bigney Pond " ,could be regulated by the insertion and removal of flashboards, but

. this has reportedly not been done for at least the past 32 years.

S..°,o .. "

1.3 PERTINENT DATA

In the absence of any datum information, the elevation of .. .the top of Torrey Street at the centerline of the spillway struc-ture was assumed to be 110 ft. (MSL) using the U.S.G.S. Brockton, "''Massachusetts quadrangle. All other elevations reported hereinwere measured relative to this assumed datum.

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E l+:,. .::2. Repoint the joints in the masonry as necessary and

replace missing stones.

3. Repair deteriorated concrete cap beams by removingall loose concrete and patching as necessary.

4. Repair broken areas in the railing and repaint allrailings.

Although the dam is currently in good condition, it isconsidered important that the Owner prepare an operations and -maintenance manual for the dam. The manual should includeprovisions for biennial technical inspection of the dam andfor surveillance of the dam during periods of heavy precipitation

-_ and high reservoir water levels. The procedures should delineatethe routine maintenance work to be done on the dam to ensuresatisfactory operation and to minimize deterioration of thefacility.

7.4 ALTERNATIVES

r Not applicable.

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VISUAL INSPECTION PARTY ORGANIZATION

NATIONAL DAM INSPECTION PROGRAM ..

Dam: Bigney Pond

Date: 4 October 1978

Time: 1145-1345

Weather: Partly Cloudy and Warm (60's F.)

Water Surface Elevation Upstream: El. 103.2 MSL I..* Stream Flow: Very slight through spillway culvert

Inspection Party:

Harl P. Aldrich, Jr. -Soils/Geology

Haley & Aldrich, Inc.Roger H. Wood -Structural/mechanical

Camp, Dresser & McKee, Inc.Charles E. Puller -Hydraulic/Hydrologic

Camp, Dresser & McKee, Inc.

Present During Inspection:

* Barry Koretz, Young Men's Hebrew AssociationRichard A. Brown, Haley & Aldrich, Inc.Donna L.B. D'Amore, Camp, Dresser & McKee, Inc.

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Ii VISUAL INSPECTION CHECK LISTNATIONAL DAM INSPECTION PROGRAM

DAM Biqney Pond DATE' 4 Oct. 78 ::.

pAREA EVALUATED CONDITION

DAM EMBANKMENT

1. General

- a. Crest Elevation 110.0, top of Torrey Street roadwayb. Current Pool-Elevation 103.2c. Maximum Impoundment Unknown, street has been overtopped

to date in past

2. Crest ',

a. Surface Cracks Noneb. Pavement Condition Excellent 1c. Movement or Settlement None apparent

of Crestd. Lateral Movement None apparent

. 3. Wall (Upstream Face of

,.Dam)

* a. Vegetation Minor vegetation growth in jointsb. Seepage or Efflores- None observed

cence 0 .c. Rust or Stains None observedd. Cracks None observed . .e. Condition of Joints Lower joints deterioratedf. Spalls, Voids or Several stones missing, some deter-

Erosion ioration of concrete cap" g. Visible Reinforcement None observed

h. General Structure Good conditionCondition C."

* -i. Railing Railing requires maintenance

4. Wall (Downstream Face ofDam)

a. Vegetation Minor vegetation growth in jointsb. Seepage or Efflores- None observed

cencec. Rust or Stains None observedd. Cracks None observede. Condition of Joints Lower joints started to deterioratef. Spalls, Voids or Deterioration of concrete cap

Erosiong. Visible Reinforcement Reinforcing bars in concrete cap

exposed in one 15-ft. section

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VISUAL INSPECTION CHECK LISTNATIONAL DAM INSPECTION PROGRAM "' "

DAM: Bionev Pond DATE 4 oct. 78

AREA EVALUATED CONDITIONPg - :.,' ".

h. General Structure Good conditionCondition

i. Railing Railing requires maintenance

OUTLET WORKS - SPILLWAYOUTLET, APPROACH ANDDISCHARGE CHANNELS

1. Approach Channel

a. General Condition Spillway adjacent to pond - noapproach channel

b. Obstructions Minor debris- some boulders adjacentto inlet

r c. Log, Boom, etc. None

2. Spillway Outlet

a. Flashboards Flashboards 7 ft. wide, 9 ft. highmax.

b. Weir Elev. Control Flashboards control height of pond(Gate)

c. Vegetation Minor vegetation lower portiond. Seepage or Efflores- None observed

cencee. Rust or Stains None observedf. Cracks None observedg. Condition-of Joints Good " .'" ""-h. Spalls, Voids or None observed

Erosioni. Visible Reinforcement None observedj. General Structural Good condition - see DAM EMBANKMENT

Condition Items 3 and 4 for condition of 0walls at face of dam

3. Discharge Channel

a. Apron Noneb. Stilling Basin Nonec. Channel Floor Area downstream is another pond with

its own damd. Vegetation None observede. Seepage None observedf. Obstructions None observed -dam downstreamg. General Structural Good

Condition

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VISUAL INSPECTION CHECK LISTN~ATIONAL DAM INSPECTION PROGRAM

*DAM' Bianey Pond DT : Ot 78

* AREA EVALUATED CONDITION *.

O UTLET WORKS - OVERFLOW

* 1. Aproach Channel

a. General Condition Fair, natural groundb. Obstructions Heavy vegetation

*c. Log Boom, etc. None

2. Weir

*a. Flashboards Noneb. Weir Elevation Control Flow over earth mound upstream

cVegetation Feavy vegetationdSeepage or Efflores- Minor

cencee. Rust or Stains None observedf . Cracks None observedg. Condition of Joints None observedh. Spalls, Voids or None observed

Erosioni . Visible Reinforcement None observed

*j. General Structural GoodCondition

3. Discharge Channel

a . Apron None observed -natural growthb. Stilling Basin None

*c. Channel Floor Natural groundd. Vegetation Heavy growth -brush with some treese. Seepage None observedf . Obstructions Vegetationg g. General Structural Fair

Condition

4. Left and Right ApproachWalls

*a. Vegetation Trees and brush overhangingb. Seepage or Efflores- Efflorescence downstream -minor

cence -%c. Rust or Stains None observed

2 d. Cracks None observed

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VISUAL INSPECTION CHECK LIST p

NATIONAL DAM INSPECTION PROGRAM

DAM' Bigney Pond DATE t4 Oct. 78

AREA~ EVALUATED CONDITION

e. Condition of Joints Good*f. Spalls, Voids or Stone missing on left wall \-

Erosiong. Visible Reinforcement None obser vedh. General Structural Good

Conditioni. Railing Needs maintenance and repainting

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COUNTY OF PLYMOUTH, MASSACHUSETTS DAmw No..Z "

ENGINEERING DEPARTMENT P.. 9.

INSPECTION Of DAM AND RUERVIRS

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* INSPECTION REPORT -DAMS AND RESERVOIRSL *1.Iain Citi/Tow Awoomeov Dam No.- a

Nam of Dam 81o/6&&X~ Pa. iya Inspected byd Z2Ur'.A&*.

Date of Inspect1onJ2AInZr

2. Owner/a: Per: Assessors...J.......rY. Inspectionl Iain 70

- - -* Re!g. of Deeds- Pers. Contact_________

Nam St.1 No0. City/Town Stats T*1..o

game 5t.& rio. Crf-M~own btats Ee.o.

3. Caretaker:(if any) e.g. superintendents plant -anager, appointedb 9balp e r, appointed by multi owners.

4. go. of Pictures ae-k.

5. Degree of Hazard: (if darn should fail completely)*

1. Minor_______________22

3. Sever________ 4. Disastrouq___._______*his rating may change as land use changes (future development)

6. Outlet Control: Automatic_______ Xanua1__ff.

Operative aes; _______No

Comments:___________________________

7. Upstream Face of Dam: Condition:

Conditions:

1. Good - 2.* minor Repairs________

3. Major Repairs 4.Urgent Repairs

Comments: .A...AU i S A7 A ~ . .

B- 4

* * ~ V U U V U S%%%

-2-DaNoIt8. Downstream Face of Dam: DmN .L ~I.

Condition: 1. Good________ 2. Minor Repar Z

3. Major Repairs _4. Urgent Repairs____

Coments: <z 4LS',, '~- - /71r,i -

9. Emergency Spillwax-.

Cond on:V d____ ___ 2. Minor Repairs________

3. Major Repairs 4k. Urgent Repairs______

* ~Comnts:___________________________

10. Water Level at Time of Inspection:

... L.L...t.above .below 6 _. top of dam____

principal slia .other

11. Summary of Deficiencies Noted:Growth (Trees & Brush) on Embankment I-C L&Animal, Burrows & Vasbouta Al.Damage to Slopes or Top of Dam A'Cracked or Damaged Masonry A sii1.Evidence of Seepage_______________________

Evidence of Piping A".Erosion__________________________.--.. -

Leeks *

Trash and/or Debris impeding Flow S SClogged or Blocked Spillway, A~Other

B- 5

-7..

-3- Dam No..4 Z 1

12.* Remarks & Recomendat ions: (Fully Explain)

13. Overall Conditlon:

1. Safe______________

2.* Minor Repairs Needed__________________

3. Conditionally Safe -.Major Repairs Needed________

1,. Unsafe________________________

5. Reservoir Impoundment no Longer Exists (explain)

Recoummend Removal from Inspection List__________

B- 6

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APPENDIX DouTLNE OF DRAINAGE AREA AND

i YDr xLIC COI4PVTATIKS,

page to .

nLZU or DRAGE awA ~~-~<

Drainage Area Map D-1

IPUATIONS

Size and Bazard Classification D-2Water Surface Area vs. Elevation Graph D-3Calculation of the 100-year and 50-year D-4

Frequency StormsOutlet Rating Curve Calculations D-10Dan Failure Analysis D-16

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DAN NO. 7-Z-

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A. Description of Present Land Usage Downstream of Dam: v, . .

.... ~.......% iwel44 urban **

B. Is there a storage area or flood plain downstream of dam whichcould accommodate ilp impoundment in the event of a completedam failbw. a.- s--- ______no

10. -

Risk to Life and Property in Event of Complete FailureNo. of People ..

.No. of Homes. , ./'r , . -

No. of Businesses ."'".-.

No. of Industries ***.j** Type____________

No. of Utilities g . Type -.. ,.

Railreads_ _ ,

Other

11.

Attach sketch of dam to this form showing section and plan on anx 11" sheet.

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DESCRIPTION OF DAM

DISTRICTZ~.~~ ... -.

Submitted Dam No. 7-r12 -

Date q C ity/ %

- Name of D

Location: Topo fheet No -.....

Provide 8j" x 11" in clear copy of tope map Vith locatinn of Dam --

clearly indicated.-

2.Year Bul Year/s of Subsequent Rearg =

Purpose of Damn: Water Supply___- Recreational______

Drainage Area,- .; --Mi Acres

Normal Ponding Area: ___Acres @_______v.Depth .'.

Impoundment: 4 _i Q~l._______Acre Ft.2.

6No. and Type of Dwelings Located Adjacent to Pond or Reservoir *jf

i. a . Summer Homes, etc Ze.. 4~ / -T 77,7 A..x2.T ~

7. .'dDimensions of Dam: Length/IZ- ... Max. Height /

Slopes: Upstream Face ;0-*Downstream Face wel

Width Across Top .'A

Classification of Dam by Material:

Earth Conc. Masonry ' .. Stone 1Mason. i.-

Timh~er - Rockfill O-het

a. . . . . .. . . . . . . . . . . . . ...

V-

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13.~& Ovrl Condition

I. Saf -.

2. hU~naz Roped"n Needed________________________

3. Condtion-"' Safe - Wrno Impairs Needed_____________

5. kmwir Impadsnt no l.ge WASa (ew1aln)

Raco0mmd Remova fram Inspection List .

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8.Datreaw Yam of Dust

Cor±t.ams 1. Goopd ' ~ 2. Minor Repair@ -

3. War mpmlm .. Urgen .e.d4

3. HaJor Repair_____- & UrentRepirn____ 4..... .f

- cami (Tram &. amh a. - Mz Ipas_________

10 ma ge . t Sl pe or Toapeof~ m -M

Cracked or Damaged .. *.

Iwldeno of Seep _ 'Ile.....

IvIdemoo of ftput__ .... ,.....d~-4

Trash ancRor DOU. Is Ipeding lw_ _______

Clogged or Bloc' . plwed.... . . ~ -

C~thr_______ __ __ _ ___ ____ ___

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