National Program for Inspection of Non-Federal Dams. Putnamville Reservoir Dam and Dikes (DAM (MA 00745), East Dike (MA 01297), West Dike (MA 00744), Ipswich River Basin, Danvers, Massachusetts. Phase I Inspection Report.
CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV
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Putnamville Reservoir was built in 1954 and is a pumped storage reservoir used for water supply. The reservoir is impounded by a 1,400-foot long dam, a 2,100-foot long dike on the east side and by a 700-foot long dike on the west side. Each of these structures is a zoned earthfill embankment with a reinforced concrete parapet at the top of the upstream slope. The parapets were added in 1978 when the elevation of the top of the reservoir was increased by 5 feet. A 360-foot long earthfill dike is also located on the south side of the reservoir. The spillway is a 30-foot long, modified ogee weir with the crest at El 79.8. The outlet is a 3-foot diameter prestressed concrete cylinder pipe that is also used to fill and drain the reservoir. The same deficiencies were observed at the dam, east dike, and west dike. These deficiencies are seepage along the downstream toe, a dense growth of brush and trees at the toe and in the downstream areas, inadequate riprap in areas along the top of the upstream slope, and animal burrows on the downstream slope. At the dam, additional deficiencies are the accumulation of rocks and debris in the spillway channel and stilling basin and the inadequate capacity of the low-level outlet. The only deficiency at the south dike is inadequate riprap on the upstream slope. The test flood outflow is 462 cfs, resulting in a reservoir level at El 82.3. The test flood would not overtop the dam or the dikes. Hydraulic analyses indicate that the spillway can discharge 960 cfs, or 208 percent of the test flood outflow before overtopping would occur.
- Hydrology, Limnology and Potamology
- Civil Engineering