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LOCATION--Lat 42o12'40", long
70o55'47", Norfolk County, Hydrologic Unit
01090001, on Whitman's Pond Dam, approximately 1,000 ft upstream
from Iron Hill Dam, and 1,300 ft upstream from Whitman's Pond
Outlet gage below Iron Hill Street, at East Weymouth, MA.
DRAINAGE AREA--12.4 mi2.
PERIOD OF RECORD--January 2002 to current year.
GAGE--Data Collection Platform with satellite telemeter. Stage sensor is attached to lower retaining wall of Whitman's Pond Dam and is located in Iron Hill Pond. Datum of Iron Hill Pond gage is 61.12 ft above Town of Weymouth datum. Subtract 5.83 ft from gage height values to adjust to National Geodetic Vertical Datum of 1929.
REMARKS--Flows affected by withdrawals for public water supply of Weymouth. High flows affected by diversions to flood by-pass system at Iron Hill Dam. The Old Swamp River gage (01105600) is located 0.4 mi upstream from Whitman's Pond, South Cove, and points of water withdrawals and diversions.
COOPERATION BY--Town of Weymouth, MA
FLOOD BY-PASS SIPHON INFORMATION--The flood by-pass system includes four siphon openings located at Iron Hill Pond Dam which are designed to by-pass flood flows around the Iron Hill Pond Dam fish ladder directly to the flood by-pass system. By-pass flood flows discharge to the inter-tidal zone downstream of Jackson Square. The following list shows the bottom elevations for each set of four siphon openings. Siphon Unit 2 is the first unit to by-pass flood flows.
Iron Hill Pond Dam--flows by-pass Iron Hill Pond fish ladder and enter flood by-pass system when Iron Hill Pond elevation exceeds the following siphon inlet elevations (Town of Weymouth Datum, in feet):
|Siphon Unit 2||65.25|
|Siphon Unit 3||65.35|
|Siphon Unit 1||65.45|
|Siphon Unit 4||65.55|
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