HANCOCK BROOK DAM (UNSTAFFED)
HANCOCK BROOK - Naugatuck River Watershed - Plymouth, CT
DRAINAGE AREA: 12 sq.mi.
PERMANENT POOL: 40 Acre Recreation Pool
Stage: 7 ft (461.0 ft NGVD)
DAM
Type: Rolled earth fill
Length: 630 Feet
Top Elev: 505.0 ft NGVD (51 ft)
FLOOD CONTROL STORAGE
Capacity: 3,900 Acre Feet
6.13 Inches of Runoff
Area at Crest: 266 Acres
CONTROL WORKS
Type: Rectangular Concrete Conduit
Size: 3' x 4'-6"
Length: 250 Feet
Invert Elev: 454.0 ft NGVD
Weir Elevation (top of logs): 461.0 ft NGVD (7 ft)
Capacity (Full Pool): 377 cfs
Gate (Type): Dewatering Gate
Number: 1
Size: 2' x 2'
Channel Capacity: 350 cfs
SPILLWAY
Type: Chute Spillway/broadcrested weir
Length: 100 Feet
Elev: 484.0 ft NGVD (30 ft)
SPILLWAY DESIGN FLOOD
- Original Design Criteria:
- Rainfall Excess: 22.8 inches
- Initial Pool Level: Full
- Flood Control Outlet Gates: Operable
- Peak Inflow: 20,700 cfs
- Peak Outflow: 16,600 cfs
- Max. Pool: 499.7 ft-NGVD
- Freeboard: 5.3 ft
- Current HMR 51 & 52 Criteria:
- Rainfall Excess: 32.2 inches
- Initial Pool Level: Full
- Flood Control Outlet Gates: Operable
- Peak Inflow: 33,100 cfs
- Peak Outflow: 22,000 cfs
- Max. Pool: 502.8 ft-NGVD
- Freeboard: 2.2 ft
RECREATIONAL FACILITIES: Trails, fishing, and hunting.
TOTAL COST: $3,700,000
PLACED IN OPERATION: July 1966