HOP BROOK DAM

HOP BROOK - Naugatuck River Watershed - Middlebury, CT

DRAINAGE AREA: 16.4 sq.mi.

PERMANENT POOL: 21 Acre Recreation Pool
Stage = 18.5 Ft (310.5 Ft NGVD)

DAM
Type: Rolled earth fill
Length: 520 Feet
Top Elev = 381.0 Ft NGVD (89 Ft)

FLOOD CONTROL STORAGE
Capacity: 6,850 Acre Feet
7.86 Inches of Runoff
Area at Crest: 270 Acres

CONTROL WORKS
Type: Rectangular Concrete Conduit
Size: 3'W x 5'H
Length: 425 Feet
Invert Elev = 292.0 Ft NGVD
Capacity (Full Pool): 600 cfs
Gate (Type): Hydraulic Sluice
Number: 2
Size: 3'W x 4'H
Channel Capacity = 550 cfs
Weir Elevation (top of logs) = 310.5 Ft NGVD (18.5 Ft)

SPILLWAY
Type: Chute Spillway broadcrested weir
Length: 200 Feet
Elev = 364.0 Ft NGVD (72 Ft)

SPILLWAY DESIGN FLOOD

Original Design Criteria:
- Rainfall Excess = 23.8 inches
- Initial Pool Level = 6" of F.C.
- Flood Control Outlet Gates = Operable
- Peak Inflow = 26,400 cfs
- Peak Outflow = 23,400 cfs
- Max. Pool = 376.0 ft-NGVD
- Freeboard = 5.0 ft
Current HMR 51 & 52 Criteria:
- Rainfall Excess = 32.5 inches
- Initial Pool Level = Full
- Flood Control Outlet Gates = Operable
- Peak Inflow = 44,100 cfs
- Peak Outflow = 33,430 cfs
- Max. Pool = 379.3ft-NGVD
- Freeboard = 1.7 ft

RECREATIONAL FACILITIES: 140 Picnic tables with grills, beach, parking areas, bathrooms, multipurpose athletic fields, overlook area, and three picnic shelters.

TOTAL COST: $5,500,000

PLACED IN OPERATION: October 1968