KNIGHTVILLE DAM

WESTFIELD RIVER - Connecticut River Basin - Huntington, MA

DRAINAGE AREA= 162 sq.mi.

PERMANENT POOL
Summer = None
Winter = 35 Ft

DAM
Type= Rolled rock and earth fill
Length= 1,200 Feet
Top Elev = 630.0 Ft-NGVD (150 Ft)

FLOOD CONTROL STORAGE
Capacity= 49,000 Acre Feet
5.6 Inches of Runoff
Area at Crest= 960 Acres

CONTROL WORKS
Type= One circular tunnel
Size= 16 Feet diameter
Length= 605 Feet
Invert Elev = 480.0 Ft-NGVD
Discharge Capacity at Full Pool= 14,500 cfs
Gates (Type)= Broome
Number= 3
Size= 6' x 12'
Channel Capacity = 4,500 cfs

SPILLWAY
Type= Chute Spillway Ogee Weir
Length= 400 Feet
Elev = 610.0 Ft-NGVD (130 Ft)

SPILLWAY DESIGN FLOOD

• Original Design Criteria=
• Rainfall Excess = 15.6 inches
• Initial Pool Level = Full
• Flood Control Outlet Gates = Inoperable
• Peak Inflow = 113,200 cfs
• Peak Outflow = 91,000 cfs
• Max. Pool = 625.0 ft-NGVD
• Freeboard = 5.0 ft
• Current HMR 51 & 52 Criteria=
• Rainfall Excess = 23.8 inches
• Initial Pool Level = Full
• Flood Control Outlet Gates = Operable
• Peak Inflow = 171,800 cfs
• Peak Outflow = 160,000 cfs
• Max. Pool = 630.3 ft-NGVD
• Freeboard = -0.3 ft

RECREATIONAL FACILITIES= Damsite picnic area, 10 picnic tables with grills, group picnic shelter and bathroom, two large group camping areas with Indian Hollow group Campground parking, bathroom, showers and drinking water.

TOTAL COST= $3,300,000

PLACED IN OPERATION= December 1941

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