LITTLEVILLE DAM

MIDDLE BR. WESTFIELD RIVER - Connecticut River Basin - Huntington, MA

DRAINAGE AREA : 52.3 sq.mi.

PERMANENT POOL 275 Acre Rec. & Water Supply Pool
Elev: 518.0 ft NGVD

DAM
Type: Rolled earth fill
Length: 1,360 Feet
Top Elev: 596.0 ft-NGVD

FLOOD CONTROL STORAGE
Capacity: 23,000 Acre Feet
8.3 Inches of Runoff
Area at Crest: 510 Acres

CONTROL WORKS
Type: Horseshoe conduit
Size: 8 Feet
Length: 374 Feet
Invert Elev: 486.5 ft NGVD
Weir Elevation (top of logs): 518.0 ft NGVD
Discharge Capacity at Full Pool: 2,000 cfs
Gates (Type): Motorized Sluice Gates
Number: 2
Size: 4' x 8'
Channel Capacity: 1,500 cfs

SPILLWAY
Type: Chute Spillway Ogee Weir
Length: 400 Feet
Elev: 576.0 ft-NGVD

SPILLWAY DESIGN FLOOD

• Original Design Criteria
  • Rainfall Excess: 22.4 inches
  • Initial Pool Level: Full
  • Flood Control Outlet Gates: Operable
  • Peak Inflow: 98,000 cfs
  • Peak Outflow: 92,000 cfs
  • Max. Pool: 591.0 ft-NGVD
  • Freeboard: 5.0 ft
  
  
• Current HMR 51 & 52 Criteria
  • Rainfall Excess: 26.2 inches
  • Initial Pool Level: Full
  • Flood Control Outlet Gates: Operable
  • Peak Inflow: 140,000 cfs
  • Peak Outflow: 136,500 cfs
  • Max. Pool: 595.1 ft-NGVD
  • Freeboard: 0.9 ft