CORGAS DAM

PURPOSE - Water supply
LOCATION GENERAL FEATURES
District - Castelo Branco
Municipality - Proença-a-Nova
River Basin - Tejo
River - Isna river
Promoting entity - INAG
Owner (RSB) - C M Proença-a-Nova
Engineering by - APAGEL
Construction by - Rigeral. Somague
Year of completion - 1991
HYDROLOGY RESERVOIR
River basin area - 25,3 km2
Flood runoff  - 140 m3/s
Return period - 1000 years
Reservoir area   - 110 x 1000m2
Gross capacity - 660 x 1000m3
Effective storage - 534 x 1000m3
Normal water level (NWL) - 543 m
Maximum flood level - 543 m
DAM
Concrete - Gravity dam
Height above foundation - 30 m
Height above streambed - 25,5 m
Crest elevation - 545,5 m
Crest length - 92 m
Volume of dam body - 13,039 x 1000 m3
SPILLWAY BOTTOM OUTLET
Location - Center
Control type - Controlled
Spillway type - Over the dam
Sill elevation - 539,5 m
Sill length - 11,5 m
Number of gates - 2 radial gates
Maximum discharge - 140 m3/s
Energy dissipation - Hydraulic jump
Location - Right bank
Type - Through the dam
Section - d 1,0 m
Maximum discharge - 11,9 m3/s
Upstream control - Sluice gate
Downstream control - Hollow jet valve
Energy dissipation - Hollow jet and scour holes


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