GUILHOFREI DAM

PURPOSE - Hydroelectric / Recreation
LOCATION GENERAL FEATURES
District - Braga
Municipality - Vieira do Minho
Site - Guilhofrei
River Basin - Ave
River - Ave river
Promoting entity - HDN, Energia do Norte, SA
Owner - HDN
Engineering by - A. STUCKY
Construction by - Joaquim Moreira Ramalhão
Year of completion - 1938
HYDROLOGY RESERVOIR
River basin area - 122 km2
Mean annual rainfall - 2626,6 mm
Mean annual runoff - 17070 x 1000 m3
Flood runoff - 350 m3/s
Reservoir area   - 1630 x 1000m2
Gross capacity - 21200 x 1000m3
Effective storage - 21080 x 1000m3
Dead storage  - 120 x 1000m3
Normal water level (NWL) - 333,3 m
Maximum flood level (MFL) - 333,3 m
DAM
Type - Masonry and concrete gravity dam
Height above foundation - 49 m
Crest elevation - 337 m
Crest length - 190 m
Volume of dam body
- 55 x 1000 m3
SPILLWAY BOTTOM OUTLET
Location - Dam body
Control type - Controlled
Spillway type - Over the dam
Sill elevation - 330,6 m
Sill length - 18 m
Number of gates - 2 radial gates
Maximum discharge - 445 m3/s
Energy dissipation - Hydraulic jump
Location - Thalweg
Type - Through the dam
Section - D 2,0m
Upstream control  - Yes
Downstream control  - Yes
Energy dissipation - Stiliing basin
POWER PLANT
Type - Dam toe
Number of installed units - 1 Kaplan and 1 Francis
Power installed capacity - 4,6 MW
Mean annual energy output - 11 GWh


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