MICHÕES DAM

PURPOSE - Fire
LOCATION GENERAL FEATURES
District - Santarém
Municipality - Benavente
Site - Campo de Tiro de Alcochete
River Basin - Tejo
River - Vale de Michões river
Promoting entity - Força Aérea / Grupo de Engenharia de Aeródromos ( GEAFA)
Owner - Força Aérea / G. E.Aer. (GEAFA)
Engineering by - Engº Seco e Pinto
Project year - 1995
Year of completion - 1996
HYDROLOGY RESERVOIR
River basin area - 15,3 km2
Mean annual rainfall - 630 mm
Mean annual runoff - 1741 x 1000 m3
Flood runoff  - 49 m3/s
Return period  - 1000 years
Reservoir area   - 960 x 1000m2
Gross capacity - 1920 x 1000m3
Effective storage - 1770 x 1000m3
Dead storage  - 150 x 1000m3
Normal water level (NWL) - 27 m
Maximum flood level (MFL) - 27,55 m
Minimum operating level  - 23 m
DAM
Earthfill - Zoned embankment
Height above foundation - 15 m
Height above streambed - 10 m
Crest elevation - 29 m
Crest length - 325 m
Crest width - 6 m
Foundation - Sand and claystone
Volume of dam body
- 38,129 x 1000 m3
SPILLWAY BOTTOM OUTLET
Control type - Uncontrolled
Spillway type - Chute spillway
Sill elevation - 25 m
Sill length - 7 m
Maximum discharge - 6,1 m3/s
Energy dissipation - Hydraulic jump III USBR
Location - Thalweg
Type - Conduit under the embankment
Section - d 0,50m
Maximum discharge  - 1,2 m3/s
Upstream control  - Sluice gate
Downstream control  - Butterfly valve
Energy dissipation - Impact basin


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