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El Atazar Background


dam type: double curvature concrete arch buttress

purpose: water supply and regulation

height: 440 ft (134 m)

width at foundation: 171.6 ft (52.3 m)

length of crest: 1312 ft (400 m)

storage capacity: 344,000 acre-ft.

photo courtesy of Anthony R. Ingraffea


The dam may also have served the people by producing electric power, but the decision was made to confine its purpose to water supply.

location: near Madrid, Spain

river: Lozoya, very close to where it joins the Jarama River

foundation: Silurian shale

Three joint systems pass through this foundation.

construction start date: 1968

construction end date: 1972

first partial reservoir filling: 1970

Maximum storage is 870 m above sea level. Filling began when the diversion tunnel was closed. It filled to 824 m above sea level in 1971 and then to 860 m in 1972. Questionnable behavior began to occur during the filling between 1971 and 1972.

photo courtesy of Anthony R. Ingraffea


Operations were generally normal until 1977. The dam was monitored for thermal and hydrostatic effects.



El Atazar dam El Atazar problem