Barragem de Poilão is a dam located in the eastern part of the island of Santiago, Cape Verde, in the municipality of São Lourenço dos Órgãos. It impounds the stream Ribeira Seca, the island's largest river.^[1] the reservoir, used for irrigation, stretches between the villages Poilão and Levada. North of the reservoir is the national road from João Teves to Achada Fazenda (EN1-ST03).

Quick Facts Location, Coordinates ...

Barragem de Poilão
The reservoir and the dam of Poilão
Barragem de Poilão
Location	São Lourenço dos Órgãos, Santiago, Cape Verde
Coordinates	15.0757°N 23.5540°W / 15.0757; -23.5540
Type	Reservoir
Primary inflows	Ribeira Seca
Primary outflows	Ribeira Seca
Catchment area	28 km2 (11 sq mi)
Basin countries	Cape Verde
Max. length	1.23 km (0.76 mi)
Surface area	17 ha (42 acres)
Max. depth	18 m (59 ft)
Water volume	1.2×10^6 m3 (42×10^6 cu ft)
Surface elevation	118 m (387 ft)

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The brick dam was completed in July 2006. Its maximum length is 1,235 m, and its maximum surface area is 17 ha. Its surface level is 118 m above sea level, and its depth at the dam is 18 m. Its volume is 1.2×10^⁶ m³ (42×10^⁶ cu ft). The island has a dry climate with occasional torrential downpours. These cause the transport of large quantities of sediment into the reservoir and a study has found that between 2006 and 2013, the storage capacity of the reservoir has been reduced by almost one half.^[2]

• List of buildings and structures in Santiago, Cape Verde