Bokaa Dam

Type: Earthcore Fill Structure
Construction Date: 1990 - 1993
Location: Bokaa, Botswana
S 24.440068° E 26.019453°
Bokaa Dam, situated 20 km from Gaborone, Botswana, is a 14m high Earthcore Fill structures with a 1500m crest length. The structure is situated in the Metsimotlhabe river south of the Bokaa village complex.

Dam capacity is 18.5 million m³.

Since 2012 Bokaa Dam provides approximately 25% of the water supply for Gaborone and surrounding areas.

Bokaa Dam Instrumentation consists of the following:
  • Vibrating Wire Embankment Piezometers measuring pore pressure.
  • Vibrating Wire Settlement Cells in the earth embankment structure to measure settlement.
  • Vibrating Wire Pressure Cell.

Instruments installed in and around the Dam Embankment are intended to monitor:
  • Settlement of the Embankment;
  • Pore pressure build-up around the Conduit and Main Embankment.

Installed Instruments Specification:
Piezometers (Clay Core against Retaining Wall)
Geokon Vibrating Wire Model 4500S
Pressure Cells (Conduit and Main Embankment)
Geokon Vibrating Wire Model 4800
Settlement Cells (Fill)
Geokon Vibrating Wire Model 4650

Designers: N/A

Consulting Engineers: Water Utilities Corporation

Contractors: Botswana's north south carrier 2 water transfer scheme

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