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