Ntimbale Dam, situated in the Tati River near Francis Town, Botswana, is a 34m high dam with two independent dam walls. The first, a Clay Core Rock Fill (CCRF) with a 175m crest length and the second is a Roller Compacted Concrete (RCC) dam with a crest length of 155m. This wall has a central OG spillway of 75m in length.

Main purpose of the dam is water supply to the villages in the north-eastern district of Botswana.

Dam capacity of dam is 26 million m³.

Ntimbale Dam Instrumentation consists of the following:

• Vibrating Wire Piezometers in the Clay Core and foundation measuring pore pressure.
• Vibrating Wire Vented Piezometers measuring lake level.

Instruments installed in and around the Dam Embankment are intended to monitor:

• Pore pressure build-up around the Conduit and Main Embankment;
• Lake level.

Installed Instruments Specification:

Piezometers (Embankment, Foundation)

• Geokon Vibrating Wire Model 4500S

Piezometers (Lake Level)

• Geokon Vibrating Wire Model 4500AL (V)

Single Channel Data Logger

• Geokon Model 8001 (LC 1)

Designers: Knight Piésold

Consulting Engineers: Knight Piésold

Contractors: Wilson Bayly Holmes-Ovcon (WBHO)