Ntimbale Dam

Type: Clay Core Rock Fill with Roller Compacted Concrete (RCC) Spillway
Construction Date: 2005 - 2006
Location: North East District, Botswana
S 20.868571° E 27.450584°
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)

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