Ceres Koekedouw Dam

Type: Rock-Fill Asphalt Core Dam
Construction Date: 1954, Rebuilt 1998
Location: Near Ceres, Western Cape, South Africa
S 33.363411° E 19.273666°
Ceres Dam, situated in the mountains above Ceres in the Ceres Valley, South Africa is a 60m high Rock-Fill asphalt Core Dam with a 387m crest length. This is the first dam on the African continent built using this technique -asphalt. During the massive earthquake in 1969 the old concrete dam was severely damaged and had to be replaced. Replacing/rebuilding a new structure made it possible to increase the reservoir from the existing 0.4 million m³ to 17million m³.

The asphalt core is 50cm wide and has filter zones on both the up-stream and the Down Stream side. Each filter core measures 1.5m. 4500m³ of prepared asphalt was used to complete the dam.

Ceres Koekedouw Dam Instrumentation consists of the following:
  • Vibrating Wire foundation Piezometers measuring pore pressure.
  • Two Vertical Inclinometer casings with Spider Magnets for measuring Settlement.
  • Vibrating Wire Transducer measuring seepage.

Instruments installed in and around the Dam Embankment are intended to monitor:
  • Tilt of the Dam;
  • Measuring the pore pressure;
  • Measuring the settlement;
  • Seepage weirs;
  • Lake Level Recorder.

Installed Instruments Specification:
Seepage (Dam)
Geokon Vibrating Wire Transducers Vented Model 4580
Piezometers (Foundation, Lake Level)
Geokon Vibrating Wire Model 4500S
Geokon Vibrating Wire Pressure Transducers Model 4500H
Geokon Vibrating Wire Pressure Transducers Model 4500HH
Inclinometer (Main Embankment)
Geokon Inclinometer Casing Model 6500
Geokon Inclinometer Probe Model 6000
Data Acquisition System CR1000 (Valve House)
Geokon Micro-1000 Data logger Model 8021
Geokon Multiplexer (MUX) Model 8032

Designers: N/A

Consulting Engineers: Bester Consultants

Contractors: Grinaker LTA

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