Flag Boshielo (Arabie dam), situated near Marble Hall, Limpopo, South Africa, is a 36m high Earth Fill Dam (EFD) with Roller Compacted Concrete(RCC) section and spillway with a 1563m crest Length. Structure includes a free crest spillway with a crest length of 176m over RCC.

Flag Boshielo dam has a capacity of 185 million m³.

Flag Boshielo / Arabie Dam Instrumentation consists of the following:

• Vibrating Wire Thermometers measuring temperature.
• Vibrating Wire Foundation Piezometers for measuring pore pressure.
• Vibrating Wire Transducer measuring seepage.
• Standpipe Piezometers measuring seepage.
• Pendulums measuring tilt.

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

• Tilt of the Dam;
• Total downstream seepage;
• Pore pressure build-up in embankment/foundation;
• Lake level water height.

Installed Instruments Specification:

Seepage (Dam)

• Geokon Vibrating Wire Pressure Transducers Model 4500H

Piezometers (Foundation, crump weir, lake level)

• Geokon Vibrating Wire Model 4500S

Temperature Gauge (Main Embankment)

• Geokon Vibrating Wire Temperature Sensor Model 4700

Standpipes (Down Stream to Measure water table)

• Geotechnical Instrumentation Casagrande Standpipes

Pendulums (RCC/Tilt/Roll-Back)

• Geokon Vibrating Wire Pendulum Model 6850A

Data Acquisition System CR800/1000 (Valve House)

• Geokon Micro-1000 Data logger Model 8021

• Geokon Multiplexer (MUX) Model 8032

Designers: Department of Water Affairs

Consulting Engineers: Department of Water Affairs

Contractors: Department of Water Affairs