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Thornlea

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Thornlea on Google Earth
Thornlea on Google Earth

Particulars

Owner: Umlaas Irrigation Board

Designer: Bradford, Conning and Partners

Contractor: Cyclone Construction

Statistics

Type: Gravity

Purpose(s): Irrigation

Reservoir capacity: 3 m3x106

Height: 17 metres

Length: 135 metres

Volume of RCC: 16 m3x103

Total volume: 17 m3x103

Construction Dates

Start of Project: 06/90 (June 1990)

Start of RCC: 10/90 (October 1990)

End of RCC: 12/90 (December 1990)

End of Project: 02/91 (February 1991)

Country: South Africa

River: Mlazi

DMS Co-ordinates: 29˚48'6.61"S, 30˚28'38.47"E

DD Co-ordinates: -29.801836, 30.477352

Facings

Upstream

SlopeType
VerticalTraditional concrete against formwork

Downstream

SlopeType
0.90RCC against formwork  [stepped face]

Spillway

SlopeType
0.90Traditional concrete against formwork

Placement

Layers (mm)Lifts (mm)
170170

Cementitious material

Cement (kg/m3)
38
Pozzolan (kg/m3)Pozzolan Type
87Ground-granulated blast-furnace slag