Roode Els Berg Dam


Roode Elsberg Dam is located on the Sanddrift River, some 10 km north west of the town of De
Doorns in the Western Cape. The catchment is medium-sized and the dam functions
primarily as storage for domestic and irrigation use. The dam completed in 1969, was designed,
built and is owned by the Department of Water Affairs and operated by the Hex Valley Water
Users Association.
The dam wall is a double curvature arch dam with an uncontrolled ogee spillway in the river
section. An apron is provided at the toe of the spillway. A gallery system of two interconnected
galleries in the dam body itself as well as five galleries into the foundation provide drainage and pressure relief to the dam.
The main outlet works of the dam consists of an inlet structure on the left bank upstream of the
dam wall. The inlet is controlled by a service gate. From the inlet a 1 890 mm diameter tunnel
leads to a control room 91.44 m downstream of the inlet. The control room is accessed by a
tunnel from the left bank downstream of the dam wall. In the control room the water flows
through a 1 219 mm steel pipe.
General
Owner: Department of Water Affairs
Designer: Department of Water Affairs
Type: Double curvature arch dam
Built by: Department of Water Affairs
Region: Western Cape
Nearest Town: De Doorns
Completion date: 1969
Purpose: Irrigation and domestic use
Size: Large
Classification: Category 3
Capacity 7.73 x 10'6 m3
Concrete arch
Spillway type: Uncontrolled ogee
Non-overspill crest level: RL 577.492 m
Full supply level: RL 572.92 m
Freeboard between NOC and FSL: 7.572 m
Height above riverbed: 65.53 m
Effective crest length of spillway: 74.371 m
Capacity of spillway: 1 659 m3/s
Roode Els Berg Dam is dam in South Africa.