This dam was built in the catchment of the Sabie River, which serves as a storage facility for a pipeline transfer scheme in Busbuckridge. The dam supplies bulk raw water for domestic use to the rural and semi-urban population consisting of more than a million people. The dam also has an environmental impact on the catchment of the Sabie river due to the fact that access runoff is released in a controlled manner to ensure supply in the natural riverine environment and in the adjoining Nature reserves.
The dam consists out of earth filled flank walls on either side of the central trough spillway. The overall length of the structure is 550m whilst the total spillway length measures up to 138m. The spillway crest level is 35m above the lowest draw down level (RL 733,71m). The total volume of earth fill used was 1,4mil m³ against the 330 000m³ concrete used to construct the spillway and tower. See annexure C for detail sketches about wall and outlet works
The design flood level for the dam is 36.6m higher than the lowest draw down level, at 770.30m above mean sea level. The reservoir capacity at full supply level (FSL) is 123mil m³. Design spillway discharge at high flood level is 1300m³/s and during design flood level of 770.3m the discharge should be 610m³/s. A temporary area capacity table was derived from the surveys conveyed and the plans of the dam wall and it was detected to be faulty due to the fact that some alterations were made during the construction of the spillway which was not indicated on the plans. Therefore it is considered to be temporary, until as build surveys are completed to confirm alterations made during construction.
The outlet structure consist out of two 1m diameter sleeve valves plus an additional two 400mm diameter sleeve valves, to release water into the Marite river, which will be monitored at the down stream component X3H011. See annexure A1 for the temporary area capacity table.