Magalies Water invited two more tenders as part of the Hartbeespoort Dam remediation project.
One of the tenders is for the design and installation of fine and adjustable barriers for the removal of residual floating substances from the dam. According to the tender document, “the project seeks to acquire services of a competent and experienced service provider to assist with the design and installation of flexible barriers for the removal of floating substances in Hartbeespoort Dam. This should be anchored using a robust civil structure with cognizance of worst-case scenarios in terms of flood lines and climate extremities. This line should be used to capture finer and smaller floating materials as a polishing step. Cleanability of the barriers should be considered during the design and every ecological activity should be favoured since impeding ecological systems could affect the holistic functioning of the dam in terms of ecological services.”
According to the project description, Hartbeespoort Dam is infested with floating debris, natural waste and ‘living materials’ as a result of upstream activities in the Crocodile and Magalies Rivers. “There is a need to install barrier lines to capture residual substances from the first filtration system for the benefit of water quality in the dam and its primary and ancillary services.”
The project is to be completed in three months.
The second tender seeks to appoint a service provider to design and install robust steel nets for the removal of floating substances in the Crocodile and Magalies Rivers. The width of these two rivers is 150m and 200m. The nets should be submerged at least one metre into the water and should be flexible to adjust to high and low flows. “This should be anchored using a robust civil structure with cognizance of the worst-case scenario in terms of flood line and climate extremities. This line should be used to capture coarse and big floating materials,” according to the tender document. The project is to be completed in two months.
Compulsory briefings took place at the Hartbeespoort offices of the Department of Water and Sanitation on Monday.