Water & Environment
Hazelmere Dam Raising
On 17 October 2011 the Department of Water Affairs (DWA) appointed Ingérop South Africa (ISA) as Consulting Engineers for the Raising of Hazelmere Dam by 7 m. Hazelmere Dam is a Category 3 concrete gravity dam structure and in accordance with the Dam Safety Legislation regulations, is subject to the most stringent engineering standards as the failure of such a structure has potentially disastrous implications in terms of direct damage to life and property as well as impact on the security of a critical water supply.
Extensions of the existing (30 Ml/day) potable water treatment works at Olifantspoort to 60 Ml/day for the augmentation of supply of water to the existing Olifants-Sand transfer scheme to the Greater Polokwane area. The extension works consist of additional pumping and extraction capacity from the Olifants River, 800 mm diameter steel (concrete lined) raw water rising main, sedimentation tanks, gravity filters, additional clear water storage and all associated auxiliary works (interconnecting pipe works and telemetryinstallation) and extensions of the high lift pump station (300 m static and 400 m dynamic head, 1 MW motors).
Cahora Bassa Spillway Gates - Mozambique
The Cahora Bassa Dam system is the largest hydroelectric scheme in southern Africa with the powerhouse containing 5 x 415MW turbines. The eight spillways of the dam have continuously been operated every year since the construction of the dam in 1976. Indeed, because of very low hydro electric power generation due to the outage of transmission lines during the war, no water flow was discharged through the turbines and all Zambezi river flow have been discharged through these spillways. Under these operating conditions and limited maintenance, general repairs and refurbishment are now necessary that require high level of technical knowledge.
Lomati Dam Upgrading Works
ISA have been involved from the application of funding from the MWIG to the preliminary and final design and finally up to construction supervision stage of the repair and refurbishment works to Lomati Dam. Investigation into the repair and refurbishment works began as far back as 2008, with construction commencing in November 2013. Once the dam safety requirements of Lomati Dam have been met, Ingérop South Africa will commence work investigating the raising of the dam wall in order to increase the dam yield. This will involve the possible use of fuse-gates at the existing spillway
NWSEPIP : Detailed Design and Works Supervision for Strengthening Water Transmission Pipelines
Undertake a yield analysis of the Ruiru Dam to assess opportunity for obtaining more water resources, and prepare a conceptual design for increasing water supply to Nairobi as appropriate. Package 3A: Restoring the transmission mains between Ngethu and Gigiri with the addition of 13km of 900mm steel pipeline Package 3B: A complementary 700mm transfer line 9,5km long, and additional pumping equipment to ensure a supplementary flow of 42,000 m3/day transferred from Gigiri to Kabete.
Replacement of Existing Water Main in the Table Mountain National Park : Cape Point
Cape Point in the Table Mountain National Park is supplied water through a 110mm main, some 14 kms long. Due its age and material type the main is susceptible to frequent breakages and must now be replaced The main issue of concern is the preservation of the reserves natural environment during construction work. The proposed main will be a 125mm uPVC pipe laid on the same route as the existing pipe. Environmental constraints will provide challenging construction methods. Will be going out to tender towards the end of the year.
Nkangala Thembisile Hani Landfill Site
Thembisile Hani Local Municipality proposes to develop a regional landfill site with a GLB-/B class classification to serve waste producers in the Thembisile Hani Local Municipality. The proposed facility will receive 42 tons per day of general waste.
Safety Evaluation of Faure and Plattekloof Storage Reservoirs and Steenbras Lower, Steenbras Upper and Land en Zeezicht Dams
Work undertaken includes a full site inspection at each of the Reservoirs and Dams; compilation of a comprehensive report on the physical condition of the Dams; reporting on the instrumentation monitoring and compile the relevant dam safety reports and submit to the Dam Safety office at the Department of Water Affairs.
Bitou Refuse Transfer Station
The Bitou Municipality has been operating a Solid Waste Landfill at Robberg for some 20 years. The site was upgraded and licensed in 1998 and it was estimated to have a lifespan of some 15 years, however due to poor management the site has not been properly utilised. PetroSA has recently opened up its landfill to the local municipalities and contracts have been signed for the disposal of waste. The Municipality has thus taken the decision not to continue operating the existing landfill and instead to transfer containerised waste to PetroSA. A number of candidate sites were identified and investigated for a transfer station and materials recovery facility. A Scoping exercise was undertaken and included public meetings and workshops during which the preferred site was agreed. In addition the project includes identifying and developing a number of community drop-off facilities, builders rubble disposal site, a compost facility and closure of the existing landfill. Construction of the station will commence towards the end of 2014.
Monitoring Committees for Landfill Sites and Refuse Transfer Stations
To provide the function of independent chairperson for monitoring committees for 6 large waste management facilities in Cape Town for the next 3 years. The project is primarily administrative including, facilitating committee meeting, minute taking and record keeping.