South Durban sewer project completed despite unrest, political pressure and groundwater gremlins
11 September 2019 | Web Article Number: ME201916157
BOSCH Projects recently completed a R32-million bulk sewer infrastructure project south of Durban for the eThekwini Water and Sanitation Division.
The company was appointed to carry out multi-disciplinary designs, implementation and construction management for the Malukazi Bulk Sewer Infrastructure Scheme, a sub-project of the Provision of Water and Sanitation Services to Human Settlements – Sanitation Phase 3.
The scheme included the construction of bulk sewer gravity mains, a sewer pumpstation, sewer rising main and 20№ communal ablution facilities, with associated water and sewer reticulation, connecting into the adjacent Lower Malukazi Phase 1 catchment.
“Apart from the civil design and electrical and mechanical components, Bosch Projects was also responsible for the important co-ordination management of sub-specialists, including mechanical, ventilation, fire, geotechnical, electrical, roads and earthing contractors,” said project manager, Manditha Jamuna, Bosch Projects.
“This project, which commenced in August 2016, created employment within the community and now provides a basic level of service of sanitation and water to the previously unserviced community. Despite numerous challenges affecting the continuity of work, including business forums, community unrest and political pressure in the area, the project was completed within budget and to the highest quality standards,” Jamuna said.
Civil design for this project encompassed the pumpstation design review, the design of a temporary pumpstation, bulk and reticulation sewer infrastructure, roads and stormwater rehabilitation and the environmental management of water course. Electrical and mechanical components included pump and associated pipework design, ventilation design, lighting and electrical supply, lightning protection and telemetry.
Another challenge of this project included construction of the pumpstation in excessive ground water conditions. The base of the concrete superstructure of the pumpstation was partially completed in a previous phase of the sanitation project. Water ingress needed to be controlled and managed by continuous pumping out of the 18m deep excavation during construction. Geotechnical intervention was required to ensure stability of the excavated area.
The complexity of the project was increased as a temporary pumpstation - designed to service communal ablution facilities in the interim - was operational during construction of the main pumpstation. The temporary pumpstation was then converted into the overflow chamber of the pumpstation.
Bosch Projects, a member of the Bosch Holdings group of multi-disciplinary consulting engineering companies, offers solutions throughout southern Africa, in diverse sectors, including energy and industrial plants, water and wastewater, roads, land and building developments, as well as sugar and agriculture, ports and terminals.
These services include project and construction management; programme management – management of multiple linked projects; procurement and contract services; risk management; quality assurance and projects control, including cost and schedule management.