Integrating water‐saving schemes in the design of sanitary sewers
2020
Basupi, Innocent
Urbanisation and climate change worsen the ever‐increasing gap between demand and the supply of water. Closing the gap between water demand and supply remains a global challenge that influences the growing uptake of water‐saving schemes (WSSs) to reduce the threat to water security. This study proposes a method for simultaneous design of sanitary sewers (SSs) and the selection of WSSs. An integrated design approach (or problem) that matches SSs with WSSs was formulated and solved as a multi‐objective optimisation problem. The two objectives considered are: (1) minimisation of the total cost and (2) maximisation of the cost benefits of interventions. The main constraints considered include the sanitary sewer technical and hydraulic performances. The problem was solved using the well‐known NSGA2 optimisation technique. The proposed method was demonstrated using a subsystem of the Tsholofelo Extension sanitary sewer in Gaborone. The results obtained from the integrated approach suggest that WSSs influence designs of the sanitary sewer (SS) and the other way round.
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