Conclusions and recommendations
The protection of water resources from deterioration in quality by point and non-point source pollution discharges is probably the biggest challenge in sustainable water resources management and it has been growing. Technology selection for urban drainage systems plays an important role in the efficient management of runoff and wastewater. It is a complex decision involving different criteria, including environmental, social, technical, economic and institutional. The investments to improve the water quality for their different uses have focused largely on ‘end of pipe’ approaches via the construction of wastewater treatment plant. To take advantage of the benefits of the proposed strategy in the current research, the basin must be used as a unit of analysis. Minimization and prevention can be achieved through combinations of the introduction of low consumption devices, use of grey water, and rainwater harvesting. The best alternatives were selected applying the analytical hierarchy process and grey relational analysis, considering multiple criteria including technical, social, environmental and economic.