i will answer in a general ...

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i will answer in a general for all cit ies since water is alw ays going to be in short supply.

1. rainwater  harvesting to collect all rainwater & storing into the ground for reuse as grey water in toilets other than the one household drinking water tap in the kitchen.

2. using storm  water by installing a sump filter every 2 kms along the slope of the storm water pipes so the water after simple filteration by gravel & sand seeps into the ground through a 5 inch diameter & 5 foot long pipe inserted into the ground to raise groundwater levels in the area.