In this regard the International Water Management Institute (IWMI) suggests that a mix of storage options, including aquifer recharge, restoring natural wetlands, enhancing soil moisture and small ponds and tanks would complement reservoir storage to increase water availability. Rainwater harvesting is one of the cheapest and easiest ways of augmenting water stock.

Despite an existing regulation which makes rainwater harvesting mandatory for all new buildings with a roof area of more than 100 square meters, few do it.

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