All buildings to be constructed in future, in urban areas, should have provision for roof-top rainwater harvesting commensurate with its plinth area with minimum capacity of 5 KL (kilolitre) for plinth area above 200 m², 2 KL for plinth area of 200 m² or below in case of residential build ings and minimum capacity of 0.01 m³/m² of plinth area in case of commercial and institutional buildings such as tour ist complexes, hotels, shopping complexes, and govern ment buildings, provided that the minimum standards for commercial and institutional buildings shall also apply to such buildings in areas not covered within the limits of urban areas.

Where minimum standards have already been laid down by the state governments, such standards shall take precedence.

The institutional and commercial buildings should not draw water from the existing water supply schemes, which adversely affects water supply to local villages or settlements.

In rural areas rain water harvesting should be undertaken through such structures as percolation tanks and storage tanks and any other means.

Spring sanctuary development should be undertaken in the spring recharge zones to augment spring water discharge.

Rain water collected through storm water drains should be used to clean the waste disposal drains and sewers.

Groundwater aquifer recharge structures should be constructed wherever such structures do not lead to slope instabilities.