Discuss in detail roof top rainwater harvesting.
Harvesting rainwater from roof-tops is an easy and eco-friendly method of augmenting household-level water availability. Roof-top rainwater harvesting (RRH) involves diverting and recharging (or) storing part of the rainwater that falls on the roof of a house. RRH for recharging groundwater is a common practice implemented in individual houses as well as apartment complexes.
In such cases, harvested water is directed into a recharge pit which collects and slowly recharges into the groundwater storage / aquifer in that area. But, storing the rainwater and directly using it is also a feasible option for those who want to directly benefit from augmented water availability.
1. Roof area calculation
Roofs are of broadly two categories - flat roofs and sloping roofs.
Flat roofs when made with reinforced cement concrete normally have waterproofing course on the surface as a finish. The waterproof course is done with a small slope towards the downtake pipes. Usual practice is to use lime surkhi, in recent
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