Residence of Prithvi and Purushotham

ROOF: The roof area is approximately 650 square feet. The roof was given a slope to bring all the rainwater to one point. The rainwater is brought down through one 90 mm diameter down-pipe to a first rain separator.

When the terrace is being cleaned, the cap of the first rain separator can be opened and the dirty water allowed to flow in to the front garden. After cleaning the cap is closed and the first rain separator collects the first 1.50 mm of rain falling on the terrace every time it rains. The maximum amount of silt and dust on the roof is picked up in this vertical pipe first rain separator leaving cleaner rainwater to be filtered and stored for use.

FILTER: Then the rainwater is filtered using a 90 litre blue colored HDPE drum. Rainwater enters from below the drum and passes through two layers of sponge kept at intervals. The water is then picked up at the top and led into the sump tank of capacity 6000 litres.

During heavy rains if the sump tank fills up, the overflow of rainwater is led into an open well on site. The house is a ‘zero runoff’ house in so far as rainwater is concerned. All rainwater falling on the plot or the roof is either collected or allowed to recharge into the open well. In fact the side setback area is left unpaved to allow for infiltration of rainwater too.

Prithvi Purushotam Rainwater Available : 82,080 litres
Rainwater harvested : 65,664 litres
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