Rainwater harvesting cost by plot size in Gurgaon

Cost for each plot size

Roof taken as about two-thirds of the plot, which is typical for a builder floor or kothi; your drawing gives the exact figure. Priced with a 120 ft bore, filter chamber, pit, media and piping. Use the recharge pit calculator for your own roof.

When it is compulsory

Under the Haryana Building Code, 2017, roof rainwater harvesting is required inside the plot wherever the rooftop area is 100 sq m or more. Recharge is mandatory for all building types, including group housing on plots over 500 sq m, and for common open areas such as parks and parking. DTCP has made RWH pits a condition for the occupation certificate. So most plots of about 180 sq yd and more need it for the occupation certificate, and so does any building whose roof reaches 100 m².

Smaller plots are not caught by the rule, but a recharge point next to your borewell is still the cheapest way to slow its decline. Read the full rainwater harvesting rules in Gurugram.

Builder floors and shared roofs

On a builder floor the roof belongs to the top floor or is shared, but the rainwater harvesting requirement belongs to the building. The builder usually puts one recharge point in the front setback, connected to all the downpipes, and the cost is shared across the floors.

If you are buying a floor, ask to see the pit, its filter chamber and the bore. A pit that exists only on the drawing can hold up the occupation certificate for the whole building.

How the water travels, from roof to aquifer

Rain on your roof runs to the downpipe. The first-flush diverter throws away the dirtiest first rain, the filter chamber cleans the rest, and the clean water goes into the recharge pit and down the bore to the water-bearing layer. Any extra overflows to the drain.

The standard design we build

Every recharge point we build follows this design. Roof water passes a first-flush diverter that throws away the dirtiest first rain, then a filter chamber, and enters a brick-lined pit filled with boulders, gravel and coarse sand. At the bottom of the pit it goes into a slotted pipe wrapped in mesh, rising to a removable cap at the cover, down a sealed casing to the water-bearing layer your borewell draws from. The drawing below shows the pit and the pipe connection.

The drawing and the bill of quantities below are what you receive before work starts, sized for your roof after the survey. Check them against any other quote line by line.

Sample bill of quantities for one recharge point in Gurugram

Civil work at the CPWD Delhi Schedule of Rates 2023 plus 10%, the rest at market rates, with a 120 ft bore. A bigger roof needs more pits, but one filter and pipe set can serve several. Price your own roof with the recharge pit calculator.

Frequently asked questions