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Rainwater harvesting · Gurugram · industry

Rainwater harvesting for factories in Gurgaon, Manesar and Udyog Vihar

A factory or warehouse roof in Gurugram is large enough to put millions of litres a year back into the ground, and the state's groundwater permission asks for exactly that. Gurugram pumps out 195% of the groundwater that can safely be taken out each year, with water 20–40 m below ground in most monitoring wells. TerraSetu prepares the recharge design that goes with the permission, builds it and keeps it working.

Reviewed by Mohit Parmar, Civil Engineer, TerraSetu · Last checked

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Groundwater permission in Haryana

  • Under the Haryana Water Resources (Conservation, Regulation and Management) Authority, every industry, infrastructure project and mining project that uses groundwater needs the Authority's permission. Infrastructure includes hospitals, schools, hotels, restaurants, malls, clubs and housing societies.
  • Individual households without a public water supply, rural drinking water schemes, the armed forces and farming are exempt. Micro and small units drawing under 10 m³ a day are exempt from permission but must register with the Authority.
  • Where the water level is deeper than 8 m, which is most of Gurugram, the application needs a rainwater recharge proposal. Where it is shallower, roof water has to be collected in a lined tank and reused instead.
  • The Authority asks for 90 days of groundwater tariff in advance, based on the unit's stated demand, before it issues the permission, and processing takes about a month.
  • These points are from the Haryana Water Resources Authority's published FAQ. Check the conditions printed on your own permission, which you must follow.

What we do for a factory

  1. Survey

    Roof, shed and paved areas, downpipes and storm drains, existing borewells and their yield, and the soil.

  2. Recharge proposal

    A design sized for Gurugram's rainfall: the number and position of recharge wells or pits, the desilting chambers and the bore depth, with drawings and a calculation of the water recharged each year.

  3. Build

    Desilting chambers on the storm drains, filter chambers on the roof lines, recharge pits and bores, all built to the drawing, with photos at every stage.

  4. Records

    An as-built drawing and photo record for the permission file and for inspections.

  5. Maintenance

    Pre-monsoon and post-monsoon cleaning with a short report each time, so the system keeps working and the record stays current.

What it costs

Priced with 120 ft bores and 721 mm of rain a year. Large sheds usually need desilting chambers on the storm drains as well, priced after the survey.

BuildingRoof areaRecharge pointsWater put back a yearCost with GST
Society tower block, school or small factory2,000 m² (21,528 sq ft)812,25,700 litres₹8 lakh to ₹12 lakh
Mid-size society or factory5,000 m² (53,820 sq ft)1830,64,250 litres₹18 lakh to ₹28 lakh
Large campus, society or plant10,000 m² (1,07,639 sq ft)3661,28,500 litres₹36 lakh to ₹55 lakh

Ranges for budgeting, with filter chambers, pits, media, bores and piping.

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.

Flow diagram of a rainwater harvesting system: roof, downpipe, first-flush diverter, filter chamber of gravel, charcoal and sand, recharge pit with an overflow to the drain, and a bore down to the water-bearing layer
The complete flow, from roof to aquifer, not to scale.

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.

Section drawing of a 2 m by 2 m by 2.5 m recharge pit with coarse sand, gravel and boulders. A pipe runs from a removable cap at the cover down through the layers, slotted and wrapped in mesh where it passes the sand, gravel and boulders, is sealed with clay or cement grout below the pit, continues as plain 150 mm casing, and ends in a slotted section in the water-bearing layer. A close-up shows the slots, mesh and cap.
Our standard recharge point, in section, not to scale. The bore depth shown is typical; sizes and depth are fixed for each site after the survey.

Sample bill of quantities for one recharge point on a factory roof

ItemQuantityAmount before GST
Recharge pit 2 × 2 × 2.5 m: excavation, honeycomb brick lining, PCC base, RCC cover with manhole1 no.₹28,000 to ₹38,000
Pit media: boulders, gravel and coarse sand in layers1 pit₹8,000 to ₹12,000
Recharge bore, 150 mm, with slotted PVC casing (₹300 to ₹500 a foot)120 ft₹36,000 to ₹60,000
Filter chamber: gravel, charcoal and sand1 no.₹12,000 to ₹20,000
Downpipe connections, mesh guards, first-flush diverter and overflow1 lot₹8,000 to ₹15,000
Total before GST₹92,000 to ₹1.4 lakh
Total with 18% GST₹1.1 lakh to ₹1.7 lakh

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.

Where we work

IMT Manesar and Manesar, Udyog Vihar, Sector 37 and Khandsa, Daulatabad, Sohna, Bilaspur, Binola, Pataudi and the warehouses along NH-48 and the KMP Expressway. We also work in Faridabad, Noida and Delhi.

Check the numbers for your area

Frequently asked questions

Does a factory in Gurgaon need groundwater permission?

Under the Haryana Water Resources (Conservation, Regulation and Management) Authority, every industry, infrastructure project and mining project that uses groundwater needs the Authority's permission. Infrastructure includes hospitals, schools, hotels, restaurants, malls, clubs and housing societies. Individual households without a public water supply, rural drinking water schemes, the armed forces and farming are exempt. Micro and small units drawing under 10 m³ a day are exempt from permission but must register with the Authority.

Is rainwater harvesting required for the permission?

Where the water level is deeper than 8 m, which is most of Gurugram, the application needs a rainwater recharge proposal. Where it is shallower, roof water has to be collected in a lined tank and reused instead.

How much does rainwater harvesting cost for a factory?

For a 5,000 m² roof, about ₹18 lakh to ₹28 lakh with GST for 18 recharge points with 120 ft bores. Desilting chambers on storm drains are extra and depend on the site.

Can you work while the factory is running?

Yes. Pits and bores go along the boundary, roads and green areas, and we plan the work in sections so loading bays and access stay open.

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