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RWH Training in Delhi

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RWH Training in Delhi

  1. 1. Rainwater Harvesting Biome Environmental Solutions Pvt Ltd Also:
  2. 2. PARADOX ?
  3. 3. Water Era in India • Rainwater + shallow aquifer < 1850 • Surface water + shallow aquifer+ rainwater 1850 - 1970 • Deep aquifer + surface water + rainwater 1970 --2015 • Rainwater + ….+… 2015 >
  4. 4. The liberator – the hole in the ground which yielded precious water
  5. 5. A hoary past – Well at Lothal 2600 BCE Photo Mrinalinee Vanarase
  6. 6. Did the Buddha drink from this well ? Sarnath 500 BCE
  7. 7. Local hydrologic cycle – seeking bio mimicry with rainwater harvesting
  8. 8. Rainfall pattern in Delhi NCR (varies between NOIDA and GURGAON 30 years data MONTH DAYS QUANTITY (mm) JAN 1.2 14.9 FEB 1 13.1 MAR 0.8 8.9 APR 0.5 6.7 MAY 0.8 22 JUN 2.1 44 JUL 7.4 188 AUG 7.9 191 SEP 4.0 94 OCT 0.8 18 NOV 0.1 5 DEC 0.4 5.5 TOTAL 27 611
  9. 9. RWH Potential (for every 100sqm of surface) Nature of Surface Runoff Coefficient Runoff for average 30mm rain (in KL) Annual runoff for 611mm (in KL) Rooftop 0.8 2.4 48 Paved Area / Roads 0.5 1.5 30 Unpaved Areas / Garden 0.1 0.3 6
  10. 10. Case: RWH Potential as a % of Annual Demand ● Daily Demand = 15 KL (500 people x 30 lpcd) ● Annual Demand = 5475 KL (15 x 365) ● Total Campus = 3000sqm (~ 30,000sqft) ● Rooftops = 1500 sqm (50% of total area) ● RWH potential from rooftop = 733 KL (1500* 0.8 * 0.611 ) ● Other Paved + Unpaved Areas = 1500 sqm ● RWH potential from non rooftops = 275 KL (1500×0.3×0.611) ● RWH Potential as a % of Annual Demand = 18% (733+275)/5475
  11. 11. Rainwater harvesting components: 1) Catchment 2) Conveyance 3) Filtration 4) Storage 5) Recharge <<< The saree is the Catchment, conveyance And filter !!!!!! The collection and storage of rain for future productive use
  12. 12. EVERY ROOF CAN BE A CATCHMENT
  13. 13. Gutters Gutter-for sloping roof transmitted through - PVC - Polycarbonate - GI - Aluminium - Stainless steel PVC GUTTER
  14. 14. Downpipes Down water pipes made of - HDPE - PVC - Chains
  15. 15. Filters
  16. 16. Filters
  17. 17. RWH - Storage ● HDPE tank ● Brick Masonry ● RCC tank
  18. 18. Rain barrel : easiest way to begin rainwater harvesting
  19. 19. Rainwater harvesting in an industry Rain Barrels harvesting rooftop rainwater
  20. 20. Details of a rain barrel Aluminium basket filter Plastic basket filter
  21. 21. Storing in the Underground Tank
  22. 22. Ground Water Recharge ● Recharge Well ● Deep Borewell Recharge ● Recharge Trenches
  23. 23. The pit has reach the silt layer Pit and concrete rings Placing of the rings The making of a recharge well
  24. 24. Procedure • Locate recharge well in the channel or off the channel • Make arrangements to remove silt and leaves before water enters recharge well • Monitor the rate of recharge and decide on the number of recharge wells necessary for the catchment
  25. 25. Don’t forget the maintenance
  26. 26. Recharge pit around bore wells
  27. 27. Planning for RWH Nature of Surface RWH Strategy Rooftop Storage or Deep Aquifer Recharge Paved Area / Roads Shallow Recharge – through trenches, Open Wells Unpaved Areas / Garden Shallow Recharge – through trenches, Open Wells
  28. 28. Sizing the RWH Structures For Storage : ● Depending on usage and budget ● Best to use existing storage structures ● New storage structures can be sized for 30mm to 60mm rain For Recharge : ● Calculate runoff for a 25mm-30mm rain and size accordingly
  29. 29. Designing ● Plot Size : 3000sqm ● Rooftop : 1500sqm, ● Non Rooftop : 1500sqm ● Rooftop Storage : 1500 litres filter and 36KL to 72KL storage OR ● Rooftop Deep Aquifer Recharge : ● Non Rooftop 1500sqm – basic filters in drains and 1 recharge well or 5ft diameter and 30ft deep or Recharge Trench of 20KL capacity
  30. 30. Costs S No Item Rate 1 4” PVC pipes – with fittings 80/- to 200/- per foot 2 6” PVC pipes – with fittings 280/- to 380/- per foot 3 Brick masonry storage/filter 10/- to 12/- per liter 4 Filter media 5/- to 7/- per liter 5 Commercially available filters - 500sqm 18,000/- 6 4KL Recharge Well 35,000/- to 40,000/- 6 16KL Recharge Well 85,000/- to 1,00,000/- 7 Deep bore with casing 30,000/- to 40,000/- for a 6” bore of upto 30m, 1000/- per meter 8 RCC storage 13/- to 18/- per liter 9 HDPE Storage (Sintex tanks) 6/- to 8/- per liter 10 Labour + Other misc 15% to 20% of material costs
  31. 31. Cramped Spaces
  32. 32. Local organizations/People that can help with the implementation ● CSE : Center for Science and Environment ● FORCE : Forum for Organised Resource Conservation and Enhancement ● R Balaji Engineering Co: GB Road : 011-66361953 ● Flowell India, Mayur Vihar ● Geocon Groundwater consultants, Kalkaji (charges for feasibility study and design): 011-66262250
  33. 33. Maintenance ● Keep the terrace/campus clean ● Clean Storm water drains ● Dont let water stagnate anyplace ● Clean out the filters 2 times during the year ● Clean the storage tank
  34. 34. Best Practices ● Metering the borewell ● Water Balance – Metering Demand and Supply ● Setup Rain Gauge ● Metering the harvested rainwater
  35. 35. Monitoring ● Water Quality ● Water Availability ● Depth to Water (below ground level) ● If the water is actually going into the borehole (rate of recharge) !!.
  36. 36. Existing Success Stories in the neighbourhood ● Hero Moto Corp, Gurgaon ● Surya Vihar, Gurgaon ● Tex Corp Limited, Gurgaon ● BPCL Housing Complex, NOIDA
  37. 37. Biome Environmental Solutions Pvt Ltd (Rainwater Club) rainwaterclub@gmail.com www.rainwaterclub.org 1022, 1st floor, 6th Block, HMT Layout, Vidyaranyapura, Bangalore – 560 097, Phone : 080 41672790

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