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Rainwater harvesting tirupur - Version 1
- 1. Water Rainwater harvesting Rebuilding anurban water culture Shubha Ramachandran Biome Environmental Trust
- 3. The liberator –the hole in the ground which yielded precious water
- 4. Did the Buddhadrink from this well ? Sarnath 500 BCE
- 5. Vijayanagar Kingdom – 500years ago
- 6. Bangalore – living history(100 years
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- 10. Photo : NormaAngelica Hernandez Berna Ultimate source of all water : RAIN
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- 14. Rainwater harvesting components: 1) Catchment 2) Conveyance 3)Filtration 4) Storage 5) Recharge <<< The saree is the Catchment, conveyance The collection and storage of rain for future productive use
- 15. Rainfall pattern inTirupur MONTH QUANTITY (mm) JAN 14 FEB 6 MAR 13 APR 57 MAY 82 JUN 20 JUL 27 AUG 43 SEP 62 OCT 163 NOV 115 DEC 40 TOTAL 642
- 16. How much watercan I harvest
- 17. How much waterdo I use ? Use Litres/person Drinking 3 Cooking 4 Bathing 20 Flushing 40 Washing-clothes 25 Washing Utensils 20 Gardening 23 Total 135 Real Consumption range : from 50 to 300 liters per person per day National Town planning Norms : Urban : 135 Lpcd Rural : 55 Lpcd
- 18. RWH Potential (forevery 100sqm of surface) Nature of Surface Runoff Coefficient Runoff for average 30mm rain (in KL) Annual runoff for 642mm (in KL) Rooftop 0.8 2.4 51 Paved Area / Roads 0.5 1.5 32 Unpaved Areas / Garden 0.1 0.3 6
- 19. Case: Industry: RWHPotential 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
- 20. ….So how cleanis Rainwater ?.... Rainwater in a Glass - Guess Which is which ? A Bucket of Rainwater
- 21. A clean roofmeans clean water
- 23. Downpipes Down water pipesmade of - HDPE - PVC - Chains
- 24. Join all thepipes……
- 25. Gutters Gutter-for sloping rooftransmitted through - PVC - Polycarbonate - GI - Aluminium - Stainless steel PVC GUTTER
- 27. Clean Rainwater :FRS& Filtration
- 28. First rain separation– let the rain clean the roof
- 29. Details of arain barrel Aluminium basket filter Plastic basket filter
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- 34. Rain barrel :easiest way to begin rainwater harvesting
- 35. Rainwater harvesting inan industry Rain Barrels harvesting rooftop rainwater
- 36. Bring it toa Storage
- 37. Storing in theUnderground Tank
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- 41. Ground Water Recharge ●Recharge Well ● Deep Borewell Recharge ● Recharge Trenches
- 42. Groundwater recharge :Wells & Borewells
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- 44. The pit hasreach the silt layer Pit and concrete rings Placing of the rings Recharge Well :The making of a recharge well
- 45. Recharge wells details Siltand leaves trap in a stormwater drain Covers : grilled or perforated RCC
- 46. Rainwater sent for recharge Recharginga bore well Outlet pipe in recharge well
- 47. Schema Front Section- Recharge
- 51. Procedure • Locate rechargewell 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
- 52. Don’t forget themaintenance
- 54. Borewells ! How doesit look inside ?
- 55. Recharging directly intoborewells Need to be very very careful About water quality
- 57. Planning for RWH Natureof 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
- 58. Sizing the RWHStructures 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
- 59. 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
- 60. Costs S No ItemRate 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
- 61. Maintenance ● Keep theterrace/campus clean ● Clean Storm water drains ● Dont let water stagnate anyplace ● Clean out the filters 2 times during the year ● Clean the storage tank
- 62. Best Practices ● Meteringthe borewell ● Water Balance – Metering Demand and Supply ● Setup Rain Gauge ● Metering the harvested rainwater
- 64. Monitoring ● Water Quality ●Water Availability ● Depth to Water (below ground level) ● If the water is actually going into the borehole (rate of recharge) !!.
- 65. Biome Environmental SolutionsPvt Ltd (Rainwater Club) rainwaterclub@gmail.com www.rainwaterclub.org 1022, 1st floor, 6th Block, HMT Layout, Vidyaranyapura, Bangalore – 560 097, Phone : 080 41672790
- 66. Multi sourcing :Increasing urban reality (Case of Bangalore) Piped Water : Cauvery River • Unreliable/erratic ? • Scarcity • Infrastructure growth • Too cheap • 100km from B’lore • 500m below B’lore Ground Water : Bore/Open well • Drying up • Bad quality Ground Water : Tanker Water • Availability ? • Quality ? • Cost ? Bottled Water •Groundwater ? •Why ? • Is it really necessary or worth it ?
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