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Rainwater harvesting
- 1. .ppt (1) SUBMITTED TO : Dr. Sarvesh Kumar
- 2. .ppt (2) 1. WHAT IS RAINWATER HARVESTING? 2. WHY RAINWATER HARVESTING? 3. HOW TO HARVEST RAINWATER? 4. DESIGN CONSIDERATIONS 5. STORAGE 6. RWH-METHODOLOGIES 7. OPERATIONAL PROCEDURES
- 3. .ppt (3) RWH technology consists of simple systems to collect, convey, and store rainwater. Rainwater capture is accomplished primarily from roof- top, surface runoff, and other surfaces. RWH either captures stored rainwater for direct use (irrigation, production, washing, drinking water, etc.) or is recharged into the local ground water and is call artificial recharge. In many cases, RWH systems are used in conjunction with Aquifer Storage and Recovery (ASR). ASR is the introduction of RWH collected rainwater to the groundwater / aquifer through various structures in excess of what would naturally infiltrate then recovered for use.
- 4. .ppt (4) Why Rainwater Harvesting? >Conserve and supplement existing water resources >Available for capture and storage in most global locations >Potentially provide improved quality of water >Supply water at one of the lowest costs possible for a supplemental supply source. >Capturing and directing storm water (run-off) and beneficially use it >Commitment as a corporate citizen - showcasing environmental concerns >Public Mandate (India) >Replenishing local ground water aquifers where lowering of water tables has occured
- 5. .ppt (5)
- 6. .ppt (6) Rain Water as Source Water Design Considerations 1 Roof 2 Screen 3 Discharge of water 4 Pre-filter 5 Storage tank 6 Flow meter 7 Storm water discharge
- 7. .ppt (7) Storage • Storage devices may be either above or below ground • Different types include Storage Tanks Water Containers Lagoons or Lined Ponds Infiltration Ponds • Size based on rainfall pattern, demand, budget and area
- 8. .ppt (8) •Roof Rain Water Harvesting • Land based Rain Water Harvesting • Watershed based Rain Water harvesting • For Urban & Industrial Environment • Roof & Land based RWH • Public, Private, Office & Industrial buildings • Pavements, Lawns, Gardens & other open spaces
- 9. .ppt (9) Operational Procedures & Design Considerations
- 10. .ppt (9) Operational Procedures & Design Considerations
Editor's Notes
- The collection device usually represents the biggest capital investment of an RWH system. It therefore requires careful design- to provide optimal storage capacity while keeping the cost as low as possible. While above-ground structures like tanks are easily purchased or made with a variety of designs, and water extraction is in many cases by gravity; they also are expensive, require more space and are prone to attack from the weather. Below-ground structures like cisterns, lagoons etc. are generally cheaper due to lower material requirements and unobtrusive. However, water extraction often requires a pump, contamination is more common, and present a potential danger to children and small animals if left uncovered.