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Storm water harvestin_Anamrita khan_2013


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A case study of storm water harvesting, its need, benefits, ongoing schemes and solutions

Published in: Education, Technology
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Storm water harvestin_Anamrita khan_2013

  1. 1. Storm Water Harvesting
  2. 2. Flow • The Philosophy – Why? • Vision • Methodology • Solutions
  3. 3. What is Stormwater Harvesting • Stormwater harvesting involves collecting, storing and treating stormwater from urban areas, which can then be used as recycled water. • The stormwater is collected from stormwater drains or creeks, rather than roofs. Recycled water is treated so it’s safe to use. Recycled water produced from stormwater harvesting is commonly used to water public parks, gardens, sports fields and golf courses.
  4. 4. “Character of a nation is determined by its Quality of Water”. - Humberto Urriola
  5. 5. PROBLEM Fundamental Design Problem Upstream Vs Downstream
  6. 6. Benefits of stormwater harvesting • Reduces the demand for drinking water by replacing it with recycled water produced from stormwater harvesting. • Reduces stress on urban streams and rivers by capturing some of the pollutants and nutrients that would otherwise enter waterways from stormwater flows. • Enables users to access an alternative source of water for non-drinking use. • Increases opportunities for sustainable water management, which is an important consideration in water sensitive urban design.
  7. 7. Stormwater Harvesting Schemes Stormwater harvesting schemes can be large or small. A stormwater harvesting scheme consists of: • an extraction point where stormwater is captured or diverted from a drain, creek or pond • a network of pipes to transport stormwater from the connection point to the storage site • a dam or storage tank where stormwater is temporarily collected for treatment and use • a treatment system that produces recycled water that is suitable and safe for its permitted use • a network of pipes for distributing recycled water • a system to manage by-products produced in the stormwater harvesting facility.
  8. 8. Steps to follow
  9. 9. Preliminary investigations and advice Doing some research for your stormwater harvesting scheme is the first step. Details we need to consider for your proposal include: • • • • • how the recycled water will be used the volume of recycled water required for the proposed end use required extraction volumes the proposed stormwater treatment system the space required for your stormwater harvesting treatment facility • likely costs and savings
  10. 10. Develop and review your concept plan and design Develop a concept plan and design that details the proposed: • location of the extraction point • stormwater extraction volume • collection and treatment processes • any discharge points.
  11. 11. Decide whether to proceed If we decide to go ahead with stormwater harvesting scheme, we will need to select a technology supplier and may need to engage a Water Servicing Coordinator (WSC).
  12. 12. Innovative Water Management Solutions • Gravity based solutions • No external energy or chemicals involved • Based on molecular design of water • Capillary action • Aeration of water • Emulating natural systems • External filter saving natural resources • Similar products for various applications • Minimize maintenance time and cost •Qualify for Green Ratings / LEED points
  13. 13. Fundamental Design Problem 100% PERVIOUS SURFACE 100% IMPERVIOUS SURFACE Vs The Traditional Solution Stormwater Pollution Destroys Natural Ecosystems Pollutes Water Bodies Increases Global Warming Creates Urban Flooding Increases Drought Burden The Sustainable Solution Point source Solution No Environmental Hazards Clean Water Storage No Urban Flooding Reduces Global Warming Cost Effective
  14. 14. Innovative & Sustainable Solutions planning | design | implementation | Payoff Water Management Modular Rainwater Modular Storm Water Harvesting Pond / Development Pond / Lake Remediation Modular Waste Water Treatment Landscaping Vertical Gardens Roof Gardens Aqua Scaping Soft Landscaping Hard Landscaping Vertical Drainage Consultancy Watershed Management Water Audits Urban Flood Mitigation Ecological Channels Vertical Drainage
  15. 15. Steps Involved • Planning  Feasibility study  System specifications  Engineering drawings  Site audit – Sources for water harvesting – Irrigation system evaluation (if needed) – Uses for harvested water  LEED evaluation  Budget estimate  Return on investment analysis – Water savings – Energy savings
  16. 16. Steps Involved (Contd.) • Installation/Site Management  Project planning with target dates  Site coordination  On-site installation supervision and project management  Testing and commissioning  User system/product training  Coordination of integration with building automation system • Service Full system warranty
  17. 17. Modular Rainwater & Stormwater Harvesting Benefits •Eco friendly, qualifies for getting carbon credits •Qualifies for LEED points / Green Ratings •Surface above the tank can be used for any type of landscaping •Easy to expand and relocate according to new site plans •Low maintenance costs •Long shelf life of 50 years •Quick installation •Clog free, safe & highly load bearing
  18. 18. MATERIALS USED in a Modular Tank Geo-textile Waterproof Liner (for Storage and reuse only)
  19. 19. Dual Step EXTERNAL FILTRATION for easy and inexpensive maintenance, Clog-free performance Step – 1 De-silting Chamber/Oil Filter Step – 2 Patented Micro-Filter • Designed for any flow situations • Pre-manufactured, short time of installation • Designed for easy and low cost maintenance Easy Maintenance • Removes particles up to 180microns in size • Suitable for flow situations of 72 cum/hr • Pre-manufactured, short time of installation • Extremely easy to maintain – at little or no cost
  20. 20. Flexible Applications of Modular Technology i. Ground water recharge using recharge wells ii. Storage + Reuse iii. Storage + Percolation iv. Pond Recharge
  21. 21. Successful Installations 158 CUM 102 CUM 200 CUM 20 CUM 73 CUM
  22. 22. Final Sites can be under • Driveways • Parking • Parks • Sport fields • Ponds
  23. 23. Successful Installations Capacity: 6,00,000 Liters Application: Breweries - Below parking lot Catchment: Surface & Storm water
  24. 24. Capacity: 1,200,000 Litres Application: Automobile Manufacturing Facility - Below lawn Catchment: Surface & Rooftop
  25. 25. Innovative Approach
  26. 26. Solution Pond Development Advantages • Contributes to zero discharge • Can be used as recharge, store and reuse • Quick to install Laying of geo textile Compaction • Restores water bodies • Adds to the aesthetics Installation of EPDM liner
  27. 27. Case Study Pond Development Pond – Budi Bawal
  28. 28. Solution • Increases road lifetime • Water reuse / harvesting • Increases land use • Reduces urban flood • Saves lives eliminating dangerous open water channels • Restores microhabitats • High load bearing capacity • Can create bio-swales / rain gardens • Reduces erosion by in-filtering water at the source Ecological Channels
  29. 29. Steps Involved
  30. 30. Case Study 70m long drain with recharge rate of 1200 litre / hr
  31. 31. Solution Bio swales / Rain garden • Best for large parking lots and their connecting road drain network • Controls flood • The added green space provides habitat for some wildlife species, especially birds • Reduces sediment load and other water pollutants from reaching natural watercourses
  32. 32. Solutions Bioremediation Advantages • It is a natural process • Cost effective After • Lesser energy required • Less supervision • Treats area that are not easily accessible or inaccessible to other technologies • Air pollution concerns from volatile chemical evaporation are eliminated
  33. 33. After On-site Purification Before Nala Rehabilitation
  34. 34. Water Logging, 100% Runoff PROBLEM Cause Poor Urban Planning Consequences 100% Runoff through Concrete Water Stagnation leads to Mosquito Breeding Water Logging
  35. 35. Solution Sub Surface Drainage Benefits •Captures rain water for reuse •Prevents flooding •Increases property value •Increases usable space •Driving vehicles onto the grass has no effect on the protected roots •Access roads, footpath, parking bays, driveways
  36. 36. Case Study Sub Surface Drainage The developers wanted to provide overflow visitors parking that was aesthetically pleasing for residents. The 52 mm turf cell was installed with a subsurface layer of 30 mm drainage cell and turfed for immediate use.
  37. 37. Thank You