Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Texas; Urban Rainwater Harvesting for Landscape Irrigation - Austin Energy

1,150 views

Published on

Texas; Urban Rainwater Harvesting for Landscape Irrigation - Austin Energy

Published in: Design, Technology, Business
  • Be the first to comment

Texas; Urban Rainwater Harvesting for Landscape Irrigation - Austin Energy

  1. 1. Urban Rainwater Harvesting for Landscape Irrigation Dick Peterson Environmental Program Coordinator Austin Energy Green Building www.austinenergy.com/go/greenbuilding
  2. 2. Rainwater Through The AgesRainwater harvesting practiced for over 4,000years in desert of southern IsraelAncient Roman had cisterns and aqueductsEarly 1900’s farms and ranches had cisternsCurrent resurgence of rainwater collection LadyBird Johnson Wildflower Center Currently 72,000 gallon capacity have plans for another 25,000 gallonsMany Caribbeannations mandaterainwater harvesting
  3. 3. Why Collect Rainwater?Rainwater pH is almost neutralPlants love itRainwater does not have dissolvedminerals from the soilOr chemicals from water treatmentplantsHarvesting reduces erosionReduces water bill – you do not use asmuch expensive potable water on yourlandscape
  4. 4. In Texas, rainwater harvestingsystems are sales tax exemptTax Code Section 151.355(1) provides an exemption forthe recycling system if purchased on or after September1, 2001.Sec. 151.355. WATER-RELATED EXEMPTIONS.The following are exempted from taxes imposed by thischapter:(1) rainwater harvesting equipment or supplies, waterrecycling and reuse equipment or supplies, or otherequipment, services, or supplies used to reduce oreliminate water use….
  5. 5. ComponentsFirst Flush “Poor Man’s RoofWasher” PVC pipe with fittings running to the ground with a screw on cap at the bottom for clean out First 8-10 gallons collects debris from roof and gutters -- diverted by first flush before tank inlet
  6. 6. ComponentsFirst Flush “Poor Man’s RoofWasher” PVC pipe with fittings running to the ground with a screw on cap at the bottom for clean out First 8-10 gallons collects debris from roof and gutters -- diverted by first flush before tank inlet
  7. 7. ComponentsFirst Flush “Poor Man’s RoofWasher” PVC pipe with fittings running to the ground with a screw on cap at the bottom for clean out First 8-10 gallons collects debris from roof and gutters -- diverted by first flush before tank inlet
  8. 8. First Flush Filter & Inlet Piping
  9. 9. ComponentsPVC Drain-Waste-Vent Fittings
  10. 10. Recycled drums can be easilyconverted into rainbarrels
  11. 11. Sunshine Community GardensRainbarrel Clinic
  12. 12. Salvaged drums can be left as isor painted to better blend with the landscape
  13. 13. Horizontal, vertical and with anornamental, decorative rain chain
  14. 14. Recycled drums come in variousshapes, sizes and materials
  15. 15. City of AustinWater Conservation Program www.cityofaustin.org/waterco n
  16. 16. Tanks are available in many sizesand configurations
  17. 17. Simple System Options
  18. 18. Simple System Diagram
  19. 19. How about a pond tank?
  20. 20. Drinking Water Systems
  21. 21. Drinking water systems requiremore equipment and maintenance
  22. 22. Drinking water systems require more equipment and maintenanceFrom “Rainwater-Collection Systems”by Peter PfeifferFine Homebuilding Magazine
  23. 23. Drinking water systems requiremore equipment and maintenance
  24. 24. Good source of tanks are “feed and ranch” stores 305 300 550 5,0002,500 3,000
  25. 25. To reduce algae, tanks should beblack, green, covered, or painted
  26. 26. Tall configuration 500 gallontank
  27. 27. Low configuration of a 500gallon tank
  28. 28. Sometimes a “rain barn” is builtto provide more roof area 2,500 Gallon Tank
  29. 29. Tank inlet must be lowest pointin the collection piping 2,500 gallon system on a high school portable classroom
  30. 30. Zilker Botanical GardenMaster Gardener Greenhouse
  31. 31. American Botanical Councilhas 2-850 gallon collection tanks 8 years old Liner System helps avoid rust
  32. 32. American Botanical Council10,000 gallon fiberglass storage tank
  33. 33. American Botanical Council10,000 gallon fiberglass storage tank
  34. 34. American Botanical Council
  35. 35. American Botanical Council Coriolis Effect
  36. 36. Location and access may dictatesize of tanks Two 1100 gallon tanks cost more than one 2500, but allow access to garage
  37. 37. A 10’ x 10’ garden shed cancollect 60 gallons in just a 1” rain 750 gallon fiberglass tank
  38. 38. Austin’s first “modern” harvester Hugh M. “Bud” Kane
  39. 39. H. E. B. Grocery Store in Austin
  40. 40. 46,000 gallon Ferro-cement tankSunset Canyon Pottery Studio
  41. 41. 77,000 gallon Ferro-cement tank
  42. 42. Typical Underground Cistern
  43. 43. 37,500 gallon Ferro-cement tankFrom “Rainwater-Collection Systems”by Peter PfeifferFine Homebuilding Magazine
  44. 44. WoodenTanks
  45. 45. 500 gallon “TimberTank”
  46. 46. How much will rainwater harvesting cost?It really does vary... Do you already have gutters? If not, what type will you install? Type and size of tank Will you use a pump? Pad construction This is NOT how to do it!
  47. 47. ComponentsRoof Type Any roof will do Metal is the ideal roof - smooth and non-absorbent Composite, wood shingles, asphalt…all absorb water and will break down over timeGutters 30 cents per foot for plastic up to $15 per foot for copperScreens Screens are not necessary unless your house has a lot of tree cover
  48. 48. ComponentsRoof Washer From “Rainwater-Collection Systems” by Peter Pfeiffer Fine Homebuilding Magazine
  49. 49. ComponentsRoof Washer $300-600 container with 30 micron filter water must pass through filter before filling tank If not cleaned regularly breeding ground for bacteria will keep water from entering tank not necessary for non-potable systems
  50. 50. ComponentsBarrels Purchased or recycled barrel Should be painted to keep out sunlight and prevent algae growth
  51. 51. ComponentsPolypropylene Tanks $.35 to $1.00 per gallon Most common Easy to install Should be black, green or painted
  52. 52. ComponentsConcrete or Ferro-cement tanks $.35 to $1.00 per gallon Durable Can be buried
  53. 53. ComponentsMetal Tanks 40-60 cents per gallon Short life span – rust, except with special liners
  54. 54. ComponentsWooden Tanks $2.00+ per gallon Ideal for remote locations, pack in the pieces Can be dissembled and moved Available up to 2,000,000 gallons!
  55. 55. ComponentsStone Tanks Very expensive Difficult to maintain
  56. 56. ComponentsPumps $200-600 install pump as close to tank as possible protect from freezing in-tank float switch in general 3/4 quarter horsepower is sufficient It will allow you to pump water 400 feet
  57. 57. MaintenanceWith a first flush system you willwant to clean out the PVC afterevery rainfallIf you have screens, clean themafter a rain when there has notbeen any rainfall for a period oftimeMost people who have installedtheir systems over the past 5 years,have not had to clean the tank ofdebris
  58. 58. Bt-Biological Mosquito Control
  59. 59. Whisky is for drinkin… Water is for fightin’ over! Mark Twain Water is a precious resource… Use it wisely… Harvest rainwater!Austin History Center, St. Edward’s cadet straddling Lake Austin
  60. 60. Urban Rainwater Harvesting for Landscape Irrigation Dick Peterson Environmental Program Coordinator Austin Energy Green Building www.austinenergy.com/go/greenbuilding

×