Rainwater Harvesting Basics
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1 Rainwater Harvesting Basics Designing and Installing Systems for Home and Landscape Chris Maxwell-Gaines, P.E.
2 Integrated water conservation solutions Rainwater, Graywater, Drainage, Irrigation Design / Build Residential / Commercial
3 So what s the big deal about rainwater harvesting? Aren t we in a drought? It s NOT going to rain ever again, don t you know?
4 Typical Urban Water Balance Model Precipitation AC Condensate Municipal/Well Water Other Stormwater Typical House and Property Run-off Wastewater (Black / Gray)
5 Integrated Urban Water Balance Model Precipitation Rainwater/AC Harvesting Municipal/Well Water Graywater Reuse Other Stormwater Low Impact Development Strategies Wastewater (Black)
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9 Future Conservation Gains will be Outdoors Indoor Water Conservation Standards
10 Law of Diminishing Returns
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12 Rainwater Math 1 inch of rain on a 1,000 sq ft collection area will yield 623 gallons in of rain X roof sq ft X gal/sq ft
13 Rainwater collection benefits Reduces storm water runoff Better for your lawn and garden plants Simple technology that is easy to maintain Recognizable as a green building technique Solution to on-site drainage problem Reduces effective impervious cover
14 The Uses of Rainwater Outdoor water use Irrigation of landscaping and lawns Other outdoor uses Indoor, non-potable water use Toilets, urinals, & clothes washing machines Potable water supply Filtration and disinfection required
15 System Sizing & Efficiency Most frequently asked question tough to answer Water budgets are good start Collection surface size Two basic constraints: Physical space & Budget
16 The Importance of Storage Volume
17 The Importance of Storage Volume
18 Always Have a Back-up Strategy Water budgets look good until the first drought
19 Rainwater system typology Dry Connection: Pipes drain completely Easy system to install and maintain Tank must be located close to collection surface Wet Connection Water remains in collection pipes Gutter must be above tank inlet Allows any location of storage tank
20 Imagine a P-Trap
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23 Rainwater system components: Roof Type Metal Asphalt Shingles Clay/Concrete Slate
24 Rainwater system components: Gutter or Inlet Screening Your first line of defense
25 Rainwater system components: Tank inlet filter and screen
26 Inlet filtration is vital
27 Inlet filtration is NOT first flush Inlet filters keep large debris out First flush from the roof carries a higher concentration of pollutants. It should be diverted from collection, not just filtered. Inlet filtration + First flush = Best Practice
28 Rainwater system components: First Flush Diverter Diverts the initial wash of the roof
29 Adequate first flush amount? TWDB suggests >10 gallons / 1,000 sf Depends on who you ask and what research you read Ultimately depends on use of rainwater, roof type, and location issues
30 Rainwater system components: Backup Water Supply Auto-fill mechanism Manual fill Auto-switch Remember, Air gap or RPZ
31 Rainwater system components: Water Level Gauge
32 Rainwater system components: Irrigation Pump System Pump sized for demand Different type of systems: Hose bibb only Connected to irrigation On-demand Don t have to settle for onsite water pressure
33 Rainwater system components: Potable Pump/Filtration/Disinfection System Cartridge filters Disinfection methods: UV Ozone Chlorine
34 Rainwater Incentives COA provides a rebate up to $5,000 for systems over 300 gallons Rainwater harvesting equipment is sales tax exempt in TX Hays County gives property tax exemption COA provides water quality credits LCRA provides impervious cover credits
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36 Recent bad install sighting in Austin
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39 System Design Overkill
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42 Aboveground tank buried??
43 Where will the rainwater hit?
44 Flying pipes?
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46 First-Flush Mixing with the Good
47 Bad inlet connections
48 Exposed PVC to the sun
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51 Underground Filter Aboveground
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