Rainwater Harvesting Greywater Irrigation
LEED CERTIFICATION Water Harvesting is very important due to:   Conservation of Water   Lowering Depletion of Natural R...
Components of Rain Harvesting CATCHMENT AREA/ROOF GUTTERS & DOWNSPOUTS LEAF SCREENS & ROOFWASHERS – to remove debris  &...
Water Savings Potential (RainwaterHarvesting) Dependent on: (1) catchment area , (2) storage  capacity, (3) annual rainfa...
Irrigation Options Gravity Feed or Pump; Manual or Automatic Manual Irrigation – preferred for small systems: hose  bib ...
IMPORTANT CONSIDERATIONS Metal roofs > best catchment; if painted, must be with  non-toxic paint (paints w/ no lead, chro...
IMPORTANT CONSIDERATIONS Roof, gutters, downspouts > clear of leaves, branches,  debris. Note > overhanging branches = bi...
GREYWATER untreated used household water that does not contain  human wastes – washing/rinse water, water from  bathtub, ...
GREYWATER SYSTEMCOMPONENTS Dual-plumbing > collect water from desired sources Three-way valve to divert contaminated wat...
GREYWATER SYSTEMS: TREATMENT Aerobic Pre-treatment > to filter off large debris, good  for bathtub, shower, washing machi...
 Two types:    Water-injection system that prevents soil erosion    Gravity or pressure leaching chamber    http://www...
GREYWATER SYSTEMS COSTING Low-tech: 200 micron mesh (filter) + 55 gallon tank w/  locking lid = $400-800 (P17-35K) Mediu...
NOTES/TIPS/MAINTENANCE Highly beneficial for landscape irrigation Determine which plants will be irrigated with    greyw...
RECOMMENDATIONS WRT MADE Ideal for landscape irrigation, toilet flush Rainwater harvesting preferred over greywater reus...
Efficient water consumption
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Efficient water consumption

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Efficient water consumption

  1. 1. Rainwater Harvesting Greywater Irrigation
  2. 2. LEED CERTIFICATION Water Harvesting is very important due to:  Conservation of Water  Lowering Depletion of Natural Resources & Materials  Creating a Sustainable Site  Use of Innovative Design LEED points > http://www.whollyh2o.org/daily- stream/item/430-leed-certification-and-water- harvesting.html
  3. 3. Components of Rain Harvesting CATCHMENT AREA/ROOF GUTTERS & DOWNSPOUTS LEAF SCREENS & ROOFWASHERS – to remove debris & contaminants (ex. Plantboxes) CISTERNS or STORAGE TANKS CONVENYANCE – delivery system (gravity or pump)* *more on the gravity pump (BBC winner) TREATMENT – filters, additives, (recall schmutzdeck)
  4. 4. Water Savings Potential (RainwaterHarvesting) Dependent on: (1) catchment area , (2) storage capacity, (3) annual rainfall, (3a) seasonality of rainfall 1500 sq-ft (139.35 sqm) roof = 934 gallons (~3,500 L) from 1” rainfall > 20” annually = 18,680 gallons (13,248 L) > storage tanks must have corresponding capacityhttp://www.world-climates.com/city-climate-metro-manila-philippines-asia/
  5. 5. Irrigation Options Gravity Feed or Pump; Manual or Automatic Manual Irrigation – preferred for small systems: hose bib >> bottom of rain barrel; much less expensive & easier to maintain Drip Irrigation – in dryer regions: storage tank >> gravity fed drip system; must be filtered to avoid clogging of drip channels Automatic Irrigation – complex system of pumps, irrigation emitters/sprays, for LARGE RWH systems
  6. 6. IMPORTANT CONSIDERATIONS Metal roofs > best catchment; if painted, must be with non-toxic paint (paints w/ no lead, chromium or zinc) Overhanging vegetation must be avoided > may clog roof gutters/etc Tanks: tight-fitted and with screens to avoid mosquito nesting, prevent debris/critters from entering tank; screens must be regularly cleaned; OPAQUE to prevent algal growth Gravity is preferred over pump
  7. 7. IMPORTANT CONSIDERATIONS Roof, gutters, downspouts > clear of leaves, branches, debris. Note > overhanging branches = bird perching = droppings. Cleaning at frequent intervals Irrigation system must be checked for leaks, blocked emitters Rainwater may be used not only for toilet & irrigation, but with sufficient filtering, may actually be used for washing.
  8. 8. GREYWATER untreated used household water that does not contain human wastes – washing/rinse water, water from bathtub, sink, shower Up to 40 gallons per person per day (average) Used mainly for toilet flushing, irrigation of non-food landscape (ornamental plants only; meaning it may not be used for organic garden) Dual plumbing = expensive; more effective if they are incorporated into the construction of a new home but probably not for modifying an existing home.
  9. 9. GREYWATER SYSTEMCOMPONENTS Dual-plumbing > collect water from desired sources Three-way valve to divert contaminated water or excess water to sewer or septic system Treatment system > *more in next slide Holding tank Pump or Gravity-Fed distribution system
  10. 10. GREYWATER SYSTEMS: TREATMENT Aerobic Pre-treatment > to filter off large debris, good for bathtub, shower, washing machine > not for kitchen sink. Commercial version: Clivus greywater management fabric filter configuration, Willa eco- matic Anaerobic treatment prior to aerobic pre-treatment >> needed for sources with food waste/organic particles Planter soilbox design >> in use in 1975 w/ excellent results
  11. 11.  Two types:  Water-injection system that prevents soil erosion  Gravity or pressure leaching chamber  http://www.greywater.com/treatment.htm > more details
  12. 12. GREYWATER SYSTEMS COSTING Low-tech: 200 micron mesh (filter) + 55 gallon tank w/ locking lid = $400-800 (P17-35K) Medium-tech: 200 micron mesh + 2 x 55-gal tanks + sump pump + subsurface drip irrigation = $1,000-1,500 (P43-65K) Fully-automated installation: pumps, 3-way valve, backflow control, etc, up to 250 gal capacity = $2,500 – 5,000 (P100-200K)
  13. 13. NOTES/TIPS/MAINTENANCE Highly beneficial for landscape irrigation Determine which plants will be irrigated with greywater. Simpler installations are usually more successful & offers better ROI Secure tanks from mosquitoes, algal growth, debris Efficient Irrigation design must consider sufficient percolation but NOT excessive flow to avoid erosion Stored greywater MUST NOT LEAVE your property > septic tank; meaning not good for flood-prone areas.
  14. 14. RECOMMENDATIONS WRT MADE Ideal for landscape irrigation, toilet flush Rainwater harvesting preferred over greywater reuse Data is available on storage/output volume estimates, monthly rainfall in mm so we can compute Gravity pump may be used in conjunction with the system With reservoir + gravity pump = water flowing through interior regularly = aesthetics + passive cooling Further research = ferro-cement (used in tanks?)

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