Rainwater Harvesting

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Rainwater Harvesting Related Systems

• By Rob Parsons

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Sustainability and Water

• We must manage ever increasing demand for potable
  water. Finite resource.
• Various impacts on environment.
• Stormwater management
• Need to reduce stormwater runoff.
• SuDS.
• Flooding.
• CSOs.
• Potable water uses energy. Transmission and
  treatment. Large network transfers (Water Grid)
  rare mostly already in place.

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Water Consumption Make Up
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Regulatory Position

• Little promotion of water saving of energy saving
  organisations/advice industry.
• Very few grants to speak of. (ARENA)
• Govt has introduced ECA for some RWH components.
• No over arching regulator They pull in opposite
  directions OFWAT-EAW-DEFRA-DTI-WCC.
• So what is so great about rainwater?

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So what is so great about rainwater?

• At present it is free
• Can be used to get ISO 14001
• Many planning departments insist on environmental
  benefits being included on new buildings.
• In some processes better than domestic water.

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What can Rainwater be used for?

• Flushing WCs, urinals.
• Washing laundry.
• Washing down and garden irrigation.
• All above uses in schools, public buildings,
  offices, stadia, shops, etc, etc..
• Industrial low grade water uses.
• Why use high quality water for dirty
  processes?

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Rainwater Commercial System
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Rainwater Tanks

• Load bearing designs.
• Tanks from concrete, PE or GRP.
• Sizes from 1000 to 250 000l.
• Overflow essential.
• Unobtrusive, low cost.

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Top Up and Controls

• Automated mains water top up.
• Air gap required.
• Can use UV to achieve potability.

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Oil Separators

• To take water from drive ways or car parks.

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Grey Water Re-Cycling

• Requires a licence from the DOE
• Filters out grey water sinks, washers, etc
• Have multi layer filtration
• Auto cleaning systems for maintenance.

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Farm Example

• Farm has lake and bore hole. Also large under
  ground concrete storage bunker.

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Industrial Site

• 21 Units and Farm buildings. Water for cleaning,
  washing and toilets.

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Shopping Centre

• Water for new toilet blocks.

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Conclusion

• Many benefits both environmental, and financial
• Very little governmental support at present.
• Rain Water - Dont Lose it Use it.