RainSava® Residential
Rainwater Harvesting and Rainwater Collection System by Bord na Móna
Purified water is required for drinking, cooking, dishwashing and hygiene, but these uses account for less than half the water usage of a typical household. Rainwater can be used for toilet flushing, washing machine, watering your garden and washing you car.
Calculate Your Rainwater Harvesting Potential
If you're interested in Rainwater Harvesting at your home, here's how to estimate annual water supply:
- Collection Area (sq. ft) x Rainfall (in/yr.) / 12 (in/ft) = Cubic Feet of Water/Year
- Cubic Feet/Year x 7.43 (Gallons/Cubic Foot) = Gallons/Year
- For example, a 500 sq. ft roof that gets 36 in/yr. will produce 1,500 Cubic Feet or 11,145 Gallons of water per year.
PLEASE NOTE: this calculation is for horizontal areas and does not take into consideration system losses such as evaporation or leakage.
Important Principles of Rainwater Harvesting and Storage:
- Any Rainwater entering the tank should be as clean as possible; this is accomplished using our Rainwater Harvesting Filters. The Rainwater Harvesting Filters are only removed for cleaning purposes, when no water is flowing through the unit.
- Rainwater that enters the tank must be ‘calmed’ — rather than openly discharge into the Rainwater Collection Tank, Rainwater should be directed to the bottom where it can gently percolate upwards, below the minimum water level. It is important that this bottom sediment is not disturbed as in time it will form a beneficial biological layer that assists in maintaining Rainwater quality.
- The Rainwater Collection Tank should be designed to overflow periodically, at least twice per year, in order that any floating debris can be removed by the skimming effect of a suitable overflow device. For this reason the volume of the Rainwater Collection tank should be carefully calculated to ensure that overflow conditions occur. These first two principles are taken care of by the ‘smoothing inlet’ and the ‘multi-siphon’ overflow trap fitted to the Rainwater Collection Tanks as supplied by Bord na Móna.
- Rainwater should be extracted from the cleanest part of the tank; just below the surface, as achieved by the use of a fixed or floating suction filter. This ensures that the Rainwater extracted avoids both floating debris and bottom sediments.
Cleaning the leaf filter is the only routine maintenance necessary for the operation of the Rainwater Harvesting System, although a visual check of the tank and its components should be carried out on an annual basis. The RainSava Rainwater Harvesting System is made up of a number of separate components. Some of these are to be located in the underground Rainwater Collection Tank, while the flow controller, the mains water assembly and the level gauge (if used) are to be fitted in a convenient location within the home.
Why Choose Bord na Móna Environmental?
- Over 20 year's industry experience in environmental products
- Supplier of reliable, sustainable Rainwater Harvestings Systems.
- Never compromise on quality.
- A range of options: Rainwater Harvesting, Rainwater Collection, Wastewater Treatment and Wastewater Recycling Systems for a broad range of applications (residential and commercial systems available).
- Customer focused and responsive: assistance from pre-planning to delivery.
- International experience: Ireland, UK & USA.
Rainwater Harvesting Design & Guidance Manual (.DOC)
