Description FREE Above Ground – In Basement Non-Potable, 12,000 USG, 2x 6000 USG, 2 Prefilters Water Harvesting Design This rainwater harvesting system is designed as a secondary source of water for In basement non-potable purposes, such as toilets. With a back-up water source from well water if the rainwater tank is empty and city water is there is a power failure. The system will provide water for water uses tier: R2 – non-potable domestic. Roof The system will be harvesting rain from one building with three separate roofs, which are asphalt, with a total roof area of 366 m2. Gutter, Downpipes, and Conveyance Piping The gutters, downpipes, and conveyance piping are sized based on specifications from the designs. Pre-Filter The system will require one (1) pre-filter. These pre-filters operate as both a first flush diverter and prefilter, with a filter mesh size of 320 microns. The full cross-section (pipe diameter) of the rainwater drainage system remains continuously open, and there are no reductions in the cross-section of this appliance in which dirt or water can collect. Rainwater Tank/Cistern This system will provide a total of 33,000 liters of rainwater storage, with a total of two (2) pour-in-place concrete tanks located in the basement. The rainwater tank is designed to provide safe storage of rainwater, which improves water quality because of its design and function. The calming inlet prevents agitation of settled fine dust, the skimming overflow removes floating particles, and the floating filter ensures water is drawn into the pump from approximately 150 mm (6.0″) below the surface of the water. Water Pumping and Treatment System Cleanflo determined the water demand to be 10 GPM @ 60 PSI. This will be pumped by a multi-stage booster pump powered by VFD. The treatment will be three stages to ensure water is safe and no staining on fixtures. Stage one is a sediment filter of 15 microns, which provides a self-cleaning flush to drain. Stage two is a 10 carbon filter. Stage three is a 1 micron sediment filter. Stage four is an ultraviolet sanitation system NSF 55 Class A. Water Quality and Treatment Cleanflo designed this system to produce water that is safe for CSA B805 R2 uses; namely, non-potable domestic.
