This tool estimates the volume of water required for toilet flushing in a building and compares it to the amount of water that a rainwater harvesting system could capture from roofs and parking lots. Inputs include: information on building occupancy, average rainfall, and roof and parking lot catchment areas. Results are estimates of toilet flushing water requirements, volume of rainwater available, percent of toilet flushing need that could be met, and volume of any additional rainwater available for irrigation or other uses.
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