Description Save money! Every location and job has a different amount of harvestable rainwater. Make sure you have enough rainwater storage but not TOO much for your specific needs. Get your rainwater tank sizing perfectly calculated by our OWN system designers. We use 55 years of daily rainfall data from one of 397 stations around Canada, to create a hydrology model of your rainwater system. How much Usable Rainwater will your roof, rainfall, tank size and water demand provide? This forms the basis for determining Return on Investment.
