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[[File:RAINWATER HARVESTING TANK 550x550.jpg|thumb|Large cistern being installed underground]]
[[File:RAINWATER HARVESTING TANK 550x550.jpg|thumb|Large cistern being installed underground]]
[[File:RWH Tree.PNG|thumb|Conceptual image of an underground cistern being used for irrigation of nearby vegetation on site.]]
[[File:RWH Tree.PNG|thumb|Conceptual image of an underground cistern being used for irrigation of nearby vegetation on site.]]
Adequately sizing rainwater harvesting systems is critical to optimizing their operation because under-sizing results in systems that are unable to provide a sufficient, reliable source of water while oversizing increase the capital costs incurred with limited marginal benefits and poses potential water quality risks. In a recent research literature review, Semaan et al. (2020) identified sizing for water storage as most important for system optimization, yet found that sizing for cost is a more frequently implemented optimization approach. They note several sizing and optimization approaches and tools are available globally. <ref>Semaan, M., Day, S.D., Garvin, M., Ramakrishnan, N., Pearce, A. 2020. Optimal sizing of rainwater harvesting systems for domestic water usages: A systematic literature review. Resources, Conservation & Recycling: X 6 (2020) 100033. https://www.sciencedirect.com/science/article/pii/S2590289X20300049?via%3Dihub </ref>
Follow the link below for detailed guidance on approaches to sizing rainwater harvesting systems in Ontario.
[[Rainwater Harvesting: Sizing and Modelling]]
[[Rainwater Harvesting: Sizing and Modelling]]
===Catchments===
===Catchments===