Rainwater Tank Sizing turns collection and demand estimates into a daily storage model, so you can compare usable supply, practical tank sizes, and performance across historical weather years.
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Favor a smaller tank that makes the most efficient use of storage.
Choose a tank that strikes a balanced compromise between tank size and water savings.
Prioritize greater water savings while avoiding additional storage that adds relatively little benefit.
Choose a tank large enough to achieve nearly all of the meaningful water savings available from storage.
Choose storage aimed at avoiding backup water through the range of historical conditions analyzed.
Choose storage to reduce how much water overflows or is discharged from the system.
Compare recommended storage with smaller, larger, and space-constrained options.
See tank-supplied water, remaining backup needs, and overflow.
Compare performance across historical weather years rather than relying on one average.
Explore optional reserved storage alongside the other selected project uses.
See why this storage size is the best balance between water supplied and additional capacity.
Follow filling and emptying through historical water years.
Compare water supplied by the tank to backup water and overflow.
Compare representative tank and cistern dimensions as a starting point for site-specific planning.
