Make roof water useful

RainwaterTo — rainwater tank and reuse planner

Calculate roof yield, size a tank, simulate monthly balance, garden demand, gutters, filtration, overflow and savings. Data stays in your browser.

From roof to decision

First calculate inflow, then seasonal demand and the performance of a specific capacity. Finally check overflow, hydraulics and cost.

Calculate annual roof yield, demand coverage, overflow and shortfall with a monthly storage balance.

See monthly inflow, use, tank level, overflow and shortfall for a selected rainfall profile.

Compare many capacities and find the smallest tank that reaches the selected demand coverage.

Calculate water yield from horizontal roof projection, rainfall, roof material and system efficiency.

Estimate monthly plant demand from area, reference evapotranspiration, plant factor, rainfall and irrigation efficiency.

Check how much water from a single storm fits in the tank and how much reaches overflow or infiltration.