Environmental Water Management Calculators
Greywater reuse, irrigation demand, infiltration trenches, soakaways and bioswales — the tools for getting water back into the ground instead of the drain.
Environmental Live Tool
Greywater Reuse Calculator
Reusable greywater available per day and the storage volume needed, from residents, laundry flow and the captured fraction.
Q_reuse = (n x q_person + q_laundry) x capture fraction Environmental Live Tool
Irrigation Demand Calculator
Daily and weekly irrigation water requirement from reference evapotranspiration, crop factor and system efficiency.
V = A x (ET0 x Kc) / (1000 x efficiency) Environmental Live Tool
Infiltration Trench Calculator
Length and drain time of an infiltration trench from the stored runoff volume, void ratio and soil infiltration rate.
V = A x P x C ; V_trench = V / void ratio ; t = V / (k x base area) Environmental Live Tool
Soakaway Calculator
Soakaway storage and base area from a percolation test result, the drainage area and the design storm.
k = 1000 / percolation time ; V = A x P x C ; A_base = V / depth Environmental Live Tool
Bioswale Calculator
Trapezoidal bioswale geometry, storage volume, media void storage and drawdown time for a given infiltration rate.
A = (b + z d) d ; V = A L ; t = V / (k P L)