Water Resources & Hydrology Calculators
Hydrologic estimation tools for rational method peak runoff, basin water balance, and reservoir storage retention.
Water Live Tool
Water Tank Storage Calculator
Size cylindrical and rectangular water storage tanks from dimensions or daily demand and residence time.
V = π/4 × D² × H · V = L × W × H Water Live Tool
Water Demand & Flow Requirement Calculator
Estimate community or facility water demand (domestic, commercial, fire) and the design flow requirement for supply and storage sizing.
Q_design = P · q · peakFactor · Q_avg = V_daily / 86400 Water Live Tool
Tank Fill Time & Filling Rate Calculator
Calculate the time to fill a storage tank from a known filling rate, or the filling rate required to meet a target time.
t = V / Q · Q = V / t