Dirty Water Storage Calculator Calculate how many m³ and gallons of dirty yard water you need to store each year Total Dirty Yard Area Area in square metres (m²) Or in square feet (ft²) Annual Rainfall in Your Area Rainfall in millimetres (mm) Or in inches Run-off Coefficient (optional) Typical concrete yards: 80–90% of rain runs off. Adjust if needed. 85% = 0.85 (recommended default) Annual Dirty Water Volume 0 cubic metres (m³) = 0 litres 0 UK gallons = 0 imperial gallons You need storage for approximately 0 m³ (This is total annual volume — most farms size tanks for 4–6 weeks of peak winter flow) Download Your Dirty Water Storage Report Download PDF Report Free • No Spam • Professional report
