Estimate peak roof runoff from connected area, rainfall intensity and a runoff factor.
Use horizontal roof projection draining to the selected outlet.
Use a local design intensity for the selected duration and risk.
Fraction of rainfall assumed to reach the drainage system.
Estimated peak runoff
3.00L/s
Uniform rainfall over the connected roof and a constant runoff factor. Roof geometry, gutter storage, wind, blockage, snow, outlet hydraulics and local sizing rules are excluded.