# Catchment runoff estimate
# Scope: Rational-method peak runoff for supplied catchment coefficient and uniform rain intensity.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

area = 1000 m^2
rain = 50 mm/h
coefficient = 0.7

flow := area*rain*coefficient [L/s]

check drain flow budget: flow <= 15 L/s

scenario alternative: area = 800 m^2