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How much rain must be drained?
Beregn den dimensionerende regnvandsstrøm fra et opland efter DS 432:2020: q = A·φ·i, hvor A er arealet, φ afløbskoefficienten og i regnintensiteten. Standardregnintensiteten (konservativ ≈0,015 l/(s·m²) = 150 l/(s·ha), 2-årsregn før klimafaktor) er vejledende — den bindende dimensioneringsregn = den lokale kommunale regnrække × klimafaktor (≈1,3).
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