Example $2$

The table below shows a $4-$hour storm hydrograph resulting from a total rainfall of $27$ mm over a catchment area of $750k{m}^2.$ Baseflow is constant at $5m\frac{3}{s}.$ Calculate:

a$.$ the volume of runoff

b$.$ the effective rainfall

c$.$ Infiltration index $(m\frac{m}{h})$

d$.$ Runoff coefficient

e$.$ Use the Rational formula to predict the max runoff for $10$ mm rain in $4$ hours for a $14k{m}^2$ sub$-$catchment.

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