A catchment has $25\%$ Type B soil and $75\%$ Type C soil. The land cover is $50\%$ good condition half wooded and half residential. Assuming a normal moisture conditions, determine the direct runoff from a storm of $140mm$ from this catchment. Assume the growing season. Use SCS$-$CN Method

$\backslash$table$[[$Land Use,Soil Group,$\%,$CN$],[$Wooded$,$B$,13\%,55],[-$ditto$-,$C$,38\%,70],[$Residential Area,B$,13\%,75],[-$ditto$-,$C$,38\%,83]]$

Potential Retention, S$,$ in $mm$

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Excess Rainfall or Direct Runoff, $Pe$ in $mm$

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Weighted CN

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