Given $U{H}_1$ and $U{H}_2$ for two subareas of a watershed that meet at confluence point $A$; use the $10-$yr $6-$hr design rainfall for Houston $($Fig$.$below$)$ to find the resulting storm hydrograph at the point of confluence. Use hydrograph convolution $($add and lag$).$ Assume infiltration losses are $0\mathrm{.}15in.$ for the first hour and $0\mathrm{.}1in\frac{.}{h}r$ thereafter. Estimate the area of subarea $1.$ Figure $E$ below shows the watershed

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