$($a$)$ Develop and plot the individual storm hydrographs for subbasins $1,2,$ and $3.$

$($b$)$ Develop and plot a combined storm hydrograph at point A in the watershed and route the hydrograph to point B using the Muskingum method. Assume that the travel time from point A to point B is $30$ min and the weighting factor is $0\mathrm{.}15.$ Use $\backslash (\backslash$Delta t$=10\backslash$mathrm$\{$~min$\}\backslash ).$

$($c$)$ Develop and plot a final storm hydrograph at the outlet of the watershed at point B by combining the routed hydrograph from part $($b$)$ with the storm hydrograph for subbasin $3.$

$($d$)$ What is the peak flow at point B and when does it occur?