Problem: A rainfall lasting $1hr$ produced a runoff hydrograph from a $10m{i}^2$ drainage basin as shown in the line labeled "Measured Q$"$ in the following table of computations. The discharge in cubic feet per second was measured at the beginning of each of twelve $4hr$ time periods. At the beginning of the storm the base flow for the basin was $20cfs.$ Determine the unit hydrograph of the basin for $1hr$ storms.

$\backslash$table$[[$Period$,1,2,3,4,5,6,7,8,9,10,11,12],[$Hours$,0-4,4-8,8-12,12-16,16-20,20-24,24-28,28-32,32-36,36-40,40-44,44-48$