Rout the given inflow hydrograph using the Muskingham method with $k=2\mathrm{.}3hr$ and $x=0\mathrm{.}3.$ Assume that the outflow at the first time step is $75$ cms $.$ Then, plot the inflow and the obtained outflow hydrographs in a single graph. You can show a sample calculation step and then carry out the rest of the computations in Excel. $(25$ pts$)$

$\backslash$table$[[$Time $($hr$),$Inflow $($cms$)],[1,90],[2,143],[3,211],[4,315],[5,442],[6,555],[7,640],[8,680],[9,699],[10,675],[11,625],[12,570],[13,460],[14,390],[15,329],[16,239],[17,179],[18,131],[19,101],[20,89]]$