The wind speed is $50$ m$/$s and blows at $30$

o NNW$,$ the open distance across the

reservoir is $23$ km and is oriented at $80$o NNW$,$ and the depth of the reservoir is $20$m$.$

Find: $($a$)$ Freeboard required above maximum water surface elevation from inflow and

outflow of reservoir,

$($b$)$ method for obtaining each given parameter value in real life.