A power plant structure having maximum dimension $120m$ is proposed to be built on down hill side near Trivandrum $($kerala$).$ The height of the hill is $330m$ with a slope of $1$ in $3.$ If the location is $280m$ from the crest of the hill on downward slope and its eve board is at a height of $15m,$ determine the design wind pressure. Assume $S=1$ & Basic wind speed in Trivandrum $=39\frac{m}{s}.$