//Width of gate(in m):
w=5;
//Depth of water(in m):
D=4;
//Density of water(in kg/m^3);
d=999;
//Accelration deto gravity(in m/sec^2):
g=9.81;
//Value of a (in m):
a=4;
//Point where force acts(in m):
l=5;