A 10-ft-wide rectangular channel carries 500 cfs at a depth of 7 ft. Now, a sill, 3 fr high and 3 fr wide, is placed on the bottom of the channel, as shown in Figure P5.56. If the depth in the channel...

A 10-ft-wide rectangular channel carries 500 cfs at a depth of 7 ft. Now, a sill, 3 fr high and 3 fr wide, is placed on the bottom of the channel, as shown in Figure P5.56. If the depth in the channel immediately downstream of the channel is 6.5 fr, what is the resultant hydrodynamic force acting on the sill?