A 20-fr-wide rectangular channel is crossed by a bridge which is supported by 3-fi: square piers as shown in Figure P5.57. The discharge in the channel is 1000 cfs and the depth upstream of the piers...

A 20-fr-wide rectangular channel is crossed by a bridge which is supported by 3-fi: square piers as shown in Figure P5.57. The discharge in the channel is 1000 cfs and the depth upstream of the piers is 10 ft. If the depth just downstream is 9.5 ft, what is the total resultant force acting on each pier? What is the resultant hydrostatic force on each pier?