For the channel in problem 7.21, the initial downstream water elevation is 10 ft. a house is to be built at a distance of x = 2640 ft upstream of the bridge.
a) At what elevation should be house foundation be built to ensure 100-yr flood protection (neglect effects of the bridge)? The water velocity just downstream of the bridge.
b) Compute the head loss through the bridge according to the Yarnell equation (Eq. 7.37) using K = 0.95, a = 1/10, and the velocity just downstream of the bridge as computed in part (a).
c) Determine slab elevation of the house for flood safety, taking into account the effects of the bridge. Compare the slab elevation in part (a) to that computed in part (b). What effect (if any) does the bridge have on the slab elevation?