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7.10. Determine the local change in water surface elevation caused by a 0.2-ft-highobstruction in the bottom of a 10-ft-wide rectangular channel on a slope of0.0005 ft/ft. The rate of flow

is 20 cfs and the unobstructed flow depth is 0.9 ft.(See Fig. P7-10). Assume no head loss.

Fig: 1

Fig: 2