A water stage elevation gauge is located at River Station cross-section 1.0 whic

Question

A water stage elevation gauge is located at River Station cross-section 1.0 which has measured the Water Surface Elevation to be 1505.0 ft for the 100-year storm. Based on this WSEL, the following information was already determined for you for cross-section 1.0:

Column 3: Computed WSEL = 1505 ft

Column 4: A = 596 ft2

Column 5: R = 3.25 ft

Column 6: You calculate

Column 7: You estimate Manning's n for main channel

Column 8: You calculate

Next, use the value of flow (Q) that you determined in the last homework (Q= 3,088 ft3/s), to complete Columns 15 and 16.

Then, compute the Water Surface Elevation (WSEL) for cross-section 2.0. For your first trial, use an assumed WSEL = 1509.89 ft and A = 342.24 ft2 and R = 3.20ft and a reach length of L= 450 ft. Determine the computed WSEL. It may not be within +/- 0.05 ft of your assumed WSEL of 1509.89 ft. STOP here. The purpose of this exercise is to appreciate the time and effort required for multiple iterations.

Explanation / Answer

we assumed n = 0.03

cross section WSEL assumed WSELcomputed A R R2/3 V2/2g slope hl V wetted perimiter 1 1505 1505.41 596 3.25 2.194 0.4168 ft 2,26 * 10-3 0.4144 5.1812 183.38 2 1509.89 1511.85 342.24 3.2 4.715 1.2639 ft 1.48 * 10-3 0.666 9.022 106.93

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