Determine a suitable rectangular flexible lined channel to resist erosion for a maximum flow of 20 ft3/sec if the channel slope is 2%. Use channel dimensions given in Problem 16-15.
What will be an ideal response?
To allow a free board of 1 ft, the revised channel dimension is:
1.62 ft × 6 ft
Determine if a channel lined with jute mesh is suitable to prevent erosion.
Using Figure 16.9, determine dmax
dmax = 0.62 ft
Determine the hydraulic radius, R
R = a /p
R = (0.62)(6.0) / [(2)(0.62) + (6.0)]
R = 0.51 ft
Determine the flow velocity, V, using Figure 16.13.
V = 61.53 R1.028 S00.431
V = 61.53(0.51)1.028(0.02)0.431
V = 5.75 ft / sec
Determine the flow.
Q = VA
Q = (5.75)((0.62)(6.0))
Q = 21.4 ft3 / sec
Since the allowable flow rate for this material is slightly greater than the flow
required, the channel design using jute mesh is adequate.
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