Read the question carefully and give me both right solutions according to the question 2- A trapezoidal channel lined with Bermuda grass has a bottom width of b= 7 ft, side slopes of m = 2.5and a longitudinal bottom slope of So =0.0009. Determine the normal flow depth in the channel for Q=70 cfs if:(a) the grass has a good stand and is about 30 cm tall(b) the grass is cut to about 4 cm

Answered: Image /qna-images/answer/1b3d9a52-0ec6-4040-b2d0-7d868ebb5fe4.jpg

Answered: 2- A trapezoidal channel lined with…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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There is a rectangular channel that will be excavated downstream of a dam after a stilling basin both with a width of 15 meters. The depth of the wather flow upstream of the dam is 4.27 meters and the discharge flow above the dam is 112.5 cubic meters per second. the channel wil be excavated in earth and n = .o25 and maintains a uniform flow depth under a subcritical flow regime. I need to determine 1. the bottom channel slope needed in the downstream channel and 2. the length of the stilling basin if the dissipation stucture starts at dissipated along the structure. The design should consider that the flow depth at the end of the still basin is similar to the flow depth in the channel. For a more realistic approach in the design, the head loss between the station upstream of the dam and the station at the beginning of the still basin is 10% of the velocity head observed at the beginning of the basin
A flow of 30 m3 /s occurs in a trapezoidal channel having a base width of 3 m, side slopes 1 vertical to 2 horizontal. Determine the critical depth, yc.
An open channel is V-shaped, each side being inclined at 45 degrees to thevertical. If the flow rate is 3 m3/s when the depth of water at the centre is 0.52m, calculate the slope of the bed of the channel. Use Manning’s coefficient n =0.013.
The width and the depth of flow in a triangular channel is 4 m and 1 m respectively. The velocities on the centre line at 0.2 m and 0.8 m below the water surface are 0.6 m/s and 0.4 m/s respectively. Determine the dishcarge in the channel.
The bed width of a trapezoidal channel is 5.0 m, 5,= 0.0004, the side slope is m = 2 horizontal: 1 vertical, and the n value is 0.02: y = 3.0 m is the normal depth of flow. Calculate and plot the resulting gradually varied flow using the direct step method, when the channel flows into a pool at the downstream end and the pool elevation is 1.25 m higher than the channel bed elevation at the downstream end. Estimate the length of the gradually varied flow that the pool elevation produces.
Horizontal rectangular channel (4 m) wide is carrying a discharge of 20 m3/s at a depth of 2.5 m. If the channel width is reduced linearly from 4 m to 3 m in length of 5 m, determine the flow depth at the location where the channel width is 3.5 m. Assume there are no losses in the contraction
A trapezoidal channel is 10.0 m wide at the base and has a side slope of 4 horizontal to 3 verticals. The bed slope is 0.002, The channel is lined with smooth concrete (Manning's N = 0.012). The hydraulic radius (in m) for a depth of flow of 3 m is-
A concrete lined circular channel of 3 m diameter has a bed slope of 1 in 500. Determine the velocity in m/s for the condition of maximum discharge. Take Chezy’s constant C = 50.
An unsymmetrical trapezoidal channel of most efficient section with one side inclined from horizontal by 35 and the other inclined from vertical by 40 is to be designed to carry a 1.0 cubic meters per second discharge. Determine the flow stage type on the channel if roughness coefficient is 0.030 and average longitudinal slope is 0.175. Use Manning’s equation.
Q3) A rectangular channel of width 5.0 m carries a discharge of 10 m3/s. The normal depth of flow is 1.25m. A smooth upwards step of height 0.2 m occurs in the bed of the channel. Determine the depth of flow downstream of the rise in the bed, and the depression of the water surface. Determine the maximum permissible height of the step if the water level upstream is to remain unaffected
A trapezoidal channel having a bottom width of 6.1 m and side slopes of 1.5H : 1 V is carrying a flow of 126 m3/s at a flow depth of 5.79 m. The bottom slope is 0.00008, Manning n = 0.013 and the channel length is 5 km. There is constant-level reservoir at the upstream end of the channel. A sluice gate at the downstream end is suddenly closed at time t = 0 s. (a) Compute the transient conditions until t = 2000 s by using the method of characteristics. (b) Plot the computed flow depth in the channel at t = 0, 500, 1000, 1500 and 2000 s. (c) Plot the variation of the flow depth with time at 1.5, 2.5, 3.0 and 5.0 km from the reservoir. (d) By using different values of Δt/Δx, investigate the effect of interpolation error on the computed wave height and wave shape. (e) Show that the method of characteristic fails when a shock or bore is formed when the gate is closed in 10 s and the wave propagates in the channel.
Consider a concrete (n = 0.014) wide rectangular channel that discharges 2.7 m^3/s per unit width of flow. The channel bottom slope is 0.0002. There is a step rise of 0.15 m. Determine the flow depth downstream of the step assuming no transition losses. Does the water rise or fall at the step?

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