Figure below shows the section of a channel with flood way. Manning coefficient is taken as 0.025 for the main channel and 0.035 for the flood way. Knowing that the bed slope is 10 cm/km, calculate the discharge. Also state the type of flow (subcritical or supercritical). using Horton method to estimate the effective Mannings roughness. lood way 2.0 flood way/ All dimensions are in (m) Main channel 3.0 Q 60 12.0 0.75 Note to scale

Figure below shows the section of a channel with flood way. Manning coefficient is taken as 0.025 for the main channel and 0.035 for the flood way. Knowing that the bed slope is 10 cm/km, calculate the discharge. Also state the type of flow (subcritical or supercritical). using Horton method to estimate the effective Mannings roughness. lood way 2.0 flood way/ All dimensions are in (m) Main channel 3.0 Q 60 12.0 0.75 Note to scale

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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2.1. A trapezoidal channel conveys 15 m³/s of water on a bed slope of 1 in 300. The base width of the channel is 5 m and the side slope is 2 m. Assume a Manning's roughness coefficient (n) of 0.018. Calculate: (a) Calculate the normal flow depth and discharge. (b) Calculate Reynold's and Froude Numbers. (c) Comment on the applicability of Manning's Equation.
Design a trapezodial channel to carry a discharge of 47.4^3/s. The bottom slip of this the channel is 0.0074. Also the flow depth is half of channel bottom width. Take roughness coefficient as 0.024 Andy side slop as 1 horizontal to 4 verticals. B. Based on the given information and your results in part A, compute the state of flow
A. Design a trapezoidal channel to carry a discharge of 10.5 m^3/s. The bottom slop of the channel is 0.0035. Also the flow depth is half of the channel bottom width. Take roughness coefficient as 0.025 and side slop as 1H to 4V. B. Based on the given information and your results in part A, compute the state of flow
Note: Use excel to solve it. Thank you
The Pavlovskii and Yen equivalent roughness equations (ne) are attached (second and last equations), please ignore the other formulas besides those two.
Q-OCF A rectangular open channel has a width of 5m and a bed slope of 0.001. For a uniform flow of depth 2m, the velocity is 2m/s. What is the Manning's roughness coefficient for the channel?
a. A rectangular channel is 4 m wide and has a longitudinal slope of 0.002. The channel is poured concrete and it is discharging a uniform flow at 25 m3/s. What is the normal depth? Use Table C-4 for the roughness coefficient. Table C-4. Average Manning Roughness Coefficients for Larger Open Channels Channel Manning Roughness Coefficient(n) Unlined Channels Clay Loam Sand Lined Channels Grass Lined (well maintained) Grass Lined (not maintained) Wetland-Bottom Channels (New Channel) 0.023 0.020 0.035 0.045 0.023 Wetland-Bottom Channels (Mature Channel) See Table A-5 Riprap-Lined Channels See Chapter 7, Section 7.6.17 Concrete (Poured) 0.014 Air Blown Mortar (Gunite or Shotcrete)(¹) 0.016 Asphaltic Concrete or Bituminous Plant Mix 0.018 (¹) For air blown concrete, use n=0.012 (if troweled) and n=0.025 if purposely roughened. Note: For channels with revetments or multiple lining types, use composite Manning roughness coefficient based on component lining materials.
Read the question carefully and give me both a&b right solutions. A 1.3-m wide rectangular channel with a bed slope of 0.00019 has a depth of flow of 0.8m. Manning’s roughness coefficient is 0.017. (a) Can Manning’s equation be applied to this system (i.e., is the flow fully turbulent)? (b) Regardless of the answer to part a, determine the steady uniform discharge in the channel.
Note: Give me all three subparts right solutions A 4 m wide concrete rectangular channel with bed slope of 0.0004 has a steady discharge of 5 m3 /s. The mannings roughness constant (n) is 0.012. a) Determine the normal depth of flow using Newton Raphson method. Use initial trial depth as 0.8 m(only two iterations are required). b) Determine critical depth of flow. c) Classify the channel bed slope if it is mild, critical or steep slope.
Please help with last part, Approximately how far upstream of this section would you expect to find uniform flow?
(b) A channel is to be designed for carrying a discharge of 50 m/s, side slope 0.5:1 and silt factor 1.0. Calculate the longitudinal slope of the channel also.
3) b) The normal depth of flow in a 5.0 m wide rectangular channel shown in Figure 3 below is 1.0 m. The channel is laid at a slope of Im/km and has Manning's n of 0.02. Calculate the discharge and velocity in this channel associated with normal flow conditions. c) At a point downstream of that in part (b) above, there is a weir, Az is 0.5 m in height. If the section properties of the channel remains the same as in part (b), determine yı the depth of flow just before the weir. Assume negligible headloss across the weir and critical flow occurs over the weir. (yı lies between 1.2- 1.3 m) YA AZ Y2 Y2 for Q = const AZ Figure 3- Question 3 (b) and 3 (c)