**Riprap-Lined Trapezoidal Channel Design****Objective:**Design a riprap-lined trapezoidal channel with the following specifications:- Capacity: 1,080 cubic feet per second (cfs)- Slope: 0.0008 feet per foot (ft/ft)- Method: NCHRP Report 108 Method- Material: Smooth rock- Maximum Channel Bottom Width: 15 feet (ft)**Tasks to be Completed:**1. Determine the riprap size.2. Calculate the side slopes.3. Establish the design depth of flow.The approach involves using the given parameters and the NCHRP Report 108 Method to ensure the design meets the specified requirements while maintaining structural integrity and flow efficiency.

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Design a riprap-lined trapezoidal channel that has a capacity of 1,080 cfs and a slope of 0.00008 0.0008 ft/ft using the NCHRP Report 108 Method. Smooth rock is to be used and the channel bottom width is not to exceed 15 ft. Determine the riprap size, the side slopes, and the design depth of flow.

Design a riprap-lined trapezoidal channel that has a capacity of 1,080 cfs and a slope of 0.00008 0.0008 ft/ft using the NCHRP Report 108 Method. Smooth rock is to be used and the channel bottom width is not to exceed 15 ft. Determine the riprap size, the side slopes, and the design depth of flow.

Structural Analysis

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Highway Drainage

Highway drainage is the process of extracting and regulating the excess surface water on the pavement by giving the desired slope. The construction of a highway drain helps to divert the water present on the surface, and sub-grade by the means of slope. Highway drainage systems are a necessary part of smooth functioning of traffic, since the highway drainage systems provide proper disposal of unwanted substances from the highways.

Question

**Riprap-Lined Trapezoidal Channel Design**

**Objective:**
Design a riprap-lined trapezoidal channel with the following specifications:
- Capacity: 1,080 cubic feet per second (cfs)
- Slope: 0.0008 feet per foot (ft/ft)
- Method: NCHRP Report 108 Method
- Material: Smooth rock
- Maximum Channel Bottom Width: 15 feet (ft)

**Tasks to be Completed:**
1. Determine the riprap size.
2. Calculate the side slopes.
3. Establish the design depth of flow.

The approach involves using the given parameters and the NCHRP Report 108 Method to ensure the design meets the specified requirements while maintaining structural integrity and flow efficiency.

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Step 1: Given Data

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Step 2: Determine trial size of riprap

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Step 3: Angle of repose

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Step 4: Critical shear stresses

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Step 5: Depth of flow (y)

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Step 6: Check for max stresses

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