Print this page Design of Roadside Channels with Flexible Linings
Vincent D. Reynolds, MBA, P.E.
Course Outline
This 9 hour course will cover the design procedures for vegetative linings, manufactured linings (RECPs), gravel linings, gabion mattress linings, and others. Several examples and calculations will be presented to aid in understanding the course material.
This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of course materials.
Learning Objective
At the conclusion of this course, the student would have learned the following:
- Advantages of using flexible linings;
- Best flow conditions for flexible linings;
- Long-term installation of flexible linings;
- Advantages of rigid linings;
- Best flexible linings for roadside channels;
- Best linings for steep grades and channel side slopes;
- Size of aggregate in gravel mulch;
- The functions of turf reinforcement;
- How to classify open-channel flow;
- How shear stress is distributed along the wetted perimeter;
- The typical manning’s roughness coefficient for concrete;
- The return period used to determine design flow rates for permanent roadside and median drainage channel linings;
- How to determine the maximum shear stress on a channel bottom;
- The phenomenon of flow in very large channels;
- The shape of most highway drainage channels;
- How to determine the flow rate through a channel;
- How shear stress plays a role in soil erosion;
- How to determine the maximum shear stress on the side of a channel;
- How to determine the permissible shear stress;
- How to place flexible channels of different materials in a channel for the most effective erosion control;
- How to determine the maximum shear stress in a bend;
- How to determine the tractive force;
- How to calculate freeboard;
- The various retardance classes and their resistance to flow;
- How to define normal depth;
- How to determine the grass roughness coefficient;
- How shear stress relates to soil grain size;
- How to determine the density of a grass liner;
- The biomechanical properties of grass;
- How shear stress is related to the soil plasticity index;
- Various rolled erosion control products;
- The value of the Reynolds number related to turbulent flow;
- The size of riprap material;
- How to calculate the tractive force ratio;
- The angle of repose for various riprap; and
- How gabions are used for erosion control.
Intended Audience and Benefit
This course is intended for those wanting an understanding of the Design of Roadside Channels with Flexible Linings. It could be especially useful for professionals working in Transportation, hydrology, hydraulics, site design and geotechnical engineering, as well as construction professionals.
This course is designed so that the intended audience will benefit immediately with the information to design efficient roadside channels with flexible linings.
Course Introduction
Roadside channels collect water from the roadway and adjacent areas and deliver it to a body of water. Channels can become stressed from the flow of water; the stress that occurs is determined by soil type, channel slope and depth of flow. Flexible linings can be used to counter the stress in roadside channels resulting from the flow of water. There are various types of flexible linings, including long-term such as riprap, and gravel, and temporary such as unreinforced vegetation.
Course Content
This course will cover the design procedures for vegetative linings, manufactured linings (RECPs), gravel linings, gabion mattress linings, and others. Several examples and calculations will be presented to aid in understanding the course material.
Design of Roadside Channels with Flexible Linings
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Course Summary
This course contains very useful knowledge can be utilized by the engineer and designer to implement efficient roadside channels with flexible linings.
Using good engineering judgment is always paramount in any situation. Utilizing good judgment and the knowledge gained in this course will aid the reader with the knowledge to be a success in the design of roadside channels with flexible linings.
Related Links
For additional technical information related to this subject, please visit the following websites:
Federal Highway Administration:
http://www.fhwa.dot.gov/
Transportation Research Board:
http://www.trb.com
AASHTO:
www.transportation.com
Quiz
Once you finish studying the above course content, you need to take a quiz to obtain the PDH credits.
DISCLAIMER: The materials contained in the online course are not intended as a representation or warranty on the part of PDH Center or any other person/organization named herein. The materials are for general information only. They are not a substitute for competent professional advice. Application of this information to a specific project should be reviewed by a registered architect and/or professional engineer/surveyor. Anyone making use of the information set forth herein does so at their own risk and assumes any and all resulting liability arising therefrom.
