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Open Channel Flow Part I: The Manning Equation and Uniform Flow (AIA# TCEOC1) (2 credit hours)
 

Flow of a liquid may take place either as open channel flow or pressure flow.  Pressure flow takes place in a closed conduit such as a pipe, and pressure is the primary driving force for the flow.  For open channel flow, on the other hand the flowing liquid has a free surface at atmospheric pressure and the driving force is gravity.  Open channel flow takes place in natural channels like rivers and streams.  It also occurs in manmade channels such as those used to transport wastewater and in circular sewers flowing partially full.

 

In this course several aspects of open channel flow will be presented, discussed and illustrated with examples.  The main topic of this course is uniform open channel flow, in which the channel slope, liquid velocity and liquid depth remain constant.  First, however, several ways of classifying open channel flow will be presented and discussed briefly.

 

After completing this course you will have knowledge about the basic nature of flow in open channels and the common ways of classifying open channel flow (laminar or turbulent, steady state or unsteady state, uniform or non-uniform, and critical, subcritical or supercritical).  Practice in the use of the Manning equation for a variety of uniform open channel flow calculations will be gained through several worked examples.  Upon completing this course, you will be prepared to take more advanced open channel flow courses.

Harlan Bengtson
  • Know the differences between laminar & turbulent, steady state & unsteady state, and uniform & non-uniform open channel flow.
  • Be able to calculate the hydraulic radius for flow of a specified depth in an open channel with specified cross-sectional shape and size.
  • Be able to calculate the Reynolds Number for a specified open channel flow and determine whether the flow will be laminar or turbulent flow.
  • Be able to use tables such as the examples given in this course to determine a value for Manning roughness coefficient for flow in a manmade or natural open channel.
  • Be able to use the Manning Equation to calculate volumetric flow rate, average velocity, Manning roughness coefficient, or channel bottom slope, if given adequate information about a reach of open channel flow
  • Be able to use the Manning Equation, with an iterative procedure, to calculate normal depth for specified volumetric flow rate, channel bottom slope, channel shape & size, and Manning roughness coefficient for a reach of open channel flow
  • Be able to carry out a variety of calculations for full or partially full flow under gravity in a circular pipe.

  • Titan Continuing Education, Inc. | 1519 Dale Mabry Hwy, Ste 201 Lutz, FL 33548 | Toll Free: 800.960.8858 | Email: info@TitanCE.com .