FlowMaster Tutorial 3 – Open Channel Flow

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FlowMaster Tutorial 3 – Open Channel Flow


FlowMaster is an easy-to-use program that helps civil engineers with the hydraulic design and analysis of pipes, gutters, inlets, ditches, open channels, weirs, and orifices. FlowMaster computes flows and pressures in conduits and channels using common head loss equations such as Darcy-Weisbach, Manning’s, Kutter’s, and Hazen-Williams. The  program’s flexibility allows the user to choose an unknown variable and automatically compute the solution after entering known parameters. FlowMaster also calculates rating tables and plots curves and cross-sections. You can view the output on the screen, copy it to the Windows clipboard, save it to a file, or print it on any standard printer. FlowMaster data can also be viewed and edited using tabular reports called Flex Tables.

FlowMaster enables you to create an unlimited number of worksheets to analyze uniform  pressure-pipe or open-channel sections, including irregular sections (such as natural streams or odd-shaped man-made sections). FlowMaster does not work with networked systems such as a storm sewer network or a pressure pipe network. For these types of analyses, StormCAD, WaterGEMS, or SewerCAD should be used instead.

FlowMaster replaces solutions such as nomographs, spreadsheets, and BASIC programs. Because FlowMaster gives you immediate results, you can quickly generate output for a large number of situations. For example, you can use FlowMaster to :

  • Analyze various hydraulic designs
  • Evaluate different kinds of flow elements
  • Generate professional-looking reports for clients and review agencies

Problem Statement

A 450-mm circular concrete (n = 0.013) pipe constructed on a 0.6-percent slope carries 0.1 m3/s.

  • Using Manning’s equation and normal depth assumptions, what are the depth and velocity of flow ?
  • What would the velocity and depth be if the pipe were constructed of corrugated metal (n = 0.024) instead of concrete ?

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