Flow Depth
This open channel flow calculator variable represents the depth of flow in the channel and should be entered in inches. Simply enter a new depth (e.g. 48 - to represent 48 inches or 4 ft) and the open channel flow, flow velocity, wetted perimeter, hydraulic radius, and Froude number are automatically calculated and shown in the grid. If a depth that exceeds the channel diameter is entered for circular channels, an error occurs and the grid shows "NAN" (not a number).
Manning's N
This open channel flow calculator variable represents the Manning's roughness coefficient. Even though the Manning's coefficient actually varies with
the flow depth, this variation is often ignored in open channel calculations and is therefore not considered in our calculations. Simply enter a new Manning's n (e.g. 0.013 for concrete channels) and the open channel flow, flow velocity, wetted perimeter, hydraulic radius, and Froude number are automatically calculated and shown in the grid.
Slope
This open channel flow calculator variable represents the longitudinal slope of the channel and should be entered as a ratio of the vertical rise per unit length. Simply enter a new slope (e.g. 0.2 to represent a 2 ft rise for every 100 ft horizontal distance) and the open channel flow, flow velocity, wetted perimeter, hydraulic radius, and Froude number are automatically
calculated and shown in the grid.
Side Slope
This open channel flow calculator variable represents the slopes of the sides or banks of the channel and should be entered as a ratio of the vertical rise of the channel sides or banks per unit length. Simply enter a new side slope (e.g. 3 to represent 3H: 1V) and the open channel flow, flow velocity, wetted perimeter, hydraulic radius, and Froude number are automatically
calculated and shown in the grid.
Diameter
This open channel flow calculator variable is used only with circular pipes and channels and represents the diameter of the channel entered in inches. Simply enter a new diameter (e.g. 48 - to represent 48 inches or 4 ft) that is not less than the flow depth and the open channel flow, flow velocity, wetted perimeter, hydraulic radius, and Froude number are automatically calculated and shown in the grid. If a diameter that is less that the channel depth is entered for circular channels an error occurs and the grid shows "NAN" (not a number).
Open Channel Flow Calculator Results
The input should be provided in english units. However, results are provided in english units as well as metric units. The calculator internally converts english unit results to meteric for display in the grid.
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