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Chapter 5 Working with Hydrology Commands
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The following illustration shows circular pipe values:
Circular pipe values
3
In the Flowrate box, type a flow rate for the pipe (unless you are solving for the
flowrate).
4
In the Slope box, type a slope for the pipe (unless you are solving for the slope).
You can also click Select to specify the slope by selecting points on the drawing.
5
In the Mannings n box, type a roughness value for the pipe (unless you are
solving for the Mannings n). You can also click Select to select a coefficient
from the Channel - Mannings n dialog box.
6
In the Depth of Flow box, type a flow depth for the pipe (unless you are solving
for the depth of flow).
7
In the Diameter box, type the pipes diameter (unless you are solving for the
diameter). You can also click Select to choose the diameter from a table.
The box in the top-right area of the dialog box displays a graphic of the
currently defined pipe. Based on the values that you entered, information about
the pipe is calculated and displayed at the bottom left of the dialog box. This
information is for display only and cannot be edited.
The Percent Full value is calculated using the following formula:
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I
XOO
GHSWK RI
I
ORZ
KHLJKW
u

 
NOTE
If the data that you entered has an error, the pipe graphic image does not
display. Check for an error message at the bottom of the dialog box.
8
Click OK to exit the dialog box.
Specifying a Pipe Diameter
You can use the Pipe Selections table to select appropriate diameters for the pipe
calculation.
To specify a pipe diameter
1
In the Manning dialog box, click the Select button next to the Diameter text
box to display the Pipe Selections dialog box.
2
Select a pipe material and diameter by placing your cursor in the appropriate
column and clicking anywhere in the text box that contains the value you want
to use. Use the navigation buttons on the right side of the dialog box to move
through the list of descriptions and coefficients.