2.0

Table Of Contents
Chapter 6 Working with Pipes
626
Using the Mannings n Formula
Use the Mannings n dialog box to enter a description and an associated
Mannings n pipe coefficient value. These values are used by the Pipes Run
Editor when calculating flow and sizing pipes.
To use the Mannings n formula dialog box
1 From the Select Coefficient Table dialog box, click the Mannings n button to
open the Mannings n dialog box.
For more information, see Customizing the Roughness Coefficient Tables
earlier in this chapter. The Mannings n data is stored in a file called mann.cof,
located in the \pipewks folder for the current project. When you create a new
project, the mann.cof file is copied from a sample default file in the c:\Program
Files\Land Desktop R2\land\prot\pipewks program folder. You can use an
ASCII text editor to modify this data file as necessary.
2 Use the Description field to type the pipe material description.
3 Use the Coefficient field to type the Mannings n roughness coefficient value for
the pipe material.
Use the /\ button to move the cursor up one row, the \/ button to move the
cursor down one row, the PgUp button to move the cursor up one page, and the
PgDn button to move the cursor down one page. Use the Home button to move
the cursor to the first cell, the End button to move the cursor to the last cell,
and the Delete button to delete the row for the current cell.
By entering data for a new row and clicking OK, the new row is saved. Also, if
you change a value and click OK, the mann.cof file is updated with the new
information.