| Product(s): | SewerGEMS, SewerCAD, StormCAD, CivilStorm |
| Version(s): | 08.11.XX.XX, 10.00.XX.XX |
| Area: | Calculations |
Problem
How can I change the pressure friction method used in a storm/sewer model?
Solution
The pressure friction method can be defined from the calculation options properties.
To access this dialog go to the Analysis menu and select Calculation Options. Then double-click on the calculation option you want to edit. The calculation option being used by the active scenario will display a red check mark on its icon.
The following chart lists which pressure friction methods are available for each solver in the storm/sewer products.
|
Solver |
Darcy-Weisbach |
Hazen-Williams |
Kutters |
Mannings |
|
GVF-Convex* |
Yes |
Yes |
No |
Yes |
|
GVF-Rational** |
Yes |
Yes |
No |
Yes |
|
Explicit (SWMM) |
Yes |
Yes |
Yes |
Yes |
|
Implicit (Dynamic Wave) |
Yes |
Yes |
Yes |
Yes |
* With the GVF-Convex solver, the Gravity Friction Method is used for all gravity elements, even if the conduit is under pressure
** When using the GVF-Rational solver pressure pipes are treated as conduits. Pressure pipe roughness is converted to conduit roughness and no pressure loops are allowed.
See Also
Selecting the Gravity Friction Method in SewerGEMS and CivilStorm
Differences between solvers: GVF-Convex vs. GVF-Rational vs. Implicit vs. Explicit (SWMM)
How are Pressure Pipes handled in the different solvers in SewerGEMS ?