	Product(s):	SewerCAD, SewerGEMS
	Version(s):	08.11.xx.xx, 10.XX.XX.XX
	Area:	Output and Reporting

Problem

Why do my pump results look different depending on the reporting time step and hydraulic or hydrologic time step?

Why does the flow in a gravity subnetwork downstream of the pump look different from the pump flow?

Problem ID#: 47023

Solution

The program will report results largely based on settings in your calculation options. However it is possible for something to occur between time step. For instance, if a pump is cycling on and off quickly, some of the cycles may occur between time steps. This can give the appearance that the pump is not operating based on the controls or that the results downstream are not matching with the pump flow.

You can try adjusting the settings in the calculation options to help with this. To view the calculation option properties, go to Analysis > Calculation Options and double clicking on the active calculation option set.

There are a number of different time step options available. The hydraulic time step is the length of the calculation time step. If you look at the data tab of the graphical output, you will see the time column reflects this increment. The hydrologic time step is the routing increment used to generate hydrographs in gravity systems (and the time increment in pressure portions of a system). If you have the reporting time step set to <All>, the graphical results will reflect this increment. The reporting time step allows you to save output for different time steps.

Using smaller values for the hydraulic and hydrologic time steps can help see flow that was occurring between time steps.

Why do my pump results look different depending on the reporting time step and hydraulic/hydrologic

Problem

Solution

See Also