Product(s):	SewerGEMS, CivilStorm
Version(s):	CONNECT Edition, V8i
Area:	Layout and Data Input

Problem

What is the difference between the "Depth vs Flow" (type 2) pump definition and the "Depth Flow (Simulated Variable Speed)" pump definition?

Note that these two pump definition types are only available with the Implicit and Explicit numerical solvers, and are therefore only available in SewerGEMS and CivilStorm.

 

Solution

The only difference is the "Depth vs. Flow" is meant to be used to simulate an inline pump where the flow increases incrementally (a step-wise function) whereas, the "Depth Flow (VSP simulated)" type is used to model a variable speed inline pump where the flow varies continuously (a smooth curve).

If you are trying to simulate a Variable Speed Pump (VSP) it is recommended that you use the depth flow (VSP simulated) type.

Note that the "Depth" refers to the inlet node depth (typically a wetwell on the upstream side of the pump).

See Also

Modeling Variable Speed Pumps (VSP) and Variable Speed Pump Batteries (VSPB) In Storm and Sewer Products

How are pumps handled in each OpenFlows product?

Which Pump Definition Types can be used by the GVF-Convex, Implicit and Explicit solvers?

"The Depth-Flow, Depth-Flow (Simulated Variable Speed) and Volume-Flow pump definition types are unsupported"

Differences between solvers: GVF-Convex vs. GVF-Rational vs. Implicit vs. Explicit (SWMM)