To create and edit curves which can be referenced by SWMM Controls go to Components/SWMM Extensions/Control Curves.

Control Commands

Control Curve Commands

The dimensions and units of the curve are determined by the control rules which reference it. For example, take the control statement from a control set which uses US – CFS, Ft, cubic Ft units:

RULE MC1

IF NODE N2 DEPTH >= 0

THEN WEIR W25 SETTING = CURVE C25

The curve has dimensions of Depth (ft) vs Setting (unitless).