Pump Curve Data Fields (SWMM)

A pump curve in a SWMM network is used to define the relationship between a pump's flow rate and conditions at the inlet and, where applicable, the outlet sides of the pump.

Information relating to pump curves can be viewed and edited on the Pump Curve Grid Window of the Links Grids or on the Pump Curve Property Sheet.

Most data can be edited on the grid, but some fields cannot be displayed in the grid format.

To view and edit all pump curve data, use the Property Sheet.

The table below describes all the data which can be used to define a pump curve. For details of results fields for links, see the Link Results Data Fields (SWMM) topic.

Common Data Fields

Fields that are common to the majority of objects can be found in the Common Fields topic.

Pump Curve Data

Database Table Name: sw_curve_pump

Field Name

Help Text

Database Field

Data Type

Size

Units

Precision

Default

Error Lower Limit

Error Upper Limit

Warning Lower Limit

Warning Upper Limit

Curve ID

A unique name for this pump curve, up to 254 letters, numbers and underscore characters. Upper and lower case letters are treated as being the same.

This name cannot be used by any other curve in the same SWMM network.

Text

254

Pump curve type

The type of pump curve. The following options are available:

PUMP 1 (Inlet volume increment) – flow increases incrementally with volume at the inlet side of the pump
PUMP 2 (Inlet depth increment) - flow increases incrementally with depth at the inlet side of the pump
PUMP 3 (Head difference) - flow varies continuously with head difference between the inlet and outlet sides of the pump
PUMP 4 (Continuous depth) - flow varies continuously with depth at the inlet side of the pump

Examples of incremental and continuous curves are shown below:


Incremental flow	Continuous flow

type

Text

PUMP1

Inlet volume increment array

Displayed only when Pump curve type is set to PUMP 1.

This field contains a series of records defining the data for a PUMP 1 type of curve. These are entered on the Curves Editor which is displayed by clicking on the button.

Database Table Name: sw_curve_pump1_data

Show Columns	Database Names
	Size, Type and Units
	Defaults and Error Limits

Field Name	Help Text	Database Field	Data Type	Size	Units	Precision	Default	Error Lower Limit	Error Upper Limit	Warning Lower Limit	Warning Upper Limit
Inlet volume increment	The volume of water at the inlet.	volume_increment	Double		VO	3
Flow	The corresponding flow at this volume.	outflow	Double		Q	3

data

Structure

Inlet depth increment array

Displayed only when Pump curve type is set to PUMP 2.

This field contains a series of records defining the data for a PUMP 2 type of curve. These are entered on the Curves Editor which is displayed by clicking on the button.

Database Table Name: sw_curve_pump2_data

Show Columns	Database Names
	Size, Type and Units
	Defaults and Error Limits

Field Name	Help Text	Database Field	Data Type	Size	Units	Precision	Default	Error Lower Limit	Error Upper Limit	Warning Lower Limit	Warning Upper Limit
Inlet depth increment	The depth of water at the pump inlet.	depth_increment	Double		Y	3
Flow	The corresponding flow at this depth.	outflow	Double		Q	3

The Inlet depth increment entries are extended until the next defined increment and then step up.

data

Structure

Head difference array

Displayed only when Pump curve type is set to PUMP 3.

This field contains a series of records defining the data for a PUMP 3 type of curve. These are entered on the Curves Editor which is displayed by clicking on the button.

Database Table Name: sw_curve_pump3_data

Show Columns	Database Names
	Size, Type and Units
	Defaults and Error Limits

Field Name	Help Text	Database Field	Data Type	Size	Units	Precision	Default	Error Lower Limit	Error Upper Limit	Warning Lower Limit	Warning Upper Limit
Head difference	The head difference between the inlet and outlet sides of the pump.	head_difference	Double		Y	3
Flow	The corresponding flow at this head difference.	outflow	Double		Q	3

data

Structure

Continuous depth array

Displayed only when Pump curve type is set to PUMP 4.

This field contains a series of records defining the data for a PUMP 4 type of curve. These are entered on the Curves Editor which is displayed by clicking on the button.

Database Table Name: sw_curve_pump4_data

Show Columns	Database Names
	Size, Type and Units
	Defaults and Error Limits

Field Name	Help Text	Database Field	Data Type	Size	Units	Precision	Default	Error Lower Limit	Error Upper Limit	Warning Lower Limit	Warning Upper Limit
Continuous depth	The depth of water at the pump inlet.	continous_depth	Double		Y	3
Flow	The corresponding flow at this depth.	outflow	Double		Q	3

data

Structure

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InfoWorks^® ICM version 2023.2 - Issued 22 May 2023

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