This table lists all the data fields for a Pressure Related Demand Curve. Some of them can be viewed and edited on the PRD Curve Grid View of the Nodes Grid.
There are a number of built in curves displayed in the PRD Curve Grid View. Fields cannot be edited for built in curves.
Once a User Defined curve has been added to the PRD Curve Grid View, fields can be viewed and edited on the PRD Curve Property Sheet, which also displays a graph of the curve.
Further information, including units details, about all the Network Object fields stored in the database can be found in the Network Data Fields topic.
PRD Curve Data
Database Table Name: wn_prd_curve
|
Field Name |
Help Text |
Flag |
Grid |
Property Page |
Size |
Precision |
Units |
Database Field |
Data Type |
Default |
Error Lower Limit |
Error Upper Limit |
Warning Lower Limit |
Warning Upper Limit |
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Curve Values |
Table of values describing the relationship between Demand Factor and Pressure Ratio. See the PRD Curves topic for further information. Database Table Name: wn_prd_values
|
NO |
YES |
1 |
|
0 |
|
curve |
Array |
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|
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Curve ID |
Name of curve (limited to 30 characters) |
YES |
YES |
1 |
30 |
|
|
curve_id |
Text |
|
|
|
|
|
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Description |
Optional text to be entered by user |
YES |
YES |
1 |
80 |
|
|
description |
Text |
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|
|
|
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Power Law Exponent |
Available when creating a user defined PRD Curve. Check the Power check box to automatically generate a curve using the Power Law. A default Power Law Exponent of 1.118 will be used. Change the Power value if required and click Apply to recalculate the curve. The recommended range of Power values is 0.5 to 1.5. Curve. Check the Power check box to automatically generate a curve using the Power Law. A default Power Law Exponent of 1.118 will be used. Change the Power value if required and click Apply to recalculate the curve. |
YES |
YES |
1 |
|
3 |
|
power |
Double |
1.118 |
0.5 |
2.5 |
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Notes |
You can keep freeform notes about any object in your network. The notes field can be up to 64,000 characters in size, or about 10 pages of printed text. |
NO |
YES |
2 |
|
0 |
|
notes |
Memo |
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Curve Type |
Either "Builtin" or "User Defined"
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NO |
YES |
NO |
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user_defined |
Boolean |
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Relationship |
Description of the type of equation used to define the curve
|
YES |
YES |
NO |
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|
relationship |
Integer |
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