In an InfoWorks network, a headloss condition must be specified at each end of a conduit. The headloss condition represents the extra energy loss due to turbulence at a manhole or junction. Any of the following built in headloss conditions may be specified:
- No headloss
- Normal manhole headloss
- High manhole headloss
- Fixed headloss
or a headloss curve can be defined using the Headloss Curve Grid Window of the Links Grid and Headloss Curve Property Sheet in InfoWorks ICM or ICMLive Configuration Manager .
The following table describes all the specific data used to define a Headloss Curve.
Fields that are common to the majority of objects can be found in the Common Fields topic.
Headloss Curve Data
Database Table Name: hw_headloss
| Field Name | Help Text |
Database Field |
Data Type |
Size |
Units |
Precision |
Default |
Error Lower Limit |
Error Upper Limit |
Warning Lower Limit |
Warning Upper Limit |
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Headloss ID |
Name for the Headloss Curve - maximum 32 characters |
headloss_type |
Text |
64 |
|
0 |
|
|
|
|
|
|
Curve Type |
Read-only field. The only possible values are Built-in and User. Only User type of Headloss Curves can be edited. |
curve_type |
Text |
7 |
|
0 |
User |
|
|
|
|
|
Minimum surcharge ratio |
The value entered in the minimum surcharge ratio field will be used as the first Ratio value in the Ratio / Value (K) grid. |
min_surcharge_ratio |
Double |
|
|
4 |
|
0 |
|
|
|
|
Surcharge ratio step |
The Ratio values in the Ratio / Value (K) grid will be incremented by the surcharge ratio step for each K value entered in the grid. |
surcharge_ratio_step |
Double |
|
|
4 |
|
0.00001 |
|
|
|
|
Surcharge ratio factor array |
A series of headloss factor values against surcharge ratio values, displayed in a Ratio / Value (K) grid. |
surcharge_ratio_factor_array |
Array |
|
|
4 |
|
0 |
|
|
|
|
Minimum velocity |
The value entered in the minimum velocity field will be used as the first Velocity value in the velocity / value grid |
min_velocity |
Double |
|
V |
4 |
|
|
|
|
|
|
Velocity step |
The velocity ratio values in the velocity / value grid will be incremented by the minimum velocity step for each velocity ratio value entered in the grid. |
velocity_step |
Double |
|
V |
4 |
|
0.00001 |
|
|
|
|
Velocity factor array |
A series of velocity ratio values against velocity values, displayed in a velocity / ratio grid. |
velocity_factor_array |
Array |
|
|
4 |
|
|
|
|
|
|
Notes |
Freeform notes can be kept about any object in the network. The notes field can be up to 64,000 characters in size, or about 10 pages of printed text. |
notes |
Memo |
|
|
0 |
|
|
|
|
|