Channel Shape Data Fields

Channel Shape data can be edited on either the Channel Shape Grid Window of the Links Grid or the Channel Shape Property Sheet.

To view and edit all channel shape data, use the Property Sheet.

This table describes all the channel shape specific data which can be used to define a reusable channel shape.

The Channel Shape Properties Window allows you to view and edit the parameters for a single Shape when launched from the related Channel Properties Window.

Common Data Fields

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

Channel Shape Data

Database Table Name: hw_channel_shape

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

Shape ID

Unique identifier for the channel shape.

shape_id

Text

Roughness type

Either CW (Colebrook-White) or Manning equations for hydraulic roughness

Database Value

Description

Help Text

MANNING

Manning's 1/n

Enter the 1/n value for the Manning's equation.

Using 1/n as input to the Manning's equation is a common practice as 1/n is normally a more manageable number

Manning's n

Enter the n value for the Manning's equation

Colebrook White

Enter the Ks value for the Colebrook White equation

roughness_type

Text

Channel profile

This field contains a series of records defining the channel cross section

Database Table Name: hw_chan_profile

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

Position in Data Structure	Field Name	Help Text	Database Field	Data Type	Units	Error Lower Limit	Warning Lower Limit
1	X Coordinate	You define X coordinate values in ascending value. The first value represents the left bank of the channel when looking downstream. You can represent a vertical section by having two consecutive points with the same X value but different depth values. The origin can be defined arbitrarily. For example, you might define the origin at the left bank, so that all the coordinate values are greater than zero, or you may define the origin at the centre of the channel, so that the left bank co-ordinate is negative and the right bank positive	X	Double	L
2	Depth	This field represents the depth at this point in the channel from the bottom of the channel. The lowest point in the channel must therefore have a depth of zero	Z	Double	L	0	0
3	Roughness Colebrook-White	Roughness value used when Roughness type is set to CW (Colebrook White) Enter the 1/n value for the Manning's equation The roughness value applies from this point on the section to the next point. The points are organised by increasing X value. Therefore, the value on the last entry in the table will have no effect. A value of zero is valid. You use it to represent sections of the channel that store, but do not convey flow (for example, flood plains)	roughness_CW	Double	RCW	0	0
4	Roughness Manning's	Roughness value used when Roughness type is set to Manning (Manning's 1/n) Enter the 1/n value for the Manning's equation The roughness value applies between the point at which it is defined and the next point along the section. This means that the last value of Manning's 1/n will have no effect, but it still needs to be defined. A value of zero is valid. You use it to represent sections of the channel that store, but do not convey flow (for example, flood plains)	roughness_Manning	Double		0	0
5	Roughness Manning's n	Roughness value used when Roughness type is set to N (Manning's n) Enter the n value for the Manning's equation. The roughness value applies between the point at which it is defined and the next point along the section. This means that the last value of Manning's n will have no effect, but it still needs to be defined. A value of zero is valid. You use it to represent sections of the channel that store, but do not convey flow (for example, flood plains)	roughness_N	Double		0	0
6	New Panel	Tick this box to mark the start of a new conveyance panel. By definition, the first record is the start of the first panel in the section, so you don't need to tick it. For a river channel, you would typically define three panels: left flood plain main channel right flood plain	new_panel	Boolean

profile

Array

Channel Shape

Links Grid

Property Sheets