Check Files 1d hydroprop

This file contains information on the hydraulic properties of the 1D channels.

Attributes of hydprop_check

Attribute Name	Attribute Description
ID	The channel ID.
US_Node_ID	The upstream node ID for the channel.
DS_Node_ID	The downstream node ID for the channel.
Channel_Type	The channel type, see TUFLOW manual for a list of channel types. For example an "S" type channel is a standard open channel, an "R" type channel is a rectangular culvert.
Manning_n	The primary Manning's n value for the channel. If this varies across the channel, e.g. an open channel with cross-section, the Manning's n value at the lowest point is reported. For some new structures this is the Cd coefficient.
Elev_at_Top	The highest elevation in the channel, for an open channel, this is the high point in the cross-section. For a structure the average channel obvert is output (calculated by adding the pipe height to the upstream and downstream invert levels and taking the average). Note that the water level can rise above this. See the .ecf command Depth Limit Factor == for more information on this.
Depth	The depth of the channel at the top elevation (see above).
Flow_Width	The flow width at the top of channel.
Storage_Width	The storage width at the top of the channel.
Flow_Area	The flow area at the top of the channel.
Conveyance	The conveyance value at the top of the channel. This is -1 for structure channels.

The hydraulic properties at the top of the channel can be very useful to map to ensure there are no sudden changes in channel geometry or input data that can stability issues. An example of mapping the conveyance in GIS can be found here:

• Mapinfo thematically mapping of hydroprop check file
• QGIS (to be created)
• ArcMap (to be created)

The image below shows a hydroprop layer styled by the conveyance attribute.