Rating Curve | Technical Reference

This unit specifies a rating curve at a given node. Its primary purpose is to allow water levels to be generated at Muskingum routing nodes.

Theory and Guidance

General

This unit specifies a rating curve at a given node. Its primary purpose is to allow water levels to be generated at Muskingum routing nodes.

This unit only gives information when required: it does not have any computation phase and can be placed anywhere in the data file. Basically, this unit is used when the flow is split at a rating junction, or when solving mixed reaches (those formed by combining hydrodynamic reaches solved by the full Saint Venant equations) and flood routing reaches.

Usage

To add a rating curve unit into your network, right-click on the network table and select 'insert' > 'rating curve', as shown below.

Only one node is attached to this unit.

Data

Field in Data Entry Form	Description	Name in Datafile
Node Label	label of node at which rating curve is defined	Label
n/a	number of q, h data pairs	n_dat
Flow	flow associated with water level h_i (m³/s)	q_i
Water Level	water level at flow q_i (mAD)	h_i

Datafile Format

General

Line 1 : keyword 'QRATING' [comment]

Line 2 : Label

Line 3 : n_dat

Line 4 to Line 3+n_dat : q_i, h_i

where n_dat is the number of data sets following, items in square brackets are optional, and other parameters are as defined in the data section.

Example

QRATING
UNIT056
         4
     0.000     0.000
     1.000     0.100
     2.000     0.200
     3.000     0.300