Create Rating Curves

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Create Rating Curves

Rating curves form an important part of many flood forecasting systems. There are two parts to creating ratings curves:

Extracting hydrographs (flow vs time) from the time-varying water surfaces

Building a rating curve

The tools are accessed on the Setup Panel, using the Rating Curves tool in the Flood Forecasting section.

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Extract Flow Hydrograph

This tool will extract flow hydrographs from multiple time-varying water surfaces. The cross sections along which to extract the hydrographs flow are defined as polylines in a GIS layer. A field in the GIS layer defines the ID for each cross section.

 

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When the tool is run, the hydrographs will be saved in separate CSV files with the following nomenclature:

XSectID-WaterSurfaceFileName.CSV

 

Build Rating Curve

Once hydrographs have been extracted, a rating curve can be manually created using this tool.

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1) clip11983 Load all relevant waterRIDE hydrograph files (*.csv), or TUFLOW PO Line Export Files (*.csv) for a location.

 

2) clip11984Enter drawing mode to draw the rating curve to match the raw data. Left clicking on the chart when in this model will add a point to the rating curve. The cursor will change to a cross.

 

3) clip11985 Enter zoom/pan mode to zoom in on the raw data. Left click at the top left of your desired zoom window and drag down and right to draw the zoom window. Right click and drag to pan the chart. Left click and drag to the upper left to reset back to the full chart extent.

 

4) clip11986Enter edit rating curve mode. Left click on a rating curve point and drag to its new position, or simply left click anywhere on the chart to move the nearest node to that point. The cursor will change to a hand.

 

5) clip11987 Save the current rating curve to a waterRIDE™ rating curve file (*.csv)

 

Rating Curve File Format

waterRIDE rating curves follow a simple CSV file format. An example is provided below:

 TITLE,Sample Rating Curve                for reference only, not used by system

 GAUGE,Cab_Test                        for reference only, not used by system

 Q,WL                                        header line for rating data

 0,500                                        start of rating curve data

 17.45,524.42

 33.18,524.7

 57.57,524.96

 ...