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Rating curve
Rating curves (Figure 3) are used to describe the physical characteristics of the reach and convert a flow into a level, ie. they produce an output of level. They can be specified in one of two ways:
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- Right click Rating Curve and choose Add Rating Curve;
- Today’s date will automatically be entered for Start Date. To change this, click the calendar on the right side (see Working with date-pickers);
- Enter the water level, discharge rate, reach width and dead storage; and
- Enter an appropriate value for Overbank Flow Level.
Figure 3. Storage routing link, Rating curve
You can also use the Import button to import a rating curve from a .CSV file the format of which is shown in Table 3.
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Note: In the Flow vs Loss/Gain table, flow cannot be negative. Additionally, the values for Loss/Gain Qloss must be increasing (as shown in Figure 34).
Figure
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4. Storage routing, Loss/Gain
Link Evaporation
Choose Evaporation to specify the rate of evaporation per unit of surface area (Figure 5). Typically, this is done using a time series (loaded using Data Sources), the format of which is shown in Table 4. You can also specify the rate of evaporation as a single value, or as an expression using the Function Editor.
Figure 5. Storage routing, Evaporation
Table 4. Storage routing link, Evaporation (data file format)
| Row | Column (comma-separated) | |
|---|---|---|
| 1 | 2 | |
| 1..n | time | value |
where:
time is the time of obersvation in "dd/mm/yyyy hh:mm:ss" format
value is the evaporation rate in millimetres per time-step
| Info | ||
|---|---|---|
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| Note: The file format shown in Table 4, as well as the screen shown in Figure 5 can be replicated for Rainfall and Timeseries Flux. The former allows you to specify the rate of precipitation; the latter allows the input of a time series of total water lost or gained on a link. Values can be positive or negative. A negative value denotes water returned to the link (a gain). See also Link losses and gains. |