The Pride demand model (developed for Victorian farming districts) replicates water requirements for a cropped area using a combination of climate data, crop culture and knowledge of traditional farming practices. These irrigation requirements are used to generate orders within regulated river systems or to drive extractions from unregulated systems. It is governed by factors which determine crop water use - principally the irrigation culture, climate, the characteristics of the soil and the type of irrigation system. In Source, a Pride demand model is configured and managed in the water user node feature editor.
To create a new Pride model, right click on Demand Models and choose Add Pride. Figure 1 shows the parameters that must be configured.
Figure 1. Pride demand model, main screen
Channel Efficiencies
Figure 2. Pride demand mode, Channel Efficiencies
Limit Curve
This prevents a demand node from using all of its available allocation too early in the season. The Allocation Proportion can be set up as a constant or it can be customised using a function to vary according to the allocation percent set up in a Resource Assessment. Figure 3 shows an example of this.
Figure 3. Pride demand model, Limit curve
Evaporation
Figure 4. Pride demand model, Evaporation
Rainfall
Figure 5. Pride demand model, Rainfall
If an annual time series of crop areas is not used, you can specify a single set of crop areas, which applies to the entire model period. Ensure that the order and number of crops are consistent across all steps of model development. The model assumes that the first crop is Annual Pasture. If you do not wish to model Annual Pasture, then you must enter zero hectares of Annual Pasture as the first crop.
| Info | ||
|---|---|---|
| ||
| Note: If crop areas are small, your irrigation water requirements will be less and Source may round the demands to zero. |
Climate
You can specify multiple rainfall stations using the Update Rainfall Station Data button (opens Figure 1). To add a rainfall station, right click and choose Add from the contextual menu. You can also rename and delete a station using the contextual menu. Alternatively, use the Add and Delete buttons at the top left side. Load a time series using the right side panel.
Figure 1. Pride demand model, Rainfall Data)
Load a time-series file to specify Evaporation (Figure 2).
Figure 2. Pride demand model, Climate
Click on Update Rainfall Station Data to upload this information via Feature Editor 48.
Limit Curve
You can manually enter the available water and its associated limit (both in ML) or import it from a text file.
Return Flows
Refer to for more information. Note that the percentage of volume supplied can be greater than 100%. This indicates that there is more return flow from the irrigator than diversions due to rainfall runoff.