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The basic approach to determining the water order is to consider the collection of flow rules and determine how much water is required for a given day to meet these rules. As water is not consumed by the EDM, the water order is simply the difference between the calculated water required and the forecast flow at the extraction point on the future delivery day.The EDM allows two forecasting periods, a short term and a medium term. This approach is to reflect real world water management decision making, whereby, depending on the size of the catchment, river operators can generally make a very accurate prediction of the likely flow for the next few days to weeks. After that time the prediction is less accurate. The EDM allows you to define the ‘look ahead’ period, which is the period that can be accurately forecasted. You can use the Expression Editor to define the method of forecasting. The recommended methods for determining the forecast period are to refer to an upstream node with a known travel time.
In Source, the environmental demand node is used to model environmental demand, which can be set up in two ways:
- As an in-stream requirement (In-stream requirement); or
- To act as a floodplain ().
Further detail about the node's configuration is described in their respective links shown above.