The environmental demand node can be modelled as part of a floodplain (as shown in Figure 1).
Figure 1. Environmental demand, floodplain
The controlled splitter must be configured as shown in Figure 2 to ensure that the environmental demand node receives all flow that was ordered. In the model shown in Figure 1, if Environmental Demand 3 orders 200ML, exactly this amount will travel down Default Link #5. Generally, when an environmental demand node forms part of a floodplain, it orders extra water to achieve flooding (for environmental water requirements).
Figure 2. Controlled splitter characteristics in environmental demand
