The environmental demand node can be modelled to fulfill floodplain requirements (as shown in Figure 1). The interaction between the river channel and the floodplain has been included by linking a controlled splitter node to the river channel to represent an effluent that leads to inundation of the floodplain. In this example, you can define the floodplain flow requirement explicitly of the required flow in the main river channel to force water down the effluent. The ordering system will determine the flow requirement in the main channel of the river to ensure that the floodplain requirement is met.
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. Environmental demand, Controlled splitter characteristics
