The Agricultural Runoff rainfall-runoff model allows the user to implement the functionality of the Irrigator Demand Model as a rainfall-runoff model at the Functional Unit level. It is used to represent cropping areas in sub-catchments which are rain-fed and not part of a command area which receives water from a dam (regulated irrigation). Return flows are added to the sub-catchment outflow, not directly to the river. Also available is the option to add flow routing to return flows, to represent the function of routing parameters in standard rainfall-runoff models.
Functional unit area should be equal to the maximum irrigated area plus any undeveloped area