...
Parameter | Description | Units | Default | Typical Range |
Ts | Time constant governing the rate of recession of slow flow (Ts > Tq) | Time step | 10 | 1 - 100 |
Tq | Time constant governing the rate of recession of quick flow | Time step | 1 | 1 - 10 |
Vs | Proportion of slow flow to total flow | % | 50 | 0 - 100 |
| Soil Moisture Capacity | The difference in volumetric soil water content between field capacity and permanent wilting point | % | 0 | 10 - 30 |
Figure 1 Irrigator Demand Model interface
Additions
The relevant Functional Unit area should be equal to the maximum irrigated area plus any undeveloped area. The Undeveloped Area is then calculated internally by Source as the difference between the Functional Unit Area and the Maximum Irrigated Area.
The three routing parameters Ts, Tq and Vs in the Rainfall-Runoff table are only enabled if Enable Linear Storage Routing is toggled on.
Figure 2 Enable Linear Storage Routing
Exceptions
Soil moisture capacity is entered as a parameter in the Rainfall-Runoff Model table, and has been deactivated at the Irrigator Demand Model interface.
...