Irrigation control

Irrigation can be modelled in different ways:

• either by a fix time-amount-schedule
• or by a process oriented, demand driven control.

The demand driven irrigation controls the irrigation amount dependent on the actual soil moisture. The parameters can be defined either per irrigation rule or even per crop type (depending on the choosen approach).
The irrigation water is taken from reservoirs (if present) or else from rivers or from the groundwater (uppermost layer). Coupled to the irrigation water handling the sustance and tracer module is balancing the tracer concentrations in any case.

Detailed descriptions of irrigation control can also be found in the model documentation.

Starting with WaSiM 8.5.0 irrigation control can also use the ETR/ETP-threshold method. When using this method, a crop specific ratio of actual to potential transpiration is used to trigger irrigation..

References