Irrigator operates on a daily basis generating demands and extracting water to meet these demands via the water user and supply nodes. Irrigator maintains a daily water balance for each cropping area during its planting season, to calculate the daily soil water deficit and an irrigation requirement. The irrigation requirements are used by the Water User to generate orders and opportunistic requests and to subsequently place orders and requests and to extract water from a water source.The model can be applied in both regulated and unregulated systems.
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Figure 5 - Irrigation demand model (Crop Economics)
Runoff
The supply escape efficiency defines the amount of applied irrigation water that becomes runoff. A value of 0 results in no irrigation runoff; 10% indicates that 10% of the applied irrigation water becomes runoff. You must also specify a return efficiency, which means that the proportion of runoff that is returned to the water user can be stored in the farm storage or returned to the river. By default, both are set to 0 and do not need to be configured.
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This specifies the percentage of applied irrigation and rainfall that becomes deep percolation and drains below the rootzone. A 10% supply escape efficiency would indicate that 10% of the applied water becomes runoff. The return efficiency is not configurable for deep percolation.
Results of Irrigation demand
After configuring and running the scenario, you can view the results of the demand model. Figure shows the results how the water stress coefficient (Ks) varies over time. For soil water limiting conditions, Ks < 1. Where there is no soil water stress, Ks = 1.
The higher the value of Ks, the healthier the plant.
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| Note: A crop dies when Ks is less than 0.5%. |