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Objects and Methods : Water User : User Methods : Irrigation Acreage and Evapotranspiration Rates
Irrigation Acreage and Evapotranspiration Rates
This category is only available when the Irrigation Requests or Irrigation Requests with Soil Moisture user method is selected in the Diversion and Depletion Request category. The category provides methods that compute Irrigated Area and Evapotranspiration Rate slots.
* Input Acreage and Rates
This is the default method. If this method is selected, Irrigated Area and Evapotranspiration Rate slots are optional inputs but required if Depletion Requested is not input.
* Aggregate Acreage and Rates
This method calculates and sets the Irrigated Area and an area-weighted Evapotranspiration Rate for use by the Irrigation Requests user method in the Diversion and Depletion Request user category.
Slots Specific to This Method
 Irrigated Area by Crop
Type: AggSeries Slot
Units: Area
Description: Irrigated area of each crop
Information: Each user-specified column represents a different irrigated crop acreage. These columns correspond to the crop evapotranspiration rates specified in the Evapotranspiration Rate by Crop AggSeries slot. The column labels can be changed to represent the given crop.
I/O: Input only
 Evapotranspiration Rate by Crop
Type: AggSeries Slot
Units: Velocity
Description: Evapotranspiration rate of each crop
Information: Each user-specified column represents a different irrigated crop evapotranspiration rate as volume per area per time. These columns correspond to the crops specified in the Irrigated Area by Crop AggSeries slot. The column labels can be changed to represent the given crop.
I/O: Input only
Method Details  
The method calculates and sets the Irrigated Area and an area-weighted Evapotranspiration Rate in the Irrigation Requests user method in the Diversion and Depletion Request user category on the Water User object. Solution logic for the Aggregate Acreage and Rates method proceeds as follows:
Given the Crop-specific Irrigation Area and the Crop-specific Evapotranspiration Rate slots with columns 0 to n, compute the following:
    
If Irrigated Area is 0, meaning no irrigation is occurring, compute the following:
    
Otherwise:
    
Revised: 01/05/2024