The Salinity Flush Formula Editor is used to set up custom expressions for CROP_LEACHING_REQUIREMENT and CROP_SALINITY_APPLIED_WATER. It can be accessed from the Crop Leaching Requirement Pane or the Salinity of Applied Water Pane of the Farm Land Use Properties dialog box.
Only the functions and variables defined in MODFLOW-OWHM can be used with custom expressions.
For further information see the documentation of SALINITY_FLUSH_IRRIGATION in the MODFLOW-OWHM version 2 documentation.
Predefined Variables
•LR Leach requirement (-) ==> Set by CROP_LEACHING_REQUIREMENT
•ECw Electrical conductivity of irrigation water (dS/m)
•ECe Crop Electrical conductivity tolerance (dS/m)
•CU Potential consumptive use of crop (total potential consumption of water) (L3/T)
•ETr Reference EvapoTranspiration
•ETc Crop evapotranspiration from precipitation and irrigation (L3/T) --if irrigation is fully met
•ETp Crop evapotranspiration from precipitation (L3/T)
•ETi Crop evapotranspiration from irrigation (L3/T)
•CIR Crop irrigation requirement = ETi (water required to meet consumptive use - under perfect efficiency --EFF=1)(L3/T)
•DMD Crop irrigation demand (water required to meet consumptive use - includes efficiency of irrigation)(L3/T)
•P Precipitation that falls on crop (L3/T)
•AREA Crop area
•Tgw Transpiration from groundwater-root uptake
•Tp Transpiration from precipitation
•Ti Transpiration from irrigation
•EFF Irrigation efficiency
•ROOT Crop root depth
•CapF Capillary Fringe Depth/Length
•DP_p Deep percolation from precipitation
•DP_i Deep percolation from irrigation if irrigated demand is fully met (includes added demands, but not deep percolation from salinity irrigation).
•DP Total potential deep percolation from precipitation and irrigation
•ADRS Crop Added Demand Runoff Split (ADDED_DEMAND_RUNOFF_SPLIT)
•ADMD Sum of other Added Demands for the crop
