AR = hydraulic application rate (inches per month)

ET = ETo x Kc , the actual water requirement of crop (inches per month)

ETo = potential evapotranspiration (inches per month)

Kc = crop coefficient (decimal) Kc ranges from 0.5 to 1.0

RAINe = RAIN x EF%, the effective rainfall (inches per month)

RAIN = total rainfall (inches per month)

EF% = effective rainfall percentage is the portion of rainfall/precipitation (inches) that infiltrates into the soil. An EF% of any value other than 0.67 must by justified by the applicant and approved by the executive director.

LEACH = leaching volume (inches per month). The leaching fraction may be determined using the electrical conductivity ( millimhos/cm at 25^o C) of the applied water and targeted soil salinity level (see §309.20(b)(3)(A) of this title (relating to Land Disposal of Sewage Effluent); or