(a) For outdoor uses.      
        (1) For users with less than five years of water use data, the beneficial reuse credit is calculated as 80% of the lowest total monthly volume of water used.       
        (2) For users with five or more years of water use data, the beneficial reuse credit is calculated as 80% of the average of the three lowest total monthly volumes of water use data submitted for the five years prior to the date the application is submitted. All users must have at least five consecutive years of data when taking the average of the lowest three months.       
      (b) For indoor uses.      
        (1) For users with less than five years of water use data, the beneficial reuse credit is calculated as 100% of the lowest total monthly volume of water used.       
        (2) For users with five or more years of water use data, the beneficial reuse credit is calculated as 100% of the average of the lowest three total monthly volumes of water use data submitted for the five years prior to the date the application is submitted. All users must have at least five consecutive years of data when taking the average of the lowest three months.       
      (c) When calculating the hydraulic application rate as described in §309.20(b)(3)(A) of this title (relating to Land Application of Sewage Effluent) or §222.83 of this title (relating to Hydraulic Application Rate) for subsurface area drip dispersal systems, the permitted flow may be reduced by the beneficial reuse credit.     
      (d) The size of the land application site area may not be reduced by more than 50% of the size required when calculating the hydraulic application rate using the permitted flow without the beneficial reuse credit.     
      (e) When calculating the required effluent storage as described in §309.20(b)(3)(B) of this title or §222.127 of this title (relating to Storage), the permitted flow may not be reduced by the beneficial reuse credit.     
      (f) For the purpose of recalculating the beneficial reuse credit and for renewing a permit, the executive director may accept water use data from users with less than two years of data on a case-by-case basis.     
     Source Note:        The provisions of this §309.24 adopted to be effective January 9, 2020, 45 TexReg 370