(a) An applicant for a project subject to this chapter shall calculate the estimated water use for each hydrozone using the following equation:
(1) ETWU = ETo x 0.62 x ETAF x Area
(2) The sum of all landscaped areas shall be the ETWU for the project.
(b) The abbreviations used in the equation have the following meanings:
(1) ETWU = Estimated total water use in gallons per year, or annual gallons required.
(2) ETo = Evapotranspiration in inches per year.
(3) 0.62 = Conversion factor to gallons per square foot.
(4) ETAF = Evapotranspiration Adjustment Factor = Plant Factor/Irrigation Efficiency.
(5) Area = Landscaped area in square feet.
(c) The ETWU for a proposed project shall not exceed the MAWA.