Notwithstanding the provisions of Section 71631, in any improvement district situated within the Otay Municipal Water District in San Diego County, the standby assessment or availability charge shall not exceed thirty dollars ($30) per acre per year for land on which the charge is levied or ten dollars ($10) per year for a parcel less than one acre. In any such improvement district the proceeds from any standby assessment or availability charge in excess of ten dollars ($10) per acre per year shall only be used for the purposes of such improvement district.
This section, applicable only to the Otay Municipal Water District of San Diego County is necessary because of the unique and special water management problems of the area included within such district.