(Added by Ordinance No. 153288, effective May 26, 1982.) The Water Growth Impact Charge Trust Fund is hereby created. Revenues received by the City for growth impact charges from other water purveyors shall be placed in this Fund and expended only for duly authorized payments for expansion of the total water system capacity. Should this Fund become unnecessary, due to changes in the water sales contracts with other water purveyors, any remaining funds at that time shall be paid to the Water Fund.