E. Indebtedness contracted on or after January first, nineteen hundred sixty-two and prior to January first, two thousand twenty-four, for the construction or reconstruction of facilities for the conveyance, treatment and disposal of sewage. The legislature shall prescribe the method by which and the terms and conditions under which the amount of any such indebtedness to be excluded shall be determined, and no such indebtedness shall be excluded except in accordance with such determination.