The ordinance shall generally describe the route or line, size, capacity and extent of the proposed outlet sewer, sewers, or drains and appurtenances, to be jointly constructed by the contracting municipalities, and of the main or trunk sewers or drains, if any, to be connected therewith, and the size, capacity and extent of the sewer collection basins, sewage disposal or treatment works, plants and stations, if any, proposed to be constructed in connection with such outlet or trunk sewers or drains, and shall also prescribe and fix the percentage of the capacity of such public improvement or works to the use of which each municipality shall be entitled, also the percentage of the total cost, damages and expense thereof to be paid by each contracting municipality.