Each river authority may prepare regional plans for water quality management, control, and abatement of pollution in any segment of its river basin and adjoining coastal basins which:
(1) are consistent with any applicable water quality standards established under current law within the river basin;
(2) recommend disposal systems which will provide the most effective and economical means of collection, storage, treatment, and purification of waste, and means to encourage rural, municipal, and industrial use of the works and systems; and
(3) recommend maintenance and improvement of water quality standards within the river basin and methods of adequately financing the facilities necessary to implement the plan.