(a) Watersheds or subwatersheds approved as designated watersheds or subwatersheds by the Department shall have the regulatory requirements clearly specified through a watershed approach to nonpoint pollution control or flood control. The watershed approach shall result in a specific plan, developed or approved by the Department, for the designated watershed or subwatershed that contains the following information:
(1) Stormwater quantity or quality problem identification;
(2) The overall needs of the watershed, not just the additional impacts of new development activities;
(3) Alternative approaches to address the existing and future problems;
(4) A defined approach which includes the overall costs and benefits;
(5) A schedule for implementation;
(6) Funding sources and amounts; and
(7) A public hearing process prior to departmental approval.
(b) Upon approval of the designated watershed or subwatershed plan, all projects undertaken in that watershed or subwatershed shall have stormwater requirements placed upon them that are consistent with the designated watershed or subwatershed plan.