Section 680.5 - Watershed storm water plans and contents(a) Within two years following the promulgation of guidelines by the department pursuant to section 14, each county shall prepare and adopt a watershed storm water management plan for each watershed located in the county as designated by the department, in consultation with the municipalities located within each watershed, and shall periodically review and revise such plan at least every five years. The department may, for good cause shown, grant an extension of time to any county for the preparation and adoption of a watershed storm water management plan.(b) Each watershed storm water plan shall include, but is not limited to: (1) a survey of existing runoff characteristics in small as well as large storms, including the impact of soils, slopes, vegetation and existing development;(2) a survey of existing significant obstructions and their capacities;(3) an assessment of projected and alternative land development patterns in the watershed, and the potential impact of runoff quantity, velocity and quality;(4) an analysis of present and projected development in flood hazard areas, and its sensitivity to damages from future flooding or increased runoff;(5) a survey of existing drainage problems and proposed solutions;(6) a review of existing and proposed storm water collection systems and their impacts;(7) an assessment of alternative runoff control techniques and their efficiency in the particular watershed;(8) an identification of existing and proposed State, Federal and local flood control projects located in the watershed and their design capacities;(9) a designation of those areas to be served by storm water collection and control facilities within a ten-year period, an estimate of the design capacity and costs of such facilities, a schedule and proposed methods of financing the development, construction and operation of such facilities, and an identification of the existing or proposed institutional arrangements to implement and operate the facilities;(10) an identification of flood plains within the watershed;(11) criteria and standards for the control of storm water runoff from existing and new development which are necessary to minimize dangers to property and life and carry out the purposes of this act;(12) priorities for implementation of action within each plan; and(13) provisions for periodically reviewing, revising and updating the plan.(c) Each watershed storm water plan shall:(1) contain such provisions as are reasonably necessary to manage storm water such that development or activities in each municipality within the watershed do not adversely affect health, safety and property in other municipalities within the watershed and in basins to which the watershed is tributary; and(2) consider and be consistent with other existing municipal, county, regional and State environmental and land use plans.1978, Oct. 4, P.L. 864, No. 167, § 5, imd. effective.