The County Executive shall submit for approval by resolution of the County Council, a plan for the control of water quantity, the restoration and maintenance of water quality, and protection of aquatic living resources of each major watershed in the County. The County Executive also shall provide for the periodic updating of the plans, projects or studies. Such plans, projects and studies shall be known as the major watershed management plans. If a major watershed management plan is amended by the County Council, the County Executive shall be given an opportunity to provide comments on such amendments for the County Council's consideration before the major watershed management plan becomes final. Each watershed plan shall contain stormwater management policies and recommendations for the implementation of these policies and shall be approved by the Administration. Where the watershed is located within the Chesapeake Bay Critical Area Overlay Zone, the watershed plan shall comply with the requirements of Subtitle 5B. A watershed management plan developed for the purpose of implementing different stormwater management policies for waivers and redevelopment shall: Include detailed hydrologic and hydraulic analyses to determine hydrograph timing; Evaluate both quantity and quality management and opportunities for ESD implementation; Include a cumulative impact assessment of current and proposed watershed development; Identify existing flooding and receiving stream channel conditions; Be conducted at a reasonable scale; Specify where on-site or off-site quantitative and qualitative stormwater management practices are to be implemented; Be consistent with the General Performance Standards for Stormwater Management in Maryland as found in the Maryland Design Manual and the Prince George's County Design Manual; and Be approved by the Administration.