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<br />. <br /> <br />. <br /> <br />. <br /> <br />774-6021 MAIER STEWART ASSOC. <br /> <br />124 P05 <br /> <br />APR 21'93 15:12 <br /> <br />Honorable Mayor and City Council <br />February 23, 1993 <br />Page Two <br /> <br />1. Authoonr <br /> <br />The City of Elk River, by City Council motion at their December 21, 1992 meeting, <br />directed Maier Stewart & Associates, InC., to begin development of a Storm D~age <br />Master Plan by recommending various policy alternatives for the City to consider. <br /> <br />2. Scope <br /> <br />This stage of the Stann Water Master Plan proposes methods of dealing with both <br />quantity and quality of run-off for both residential and commercial development. In <br />developing the recommendations herein, existing policies for various metropolitan area <br />communities and watershed districts were utilized, including Valley Branch and Rice <br />Creek Watershed Districts and the cities of Roseville, Mahtomedi, and Centerville. <br /> <br />Also, included as an Appendix, is a model ordinance issued by the Metropolitan Council <br />to assist local governments in the seven county Metropolitan Area. in implementing a <br />policy to reduce nonpoint source pollution. Although Elk River is outside of the <br />Metropolitan Council'sjurlsdiction, following the Metropolitan Council's policies would <br />be prudent from a long-range planning stand point. <br /> <br />WATER QUANTITY <br /> <br />The following policy recommendations regarding water quantity will address natural surface <br />and groundwater storage and retention systems, as well as flooding concerns. <br /> <br />1. Establish tOO-year flood levels based on critical stann events. <br /> <br />2. Prohibit encroachment that will reduce the capacity of floodways and allow only <br />structures in the flood fringe that have been flood-proofed or that will not receive <br />extensive damage. The Floodplain Management Ordinance addresses this policy. <br /> <br />3. Preserve the retention Qpacities of the present drainage systems. <br /> <br />4. Discourage any alteration of wetlands. Allow alteration only if it can be accomplished <br />within the regulations of state and federal agencies. <br /> <br />5. Regional detention areas, as opposed to individual on-site detention, shall be used to <br />reduce flooding and to control discharge rates. <br /> <br />6. Major stormwater facilities (e.g., regional detention pond) shall be designed for the 100- <br />year storm. <br />