01-24-2000 Council Work Session - Laserfiche WebLink

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I I I r r r r t 5. 6. 7. 8 10. 11. The pollution assimilative capacity for each specific marsh with totals when necessary. The maximum residential density pollution potential for each specific drainage area with totals when necessary. The percentage of the marsh needed to assimilate the projected pollution in its drainage area. The acreage, if any, with the potential for development of duck ponds, within a marsh (located in permanent standing water and computed from the water quality data). The acre feet of storage available within the marsh. The acre feet of storage required to prevent the flood level from rising more than 1/2 foot. The percentage of each marsh needed to control flooding from a 24-hour, 100-year storm. The statistical result of this study was the realization that a natural storm water drainage and filtration system was economically practical for Orono. but that excessive urbanization would outstrip the natural capacity of most of the wetlands leading to flooding potential and to increasing levels of nutrient pollution in Lake Minnetonka. Three of the twelve study recommendations are most significant in terms of the effect on this the 1980 CMP: 1. 2. 3. Every available means should be utilized to preserve the natural w'ater storage and treatment system, which is one of Orono’s best assets. The City of Orono should protect land adjacent to marshes which require more than their total existing areas to control storm water runoff and preserve the water quality. The City of Orono should acquire supplementary land which is needed to preser\ e the integrity of the natural system of pollution treatment and runoff control. Orono took these recommendations to heart in its planninu durinu the mid-1970's, via adoption of more stringent develoment standards that allowed for the preservation of wetlands and required large minimum lot sizes to avoid the detrimental effects of urbanization CMP 3A - 20 I