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r <br /> z � <br /> (b) An average permanent pool depth of four to ten 10 feet; <br /> (c) A permanent pool length-to-width ration of 3:1 or greater; <br /> (d) A minimum protective.shelf extending ten feet into the permanent pool with a <br /> slope of 10:1,beyond which slopes should not exceed 3:1; <br /> (e) A protective buffer strip of vegetation surrounding the permanent pool at a <br /> minimum width of , <br /> 6.5 feet; <br /> __(f) All storm water detention facilities shall have a device to keep oil, grease, and <br /> other floatable material from moving downstream as a result of normal <br /> operations; <br /> (g) Storm water detention facilities for new development must be sufficient to limit <br /> peak flows in each subwatershed to those that existed before the development for <br /> the 10 year storm event. All calculations and hydrologic models/information used <br /> in determining peak flows shall be submitted along with the meter <br /> nimiagement plan; <br /> (h) All storm water detention facilities must have a forebay to remove coarse-grained <br /> particles prior to discharge into a watercourse or storage.basin. <br /> Subd. 9. Wetlands. <br /> (a) Runoff shall not discharged directly into wetlands without resettlement of the <br /> runoff. <br /> (b) Wetlands must not be drained or filled, wholly or partially,unless replaced by <br /> restoring or creating wetland areas of at least equal public value. Replacement <br /> must be guided by the following principles in descending order of priority: <br /> (1) Avoiding the director indirect impact of the activity that may destroy or <br /> diminish the wetland; <br /> (2) Minimizing the impact by limiting the degree or magnitude of the wetland <br /> activity and its implementation; <br /> (3) Rectifying the impact by repairing,rehabilitating, or restoring the affected <br /> wetland environment; <br /> -12- <br />