Agenda - Council - 10/27/2015 - Laserfiche WebLink

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Sand Filter: A technique for treating storm water, whereby the first flush of runoff is diverted into a self-contained bed of sand. The runoff is then strained through the sand, collected in underground pipes and returned back to the stream or channel Sediment Forebay: A storm water design feature that employs the use of a small settling basin to settle out incoming sediments before they are delivered to a storm water BMP. Often used full in tandem with infiltration devices, wet ponds or marshes. Sequencing: The process used by the Local Government Unit to evaluate the necessity of an activity relative to its impact on a wetland. The party proposing the impact must demonstrate that the activity proposed complies with the following principles in descending order of priority. 1. Avoids direct or indirect impacts to the wetlands that may diminish or destroy them; 2. Minimizes the impact to the wetland by limiting the degree or magnitude of the wetland activity and its implementation; 3. Rectifies the impacts by repairing, rehabilitating, or restoring the affected wetland; 4. Reduces or eliminates the impact to the wetland over time by preservation and maintenance operations; and, 5. Replaces unavoidable wetland impacts to the wetland by restoring or, if wetland restoration opportunities are not reasonably available, creating substitute wetland areas having equal or greater public value as provided for under the Wetland Conservation Act. Shoreland: Land located within the following distances from public waters: 1. One thousand feet from the ordinary high water level of a lake, pond, or flowage 2. Three hundred feet from a river or stream, or the landward extent of a floodplain designated by ordinance on a river or stream, whichever is greater. The limits of shoreland may be reduced whenever the waters involved are bounded by topographic divides which extend landward from the waters for lesser distances and when approved by the Commissioner of the DNR. Short Circuiting: The passage of runoff through a BMP in less than the theoretical or design treatment time. For example, a properly designed treatment pond will have the inlet and outlet pipes located as far apart (along the water flow path) as possible. A short circuiting pond would have the inlet very close to the outlet and the water coming into the pond would leave the pond much sooner than if it were able to travel through the entire pond. Storm Water Treatment: The use of accepted BMPs to treat runoff including detention, retention, filtering or infiltration of a given volume of storm water to remove pollutants. Stream Buffer: A variable width strip of vegetated land adjacent to a stream that is preserved from a disturbance and/or mowing to protect water quality and aquatic and terrestrial habitats. See also buffer strip. Section XI October 21, 2015 Page 81