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Definitions � MCWD: Minnehaha Creek Watershed District Page 1 of 3
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<br /> Search MCWD Website Proper Erosion and Sediment Control
<br /> DEFINITIONS
<br /> MINNEHAHA CREEK WATERSHED DISTRICT BOARD OF MANAGERS
<br /> REVISIONS PURSUANT TO MINNESOTA STATUTES§103D.341
<br /> Adopted May 26,2011
<br /> Effective June 1,2011
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<br /> KEY DEFINITIONS AND ACRONYMS
<br /> • Abstraction means permanent retention of runoff on a site through structures and practices such as infiltration,evapotranspiration and capture and
<br /> reuse.See also the Abstraction Credit Schedule in Appendix A of the Stormwater Management Rule.
<br /> • Access Corridor means a corridor equal to 30 percent of the total shoreline length to a maximum of 30 feet.
<br /> • Agricultural activity means the use of land for the production of agronomic,horticultural or silvicultural crops,including nursery stock,sod,fruits,
<br /> vegetables,flowers,forages,cover crops,grains,and Christmas trees.Agricultural activity also includes grazing.
<br /> • Alteretion or alter means any activity that will change or diminish the course,current,or cross-section of public waters and wetlands.
<br /> • BMPs(best management practices)are actions taken to prevent or reduce detrimental impacts to the environment while maintaining the natural
<br /> characteristics of the environment.
<br /> • Beds of a waterbody means all portions of a waterbody located below the ordinary high-water level.
<br /> • Bioengineering Stabilization means the strategic installation of natural,vegetative,biologically active materials in conjunction with toe stabilization,
<br /> riprap or other hard-armoring materials to stabilize shoreline or streambank areas and associated slopes and prevent erosion.
<br /> • Biological Stabilization means the strategic placement of natural,vegetation,biologically active materials—such as but not limited to brush
<br /> mattresses,live stakes/piantings,brush layering,fiber rolls,root wads and willow wattles—to stabilize shoreline or streambank areas and prevent
<br /> erosion.
<br /> • Design Storm refers to a storm magnitude with a retum period(T)which has the probability(1/T)of being equaled or exceeded in any given year.For
<br /> example,a"100-year"event at a given location has a chance of 1/100 or 0.01 or 1%of being equaled or exceeded in any given year.For MCWD
<br /> regulatory purposes,the rainfall depths to be used are as follows:
<br /> � 1-year event=2.4"in 24 hours
<br /> � 10-year event=4.1"in 24 hours
<br /> � 100-year event=5.9"in 24 hours
<br /> All rainfall depths shall use the NRCS Type II rainfall distribution.
<br /> � • Development means any land-disturbing activity that creates impervious surface,with the exception of Linear Transportation Projects.
<br /> • Dredge means the removal of the sediment or other materials from the beds,banks or shores of,a waterbody by means of hydraulic suction,
<br /> mechanical excavation or any other means.
<br /> • Excavation means the displacement or removal of sediment or other material.
<br /> • Fast Track Permit means a permit issued by staff for standard rip rap,sandblankets or maintenance fill projects which are installed according to
<br /> technical specifications provided by District engineers,or an erosion control permit issued by staff in accordance with the criteria in the Erosion Control
<br /> Rule.
<br /> • Fill means any material piaced or intended to be placed on the bed or bank of any protected water or wetland.Fill must be ciean,inorganic material that
<br /> is free of pollutants
<br /> • Floodplain means the areas adjoining a watercourse or water basin which have been or hereafter may be covered by a 100-year regional flood.
<br /> http://www.minnehahacreek.org/permits/full-mcwd-rules/definitions 3/�/2013
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