AG 1997 08 12 - Laserfiche WebLink

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by any other agency of this state or the United States or any generally recognized organization or association. Sediment basins within HQW zones shall be designed and constructed such that the basin will have settling efficiency of at least 70 percent for the 40 micron (0.04mm) size soil particle transported into the basin by the runoff of that 2- year storm which produces the maximum peak rate of runoff as calculated according to procedures in the United States Department of Agriculture Soil Conservation Service's National Engineering Field Manual for Conservation Practices or according to procedures adopted by any other agency of this state or the United States or any generally recognized organization or association. Newly constructed open channels in FIQW shall be designed and constructed with side slopes no steeper than 2 horizontal to 1 vertical if a vegetative cover is used for stabilization unless soil conditions permit a steeper slope or where the slopes are stabilized by using mechanical devices, structural devices or other acceptable ditch liners. In any event, the angle for side slopes shall be sufficient to restrain accelerated erosion. o Must be provided for any portion of land-disturbing activity in a FIQW zone within 15 working days or 60 calendar days following completion of construction or development, whichever period is shorter. Section 9 Storm Water Outlet Protection ao Persons shall conduct land-disturbing activity so that the post- construction velocity of the 10-year storm runoff in the receiving watercourse to the discharge point does not exceed the greater of: The velocity established by the table in Paragraph (d) of this Section; or o The velocity of the 10-year sto~-m runoff in the receiving watercourse prior to development. If conditions (1) or (2) of this Subsection cannot be met, then the receiving watercourse to and including the discharge point shall be designed and 11