Laserfiche WebLink
iii. Wet Sedimentation Basin <br /> 1) Permanent volume of 1,800 cubic feet of storage below the outlet pipe for each acre <br /> that drains to the basin; <br /> 2) Permanent volume must reach a minimum depth of at least three(3) feet and must have <br /> no depth greater than 10 feet; <br /> 3) Must be configured to minimize scour or resuspension of solids; <br /> 4) In addition to the permanent volume the basin must provide the water quality volume <br /> as live storage. Water Quality volume is described in Section b iii b iv and b v• <br /> 5) Water Quality volume discharges at no more than 5.66 cubic feet per second (cfs)per <br /> acre of surface area of the basin; <br /> 6) Designed to prevent short-circuiting and the discharge of floating debris; <br /> 7) Basin outlets must have energy dissipation; <br /> 8)Must include a stabilized emergency overflow to accommodate storm events in excess <br /> of the basin's hydraulic design; <br /> 9) Must have a maintenance access typicallyeight ight(8) feet wide for the basin; <br /> 10) Must be located outside of surface waters and any buffer zones identified in <br /> Construction Stormwater General permit. <br /> 11) Permittees must design basins using an impermeable liner if located within active <br /> karst terrain. <br /> iv. Regional Wet Sedimentation Basins <br /> 1) When the entire water quality volume cannot be treated by volume reduction practices <br /> onsite, regional wet sedimentation basins can be used or created,_provided they are <br /> constructed basins, not a natural wetland or water body. <br /> 2)The regional basin conforms to all requirements for a wet sedimentation basin as <br /> described in Part d.iii. (Wet Sedimentation Basin) <br /> 3) Must be large enough to account for the entire area that drains to the basin <br /> 4) Waterways between the project and the regional basin must not be significantly <br /> degraded. <br /> 5)Written authorization from the City of Arden Hills or private entity that owns and <br /> maintains the regional basin. <br /> SECTION 2. This Ordinance shall become effective immediately upon its passage and <br /> publication according to law. A Summary of this Ordinance will be published in accordance with <br /> state statute. <br /> Page 6 of 7 <br />