A. Stormwater conveyance mechanisms must be sized to convey runoff from a 50-year storm event without causing flooding or other damage to public or private property, the stormwater management system, or other improvements.
B. Culvert size within public rights of way shall be determined by the public highway agency with jurisdiction. All other culvert sizing shall be done by an appropriate design professional.
C. Stormwater systems shall provide for sufficient storage volume and detention time to result in no increase in the peak rate of runoff from the site for a 25-year storm. Runoff from impervious and pervious surfaces shall be considered in meeting this requirement.
D. Where treatment of stormwater runoff is required prior to infiltration over the Rathdrum Prairie Aquifer, the runoff shall be conveyed to treatment areas with limited infiltration prior to treatment. (Ord. 493, 6-9-2016)