ORD-2007-017 - Sedimentation and Erosion Control Ordinance

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Orange County SE & SC Ordinance Septetnb^~ ",'^^'Septetnber 12, 20h6 4 x slope x 100 where "slope" is expressed as a percentage derived by dividing by 100 the rise in elevation between the high water line of the Lake and a point one hundred feet from that point along the above described perpendicular line. The existing natural vegetation in the designated buffer areas shall not be disturbed in any way that would reduce the area's effectiveness in achieving the objectives set forth in this subsection. In addition, buffer areas from which the vegetative cover has been removed shall be planted or otherwise provided with ground cover devices or structures sufficient to allow the buffer area to accomplish the objectives set forth in this subsection. Buffers shall not be used as temporary erosion control devices during construction. Sediment Storage -sediment shall be retained on the site of the development Detention or Retention Areas -retention and detention ponds may be used to retain and detain the increased and accelerated runoff which the development generates. Water shall be released from detention ponds into watercourses or wetlands at a rate and in a manner approximating the natural flow which would have occurred before development. Retention and detention ponds shall be designed so that they maintain their structural integrity when subject to a 100-year storm. Detention and retention areas shall be designed so that shorelines are sinuous rather than straight and so that the length of the shoreline is maximized, thus offering more space for the growth of littoral vegetation. The banks of detention and retention areas shall slope at a gentle grade into the water as a safeguard against drowning, personal injury or other accidents, to encourage the growth of vegetation and to allow the alternate flooding and exposure of the areas along the shoreline as water levels periodically rise and fall. Open Space -the use of drainage facilities and vegetated buffer zones as open space, recreation, and conservation areas shall be encouraged. Recreational activities undertaken in these open space areas shall be limited to passive or leisure activities. Grassed Swales -drainage within the development shall be accommodated by the natural drainage systems whenever possible. The use of grassed drainageways to channel water shall be encouraged. The velocity of travel in this grassed swale shall range between 2-4 feetlsecond. Retention of Runoff from Industrial Sites - On sites developed for industrial purposes (i.e., uses involving the manufacturing, processing, creating, repairing, renovating, painting, cleaning, or assembly of goods, merchandise, or equipment), retention or detention areas meeting the standards set forth in subsection j. shall be used to insure that 18