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Orange County SE & SC Ordinance S,.,..teal.e. r, �nnaSeptember 12, 2016 <br />4 x slope x 100 <br />where "slope" is expressed as a percentage derived by dividing by 100 the <br />rise in elevation between the high water line of the Lake and a point one <br />hundred feet from that point along the above described perpendicular line. <br />The existing natural vegetation in the designated buffer areas shall not be <br />disturbed in any way that would reduce the area's effectiveness in <br />achieving the objectives set forth in this subsection. In addition, buffer <br />areas from which the vegetative cover has been removed shall be planted <br />or. otherwise provided with ground cover devices or structures sufficient to <br />allow the buffer area to accomplish the objectives set forth in this <br />subsection. Buffers shall not be used as temporary erosion control devices <br />during construction. <br />Sediment Storage - sediment shall be retained on the site of the development. <br />Detention or Retention Areas retention and detention ponds may be used to retain and <br />detain the increased and accelerated runoff which the development generates. Water shall <br />be released from detention ponds into watercourses or wetlands at a rate and in a manner <br />approximating the natural flow which would have occurred before development. <br />Retention and detention ponds shall be designed so that they maintain their structural <br />integrity when subject to a 100 -year storm. Detention and retention areas shall be <br />designed so that shorelines are sinuous rather than straight and so that the length of the <br />shoreline is maximized, thus offering more space for the growth of littoral vegetation. The <br />banks of detention and retention areas shall slope at a gentle grade into the water as a <br />safeguard against drowning, personal injury or other accidents, to encourage the growth of <br />vegetation and to allow the alternate flooding and exposure of the areas along the <br />shoreline as water levels periodically rise and fall. <br />Open Space - the use of drainage facilities and vegetated buffer zones as open space, <br />recreation, and conservation areas shall be encouraged. <br />Recreational activities undertaken in these open space areas shall be limited to passive or <br />leisure activities. <br />Grassed Swales - drainage within the development shall be accommodated by the natural <br />drainage systems whenever possible. The use of grassed drainageways to channel water <br />shall be encouraged. The velocity of travel in this grassed swale shall range between 2 -4 <br />feet/second. <br />Retention of Runoff from Industrial Sites - On -sites developed for industrial purposes <br />(i.e., uses involving the manufacturing, processing, creating, repairing, renovating, <br />painting, cleaning, or assembly of goods, merchandise, or equipment), retention or <br />detention areas meeting the standards set forth in subsection j. shall be used to insure that <br />18 <br />