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zo <br />I. Sediment Storage -sediment shall b~ retained on the site of the <br />development. <br />J. Detention or Retention Areas -retention and detention ponds may be <br />used to retain and detain the increased and accelerated runoff which the <br />development generates. Water shall be released firom detention ponds <br />into watercourses or wetlands at a rate and in a manner approximating the <br />natural flow which would have occurred before development. <br />Retention and detention ponds shall be designed so that they maintain <br />their structural integrity when subject to a 100-year storm. Detention and <br />retention areas shall be designed so that shorelines are sinuous rather. <br />than straight and sv that the length of the shoreline is maximized, thus <br />offering more space for the growth of littoral vegetation. The banks of <br />detention and retention areas shall slope at a gentle grade into the water <br />as a safeguard against drowning, personal injury or other accidents, to <br />encourage the growth of vegetation and to allow the alternate flooding and <br />exposure of the areas along the shoreline as water levels periodically rise <br />and fall. <br />K. open Space -the use of drainage facilities and vegetated buffer zones as <br />open space, recreation, and conservation areas shall be encouraged. <br />Recreational activities undertaken in these open space areas shall be <br />limited to passive or leisure activities. <br />L. Grassed 5wales -drainage within the development shall be <br />accommodated by the natural. drainage systems whenever passible. The <br />use of grassed drainageways to channel water shall be encouraged. The <br />velocity of travel in this grassed swale shall range between 2~ <br />feet/second. <br />M. Retention of RunofF from Industrial Sites - On sites developed for <br />industrial purposes (i.e., uses involving the manufacturing, processing, <br />creating, repairing, renovating, painting, cleaning, or assembly of goods, <br />merchandise, or equipment), retention ar detention areas meeting the <br />standards set forth in subsection j. shall be used to insure that runoff is <br />retained on the site before being released. The purpose of this <br />- requirement is to insure that, not only will the standard set forth in <br />subsection 9A. be met, but also a mechanism will be provided to <br />safeguard the watershed against the spillage of toxic or dangerous <br />substances. <br />