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<br />protection measures and vegetative restoration as <br />quickly and thoroughly as possible; and, <br /> <br />(vii) A detailed drainage plan and street layout that <br />comply with the requirements of this chapter; and a <br />showing of compliance with the applicable <br />requirements of this chapter for control <br />strategies. <br /> <br />(viii) Special notes or attachments as may be required by <br />other sections of this chapter. <br /> <br />(ix) Restoration techniques employed after construction. <br /> <br />c. The plan shall adhere to the following standards <br />pertaining to overland flow and natural drainage: <br /> <br />(i) Natural drainage patterns shall be preserved <br />whenever possible. <br /> <br />(ii) The loss of the pervious character of the soil <br />shall be limited in order to prevent erosion and <br />attenuate the harm of contaminants collected and <br />transported by stormwater. <br /> <br />(iii) Open surface drainage through grass-lined swales <br />shall be utilized if possible. <br /> <br />(iv) The use of streets and street rights-of-way as the <br />central drainage network shall be avoided whenever <br />practical. <br /> <br />(v) Drainage swales and other areas used for conveying <br />stormwater runoff from developed areas shall be <br />located to avoid sinkholes, faults and fractures to <br />the greatest extent practicable. <br /> <br />(vi) Construction of enclosed storm sewers and <br />impervious channel linings shall be permitted only <br />when the Director of Public Works, or his <br />designated representative, on the basis of <br />competent engineering evidence, concludes that such <br />storm sewers or impervious linings are justifiable <br />options. <br /> <br />(vii) Necessary stormwater drainage systems and/or <br />culverts shall be designed to mitigate the impact <br />of erosion and stormwater runoff on water quality <br />through the use of approved control strategies to <br />control sediment and dissipate energy and through <br />the use of multiple smaller outlets whenever <br />practical and by locating discharges to maximize <br />overland flow. <br /> <br />6 <br />