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(2) Stonnwater management facilities and best management practices shall be <br />• designed and sitedto capture, to the maximum extent practicable, the runoff from <br />the entire land development project area and, in particular, areas of impervious <br />cover within the development project area. <br />(3) Hydrologic parameters shall reflect the ultimate buildout in the land development <br />project area and shall be used in all engineering calculations. <br />(4) Post -development runoff rate of flow shall be maintained, as nearly as <br />practicable, as the pre -development runoff characteristics, subject further to the <br />requirements of § 10-52. <br />(5) The number, type and siting of stormwater management facilities and best <br />management practices shall be designed so as to preserve natural channel <br />characteristics and natural groundwater recharge on a site, to the extent practical. <br />(6) The program authority may allow non-structural measures to satisfy, partially or <br />in whole, the requirements of this article, if such measures are identified in <br />accepted technical literature, are acceptable to the program authority based on its <br />exercise of sound professional judgment, and the program authority finds that the <br />measures achieve equivalent benefit for water quantity and/or quality protection <br />as would otherwise be provided by structural measures. Non-structural measures <br />include, but are not limited to, minimization of impervious surfaces, stream <br />buffer reforestation, providing additional stream buffer areas, wetland <br />restoration, waste reuse and recycling, and use of design features or techniques <br />that reduce the rate and volume of runoff. <br />Sec. 10-52. Control of peak rate and velocity of runoff. <br />(a) Each stormwater management/BMP plan shall require that land and receiving waterways <br />which are downstream from the development that is subject to the plan be protected from damage <br />from stormwater, as provided herein: <br />(1) <br />The ten (10) year post -development peak rate of runoff from the land <br />development shall not exceed the ten I0 -year pre -development peak rate of <br />runoff. <br />(2) <br />The two (2) year post -development peak rate and velocity of runoff from the land <br />development shall not exceed the 2 -year pre -development peak rate and velocity <br />of runoff. <br />(3) <br />If the land development is in a watershed for which a hydrologic or hydraulic <br />study has been conducted, or a stormwater model developed, the program <br />authority may modify the requirements of paragraphs (1) and/or (2), above, so <br />that stormwater runoff from the site of the land development is controlled in <br />accordance with the findings in the study or model, or to prevent adverse <br />watershed stormflow timing, channel degradation, or localized flooding <br />problems. <br />(4) <br />In addition to the requirements of paragraphs (1) and (2), above, the program <br />authority may require that the plan include additional measures to address <br />damaging conditions to downstream properties and receiving waterways caused <br />by the land development. In establishing such measures the program authority <br />. <br />may refer to state conservation standards, criteria or specifications, or standards, <br />-19- <br />