I To address stormwater runoff from the proposed development, West Creek proposes <br />2 to transmit stormwater from the streets and individual lots in underground pipes that will <br />3 connect to the existing piped stormwater system in Martin Street located north of the subject <br />4 property. That existing system is piped until it eventually outfalls to the Amazon Canal in an <br />5 open drainage system some distance to the north of Martin Street. During the proceedings <br />6 below, West Creek tools the position that EC 9.8325(13) is satisfied by its agreement to <br />7 satisfy EC 9.6793, Stormwater Flow Control (Headwaters), which does not otherwise apply <br />8 to the proposed PUD because the open portion of the natural drainage course, the Amazon <br />9 Canal, is located below 500 feet in elevation. EC 9.6793(3)(a). See n 10. The planning <br />10 commission imposed a condition of approval that requires West Creek to include on the final <br />11 PUD plans and final subdivision plat a requirement that each lot in the subdivision must have <br />12 its own filtration stormwater system that meets EC 9.6793, and a condition that requires the <br />" (1) Purpose. The purpose of EC 9.6793 is to protect waterways in the headwaters area <br />from the erosive effects [sic] of increases in stormwater runoff peals flow rates and <br />volumes resulting from development. <br />"(3) Standards. <br />"(a) Applications shall demonstrate, using methodology in the Stormwater Management <br />Manual, that peals rates of flow delivered to an existing open waterway at a point <br />above 500 feet in elevation will not increase during storms larger than the water <br />quality design storm and smaller than the flood control design storm as a result of the <br />development that is the subject of the application; <br />"(b) For purposes of designing the system as required by the standards in this section, the <br />amount of impervious surface per lot is assumed to be the maximum lot coverage <br />allowed for the use in the zone in which it is located, unless the applicant <br />demonstrates otherwise. <br />"(c) All facilities to control the rate of stormwater runoff shall be sited, designed and <br />constructed according to the flow control provisions and the facility design <br />requirements set forth in die Stormwater Management Manual. Flow control <br />facilities must be designed using one of the methodologies outlined in the Stormwater <br />Management Manual. <br />"(d) The standards in EC 9.6793(3) may be adjusted pursuant to EC 9.8030(21)." <br />Page 17 <br />