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<br />PROPOSED OPERATING PRINCIPLE #12 <br /> <br />STORM RUNOFF WATER QUALITY <br /> <br />THE CWCB ENCOURAGES DESIGN OF DRAINAGE <br />FACILITIES AND OTHER MEASURES THAT ENHANCE <br />THE QUALITY OF STORM RUNOFF. PLANNING AND <br />DESIGN OF DRAINAGE FACILITIES SHOULD BE <br />PREPARED TO MINIMIZE ADVERSE IMPACTS AND/OR <br />IMPROVE WATER QUALITY OF THE RESULTING STORM <br />RUNOFF DISCHARGES. DRAINAGE FACILITIES MAY BE <br />DESIGNED TO FUNCTION AS BOTH STORM RUNOFF <br />CONVEYANCE AND WATER QUALITY ENHANCEMENT <br />FACILITIES. THIS RECOMMENDATION IN NO WAY <br />SUPERSEDES REQUIREMENTS RELATED TO THE <br />EPA's NATIONAL POLLUTENT DISCHARGE <br />ELIMINATION SYSTEM (NPDES) OR OTHER WATER <br />QUALITY STANDARDS. <br />.. . . <br />