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Policies,Practices,Programs,Regulations and Activities Document Effectiveness Rationale for <br /> (Existing and potential) Reference for Mitigation Effectiveness <br /> (Include page (High/Medium <br /> numbers or /Low/Not <br /> Other Source) Effective) <br /> Notes:gaps; <br /> shortfalls, <br /> conflicts,or <br /> 0 ortunities <br /> (2) The retention is not substantially <br /> different in location or degree <br /> than that experienced by the <br /> development site in its pre- <br /> development stage,unless such <br /> retention presents a danger to <br /> health or safety. <br /> (b) No surface water may be channeled or <br /> directed into the OWASA sanitary sewer system. <br /> (c) Whenever practicable,the drainage <br /> system of a development shall coordinate with the <br /> drainage system or drainage ways on surrounding <br /> properties or streets. <br /> (d) Use of drainage swales rather than curb <br /> and gutter and storm sewers in subdivisions is provided <br /> for in Section 15-216. Private roads and access ways <br /> within unsubdivided developments shall utilize curb <br /> and gutter and storm drains to provide adequate <br /> drainage if the grade of such roads or access ways is <br /> too steep to provide drainage in another manner or if <br /> other sufficient reasons exist to require such <br /> construction. <br /> (e) The minimum design storm frequency <br /> for all drainage systems shall be the 10 year storm, <br /> except that those facilities crossing streets shall be <br /> designed for the 25 year storm. <br /> (� Drainage culverts and associated <br /> facilities sha11 be suitably sized to accommodate <br /> designated storm frequencies and shall be suitably <br /> constructed and installed to insure that the facilities will <br /> function adequately and will not deteriorate within an <br /> unreasonabl short eriod of time. (AMENDED <br /> 98 <br />