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` <br /> � 1 (c) Retention/detention facilities must bc provided in order <br /> to maintain surface water discharge rates at or below the <br /> 2 ex�sting design storm peak discharge as specified in the <br /> Comprehensive Drainage Pla�; and <br /> 3 <br /> q (d) \Vhere open channel construction is used to handle drainage <br /> within the subject property, a minimum of fiftcen (15) ieet <br /> 5 will be provided between any structures and thc top of the bank <br /> of the defined channel. <br /> G <br /> 7 (1) In open channel work the water surface elevation will <br /> be indicated on the plan and profile drawings. The config�ration <br /> 8 of the finished grades constituting thc banks of the open <br /> channel will also be shown on the drawings. <br /> 9 . I10 (2) Proposed cross section of the channel will be shown <br /> with stable side slopes as approved by the City Engineer. <br /> 11 <br /> 12 for the designrstorma willlbe ln�di at d on the�c oss section. <br /> 13 <br /> 14 (2) To the extent possible as determined by thc City Enginecr, <br /> 15 aPproved measures for controlling runoff during cons::uction sliould comply <br /> 1G with the above provisions. <br /> 17 (3) Adequate measures as outlined and/or referred to in the Proceduro <br /> 18 �lanual shall be taken for controlling erosion during and after construction. <br /> 19 (4) Variances from the requirements of Section 5(1) may be permitted <br /> 2� only after evaluation by the City Engineer of data supplied by the developer <br /> 21 and a determination using the comprehensive drainage plans, and by employinU <br /> 22 the following criteria: <br /> 23 (a) Sufficient capacity i���der design conditions of <br /> downstream faciliti. �; <br /> 24 <br /> 2g (b) Maintenance of the integrity of the receiving �vaters; <br /> 26 (c) Possibility of adverse effects of cetention/detention; <br /> 2� (d) Utility of regional retention/detention facilitics; <br /> 23 (e) Capability of maintenance of the system; and <br /> 29 (f) Structuralintegrity of abutting foundations and <br /> structures. <br /> 30 <br /> 31 Requests for v:xiances shall be filed in writing with the City _ngincer <br /> 32 and shall adequately detail the basis for granting an exempti�;�. <br /> • II '�' <br />