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';f(� ` �� . �� � �� j .: . . �l� :J. •'.'J .. i <br /> t �b � <br /> , l ' �� µI '.� f . . I I <br /> � � 1 � I <br /> f1.r � �� � � � � � .�. � . � n. ';. �r . <br /> ' , / .. � , S � � '.,,1 i <br /> 11' ) � �} � �� ���41 �'i1 '� ��� . �f1i � .�i , <br /> t � <br /> 11 � } ; ,,. �. � ,.��4 <br /> ' 1 <br /> 4�i� eb �' 1'tfi �t .'.'I . 'y'n �'� 1n'' . <br /> .. . ,..wk. -. , t�!':� . . _ . . Il' , . � _ _,�._ <br /> 1 (c) ReYention/detention facilities must be provided in order <br /> to maintain surface water discharge rates at or below the <br /> 2 existing design storm peal< discharge as specified in the <br /> Comprehensive Drainage Plan; and <br /> 3 <br /> 4 (d) �Vhere open channe! construction is used to handle drainage <br /> within the subject property, a minimum of fifteen US) feet <br /> 5 will be provided between any structures and the top of the bank <br /> of the defined channel. <br /> 6 <br /> � (1) In open channel wori< the water s�rface elevation will <br /> $ be indicated on the plan and p�ofile drawings. The configuration <br /> of the finished grades constituting the bani<s of the open <br /> 9 channel will also be shown on the drawings. <br /> 10 (2) Proposed cross section of the channel will be shown <br /> 11 with stable side slopes as approved by the City Engineer. <br /> 12 (3) The water surface elevation of tiie maximum flow <br /> for the design storm will be indicated on the cross section. <br /> ]3 <br /> 14 (2) To the extent possible as determined by the City C-ngineer, , <br /> 15 approved measures for controlling runoff during construction should comply <br /> 16 with the above provisions. <br /> 17 (3) Adequat� measures as outlined and/or referred to in the Procedure <br /> 1S Manual shall be tal<en for controlling erosion during and afYer construction. <br /> 1� (4) Variances irom the requirements of Section 5(1) may be permitted <br /> 20 only after evaluation by the City Engineer of data supptied by the developer <br /> 21 and a determination usir.g the comprehensive drainage plai;s, and by employing <br /> 22 the following criteria: <br /> 23 (a) Sufficient capacity under design conditions of <br /> downstream facilities; <br /> 24 <br /> 25 (b) Maintenance of the integrity of the receiving waters; <br /> . 26 (c) Possibility of adverse effects of retention/detention; <br /> � 27 (d) Utility of regional retention/detention facilities; <br /> � 28 (e) Capability of maintenance of the system; and <br /> 29 (f) Structural integrity of abutting foundations and <br /> structures. <br /> 30 <br /> , 31 Requests for variar.ces shall be filed in writing with the City Engineer <br /> 3z and shall adequately detail the basis for granting an exemption. <br /> ' 7_ <br />