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� <br />� <br />� <br />O <br />� <br />LI <br />� <br />� <br />� <br />� <br />� <br />� <br />�� <br />�, <br />� <br />� <br />DRAD7IAGE <br />The storm sewers necessary to intercept storm urater runoff within the developcnent area of <br />County Raad "'B-2", the Aliied Stores areg and,in a greater sense, the total drainage district <br />of w�hich each is a part, are dealt with sep��rately in this section of the report for the <br />purpose of clarity. <br />This separation should� not be misconstrued as permitting a choice of <br />constructing one syste�n and not the nther but is intended to present the rotal need. <br />Within this total subject of drainage and the s�torm sewers necessary therefor the subject will <br />be dealt with, in four segments, in order to adequately represent each separate probl�m and <br />the cost thereof. These four segments are as follows: <br />1. County Road "B-2" Storm Sewers from F�i�rview Auenue to Trunk Highway �51 <br />2. County Road "B-2" Storm Sewers from Trunk iiighway �S1 to Hamline l�ivenue <br />3. Frontage Road Storm Sewers fram Trunk Highway �51 to Hamline Avenue <br />4. District bW Trunk Storm Sewer <br />Qnder Item ).10. 4 above, reference is made to District 6W. This number refers to the district <br />numbea� a� designa.ted in the Master Plan for Storm Sewers for Roseville, Minnesota, prepared by <br />the �a��.ster Engineering Comp�ny and presented to the Village Council i3ecember 18, i962. <br />Dra-wing No. 6 included in this report, i•. an excerpt from the Storm Sewer Master Plan and <br />reflects the boundaries of District 6W and abutting districts. <br />Design Criteria• <br />The design criteria for storm sewers cove�ed by this report is th� same as that used in the <br />Ma.ster P1an. This plan uses a five year average frequency storm of 1.75 inches per hour. <br />The R�ational Method of Design was used. This method takes into account the type of surface <br />being tdrained a�ad the time of concentration of the rainfall bnth i� ove�land surface �low as <br />w+e11 as in the storm sewer. All design computations have been made a part of this report an�i <br />�aay 3� found in fihe Appendix. <br />Stort� Sewer Reyuirements for County Raad "B-2" Fairview Avenue to Trun�c Highwav �51: <br />'Drawin� No. 7 indicates the locatian and sizes of storm sewer required to drain County Raad <br />'�g-2��:ro�a�ys. Requirements include a 30 inch diameter pipe to intercept storffi water drainage <br />-lz- <br />