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CC_Minutes_2016_0718
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7/29/2016 3:26:11 PM
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7/26/2016 10:10:05 AM
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Roseville City Council
Document Type
Council Minutes
Meeting Date
7/18/2016
Meeting Type
Regular
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APPENDIX A— Mar�inal Runoff Calculations. <br />Note, all engineering input was proved by the City of Roseville, 1 calculated depth, area, <br />volume, and percentage (simple math - not engineeringJ. Given my attachment to this proposal <br />and the preliminary nature of the calculations, I feel it would be unethical for me to certify these <br />calculations. 1 would ask that the City Professional Engineers perform their own professional <br />analysis. If this city wishes, I would be willing to hire an independent Professional Engineer to <br />provide certified calculations to the city. <br />The rainfall volume conforming to a 24hour/10year storm is 4.18", as verified and verbally <br />confirmed by the City of Roseville Engineering staff on 7/15/16. The drainage area of this storm <br />sewer system is 120 acres. The total amount of drainage is: <br />4.18" X 120acres = 41.8 acre f eet or 13,620,589 gallons <br />The total impervious surface added in this assumption would be 3,250 ft^2. <br />The marginal water flow from this development would be: <br />3,250 ftZx 4.18" = 13,585 ft^2 inches <br />Convert this to acre ft: <br />13,585 f t2 inches *(1 f t\*� lacre 1= Q 026 acre f t <br />\12in� 43,560ft2� <br />Convert this to gallons: <br />325,851gallons <br />0.026acre f t*( )= 8,472 gallons <br />lacreft <br />The marginal contribution is 8,472 gallons. As a ratio: <br />8472 gallons <br />13,620,589 gallons 0.000621 = 0. 062% <br />Looking at this another way, the storm sewer system is overstressed as follows: <br />13,620,589 <br />= 1.28247 or 28.247% <br />13,620,589 — 3,000,000 <br />Adding in the assumed marginal runoff from above: <br />13,620,589 + 8,472 <br />= 1.28247 = 28.326% <br />13,620,589 — 3,000,0000 <br />The marginal runoff adds the following overstress to the system: <br />1.28326 <br />1.28247 1.00062 or 0.062% <br />_ __ _ . _ _ _ ___ <br />1926 Gluek Lane Minor Subdivision request PF16-014 response to facts of denial <br />6�Page <br />
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