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A Seattle,Washington <br /> . <br /> f , , T 206.522www.paclan.9510d.com <br /> TURNING VISIONS INTO REALITY <br /> Rational Method Calculations <br /> Per Chapter 5, Volume I of the Manual, the rational method shall be used to determine <br /> design flows for conveyance calculations. The below table summarizes the sub-basin <br /> draining to each of the new catch basins and pipes. <br /> Catch Basin Sub-Basin Table <br /> Area(sf) Area(acre) <br /> Basin Impervious Pervious Total Impervious Pervious Total <br /> 8 9356 2206 11562 0.21 0.05 0.27 <br /> 9 11033 3467 14500 0.25 0.08 0.33 <br /> 10 6247 1560 7807 0.14 0.04 0.18 <br /> 11 0 0 0 0.00 0.00 0.00 <br /> 12 2293 0 2293 0.05 0.00 0.05 <br /> - 13 3842 0 3842 0.09 0.00 0.09 <br /> 14 4025 0 4025 0.09 0.00 0.09 <br /> 15 2485 0 2485 0.06 0.00 0.06 <br /> 16 0 0 0 0.00 0.00 0.00 <br /> 17 0 0 0 0.00 0.00 0.00 <br /> 18 25527 2500 28027 0.59 0.06 0.64 <br /> 19 8454 721 9175 0.19 0.02 0.21 <br /> 23 10416 1327 11743 0.24 0.03 0.27 <br /> 22 18043 387 18430 0.41 0.01 0.42 <br /> 30 92000 0 92000 2.11 0.00 2.11 <br /> 31 0 0 0 0.00 0.00 0.00 <br /> 32 0 0 0 0.00 0.00 0.00 <br /> Total 193721 12168 205889 4.45 0.28 4.73 <br /> See the Catch Basin Sub-Basin exhibit at the end of this appendix for a map showing these <br /> areas. <br /> Everett Mall Plaza Parcel Ill Retail Expansion- Stormwater Site Plan Page 38 <br />