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Below are the rational method model results for the 100-year event. The tailwater elevation is set to <br /> the tailwater expected during MHHW downstream. There is some pipe surcharge and minimal <br /> overtopping during this event. Minimal ponding of less than 4" will occur at CB#12, but all ponding <br /> will be contained onsite. There will be no overtopping of the downstream drainage system. <br /> 16.130ft 15.400ft 14.114ft 13.526ft 11.202ft 10.336ft <br /> 4.79 cfs - _0 [6.94 cfs] 49.55 cf <br /> 15.119ft 14.106ft 6. cfs 9.57 s <br /> 12.709 <br /> • cfs <br /> 1.5 cfs • s • <br /> A <br /> 1.8 cfs 1.63 cis 14 495 ft <br /> 15 631 ft 0.1 cis <br /> 0.i cis <br /> 4.6. cfs 410 <br /> 16.298 ft 15 525 ft • 16.410 ft 16.968 ft 16.073 ft 16.567 ft 17 183 ft <br /> • OM iris > • 0.96 rfa -• • [0.97 cis] > 40 < 0.72 cfs 12.902 ft <br /> • <br /> 0.6 cfs <br /> 16 464 ft 16.999ft <br /> •-En69 cis_40 1 .070ft <br /> A 0 <br /> [0.6 cfs] <br /> 3.9- cfs <br /> 1 .913 ft <br /> • <br /> 16663ft <br /> • 18.146 ft 18.821 ft 18.887 ft <br /> 17.797 ft <br /> 3.8 cfs • <br /> 6.748 ft 0.76 cfs <br /> 1.0 cfs 0.6 cfs 1 i '359 ft <br /> • 0.7 cfs <br /> cis • <br /> 1 907 ft 1 396 ft 1 114 ft 1.1 cfs 18.370 ft <br /> •- 11 1.4 cfs] • -< [1.99 cis] <br /> • <br /> Less than 4" of ponding. Allil <br /> C,,, 1,, <br /> contained onsite. <br /> 2215 North 30th Street Glacier Peak <br /> Suite 300 APP. <br /> Tacoma,WA 984030 H B L A <br /> 253.383.2422 TEL B V <br /> 253.383.2572 FAx 100-year Onsite Conveyance Analysis <br />