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T <br />File No. 21-91-009-002-01 <br />May 23, 1991 <br />City of Everett Rainfall 10-Year Storm Design <br />Total Rainfall = 2.2 inches <br />Development of Hyetograph <br />Intensity <br />Inft <br />Total rainfall <br />in 20 min. <br />No. of <br />times on <br />hyetogr. <br />Total inches <br />of rainfall <br />% of <br />total <br />rainfall <br />Hyetogr. <br />value • <br />0.03 <br />0.0100 <br />4 <br />0.0400 <br />0.0180 <br />0.0045 <br />0.04 <br />0.0133 <br />22 <br />1 0.2926 <br />0.1316 <br />0.0060 <br />0.05 <br />0.0167 <br />12 <br />0.2004 <br />0.0901 <br />0.0075 <br />0.06 <br />0.0200 <br />8 <br />0.1600 <br />0.0719 <br />0.0090 <br />0.07 <br />0.0233 <br />4 <br />0.0932 <br />0.0419 <br />0.0105 <br />0.08 <br />0.0266 <br />4 <br />0.1064 <br />0.0478 <br />0.0120 <br />0.09 <br />0.0300 <br />2 <br />0.0600 <br />0.0270 <br />0.0135 <br />0.10 <br />0.0333 <br />2 <br />0.0666 <br />0.0299 <br />0.0150 <br />0.11 <br />0.0366 <br />2 <br />0.0732 <br />0.0329 <br />0.0165 <br />0.12 <br />0.0400 <br />2 <br />0.0800 <br />0.0360 <br />0.018 <br />0.14 <br />0.0466 <br />2 <br />0.0932 <br />0.0419 <br />0.0210 <br />0.17 <br />0.0566 <br />2 <br />0.1132 <br />0.0509 <br />0.0255 <br />0.22 <br />0.0733 <br />2 <br />0.1466 <br />0.0659 <br />0.0330 <br />0.29 1 <br />0.0966 <br />2 <br />0.1932 <br />0.0869 10.0435 <br />0.76 <br />0.2531 <br />2 <br />0.5062 <br />0.2276 <br />0.1138 <br />TOTAL <br />72 <br />2.2248 <br />1.000 <br />Hyetograph value = percentage of total rainfall divided by the number of times the <br />value appears on the hyetograph. <br />ge#4xxingVocg dcvn=.ann <br />