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Intermec/ Kenilworth Hills Stormwater Analysis Everett, WA <br /> Y <br /> I <br /> 25-Year, 1-Hour Peak Flow Analysis <br /> IIIModeling the 25-year, 1-hour storm <br /> IRainfall distribution: <br /> Using StormShed2G, a one hour rainfall distribution was created based on the rainfall <br /> distribution of a Type 1A rainfall event. <br /> I <br /> Rainfall depth: <br /> I Using the city of Everett IDF vs Duration Curve, an average intensity of 0.90 inches per <br /> hour was determined for the 25-year frequency. The following equation was used to <br /> calculate the rainfall depth: <br /> IAverage Rainfall Intensity (in/hr) x Duration (hr) = Rainfall Depth (in) <br /> I A 25-year, one hour storm, with an average intensity of 0.90 inches per hour would yield a <br /> total rainfall depth of 0.90 inches. <br /> -tT , TE Y .- C T.i4Rz /VTO,wl coNCE COS/IOS LEMin6 EiE ETT I+ <br /> ��T,._.-r` JY�T + ' , .- �6O..L'a4 -1_� 6".4 A/TE FALLS: },'AM/ TON- L MAN <br /> 6 V: 1-'. -: . 1 ;. 8L?r fl tl,'AMT q7A, ' S4'ILLE'. .itfORTON =_MO'SY':ROC _ . J <br /> ■.r�H�■�.■ ''"Tti: 3 L' p,4 'cf-11� boo,, -1A/OH6)1f/5.4� n 'S OQU.4L.f,'/E' � ; i <br /> Ilog4- i , . ,.-1!-I' - -r--.�..�1:_ ]y t1 �- `'-' 1 I �.1., �l ! , 1 1 1 ,i , <br /> r - - : Y`> .,. ry j dui+• ` ik�a -1f,s±q�i, (I _i Ti I I{;-1 <br /> Rh:"'Ifi'r`—r.,..,;!._1-Fr- <br /> m:■ ■i ; 1._ fit._ �:.__ y- l +: �1 = I I -. � ;.'I i ill <br /> iI ��I <br /> I <br /> 4 HI111 l ■ H1 11i .• ::-_:"::_---_.:--_-1. :.__----.-.--.--:TI1t.- <br /> 1 .sr1--1---:1- •_----J-r--.1-_-,I.1`- <br /> ;C 1ii■■■ ■ i . — ___ _ ___ 1II,---.iIi A- -1MmM•+1 1Nil1..11 43n10.1.11a:112i:1,:4M,11 41 <br /> . <br /> .I._-77-i-12_i-_r--.-A-:.-.,i--..i ad-"H: . _'� : o 1 --- - -- = a-.I-,---- - ::._ -_11111. I:_, <br /> z ■■!iW1IiJJiJiIiI!II! iiIIIPi1!9i9' <br /> e : IIT:AI . _ _= __:_ _ � _4.1► l i1 -Milt . - t .. <br /> ' r �eeeu iI ( I <br /> / 11 1 111�1i=101161314 I�Iz■.■�._...■■■.■ i..13i■i ■r■"�611 ■■■:�l1 <br /> ■11 := WV- 9- II' _ -_: 11104111111 <br /> iifiii7■■e■ r■■■.:��_____ ■ii:wrr*i■rrrr■:r as <br /> 0 /0 20 3D 40 50 60 70 BO 90 /00 <br /> IIFigure 1-5.1 City of Everett Rainfall Intensity vs Duration Curves <br /> IPACLAND Job# 50175001 Page 8 <br />