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• • <br /> o a <br /> � j�wo �l0� -U3 �p <br /> DAVID EVANS <br /> r <br /> nNcASSOCIATES iNc. ? <br /> ; •, <br /> � <br /> MEMORANDUM � , ,; <br /> DATE: Septcmber 27, 2005 ` t� <br /> TO: Janc "Limmcrnian r � � <br /> FROM: Jack Molvcr � �� <br /> � , <br /> SUBJECT: Storm Drainage calculations- revised �` <br /> PROJECT: William Mcssncr Shart Plat/rrank 13onapart Condominimums <br /> PROJECT NO: OEVT0094 <br /> COPIES: <br /> Janc, <br /> Storm runofl from tlicse sites wdl bc callected and rou(cd to a pump eysten:. 'the elcvation of die combincd <br /> scwer in Grand is too lo���to scrvc the sitc. The conswction plans sp�•cify that the roof and area drains are to be <br /> routed to the graviry system in Grand whcre ever possible. For thc purpose of sizing the pump, it will be assumed <br /> that all of thc roof arcas will drain into die pwnp chambcr. <br /> ,. . , ,_ , � � � :.........:...data ^:.",c <br /> �C�ON'�fl' II1C dCVI'IOpCU NIIOII ��ICS�5 I1704CIW USIIIb f:IUUIiJI IIICIIIVVJIVby diiu idiiva�i uu�uo�.� %� <br /> Ciry of Gverett. �hc puntp syslem a'ill be selcctcd bascd on the 100 year peak flow of approximately 290 <br /> gallons/minutc. , <br /> 13ascd upon Ihis analysis, it appcars tl�at a onc IiY pump, 230 V, 1 l50 RPhI �cith a capacity ol 2)0 GPA4 �viil <br /> su fficc. <br /> MRI m n <br /> MODELED 2 3.69 0.556 <br /> AS 5 5.20 0.570 <br /> EVERETT 10 6.37 0.575 <br /> 25 7.83 0.582 <br /> 50 8.96 0.585 <br /> 100 10.07 0.586 <br /> MESSNER SHORTPLAT <br /> DESIGN STORM= 100 \'R <br /> TIME <br /> OF CONCENTRATION�MIN) <br /> AT <br /> CB NUMBER SUM SUA1 PREV TIME IN TOTAL I �=CIA <br /> AREA <br /> FROM TO I (ac) 'C' "CA" 'A" "CA' POINT PIPE TIME inlhr cfs <br /> A1 A2 � 0.27 0.90 024 027 0.24 10.00 2.67 0.64 <br /> � <br /> — II. <br /> 1620 VVest Idarine V�ew Drice. Suite 200 Everelt Washinglon 98201 Phone:425.259.4099 Facsimile:425.259.3230 <br />