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� . � <br /> Conveyance Design _ <br /> ( '1'hc prcposcJ slorni drain s��stcm will cnm•ey surfacc nmoff frotn Ihc Mounlain Vicw Plaza <br /> huilding roofs, parking lots, sidc�calks, and landscapc arcas. This stonn drain systcm is dcsignrJ <br /> I lo com�cy thc 24-hour. 25-ycar stonn cvcnL ���hich has a rainfall dcplh of?GO inchcs as Jclincd <br /> in thc COI:�Slor�rnrurcr Alrnw,��en�ent Ahr�urnl. Thc rational method ��as uscd fiir pipc sitin� <br /> calcul.�uo„S. n 5p���.�asi,«� sno���ing pipc sizc calculations is incluJcd in Appcndix 13. <br /> ( 'l�hc pipes���cre sizcd lo conr�c��thc 25->'car ninoff���ilhout cxcecding 90 percenl capacity. Thc <br /> 12-inch pipc is adcquatc to com•c�� thc runoff from Ihc parkine lo�s ;md roofs. <br /> I <br /> Detention Design <br /> IStorm��atcr dclention lor thc sitc ���ill bc providcd by an undcrground coocrctc �•ault. l�hc vaull <br /> f is siud to match 50 percenl of thc c�isting 2-ycar Oo��� and 100 perccnt ol lhc cxisling 10- and <br /> I100-ycar �lo���s per the COF. ,Sra•nnrarcr nlm�a�,>eme�u hlnnuc�l. Lxisting conditions arc modcicd <br /> as sccond crowlh foresl ���ilh :i curvc nnmbcr(CN)of 81. Calcidalions arc providcd in <br /> � Appcndis I3. <br /> 1 <br /> IWater Quality Design _ _ _____ _ _ ___ __ <br /> I ,\ SlormFihrr" caru idgc mcdia filtcr �ault �cill pro��idc ��atcr yuality trcauucnl lor Ihc pa�•cd <br /> ,ircas subjccl lo ��chicular u�aflic. >torm�ealcr�vill p,iss through thc ddcntion ��aidl and :i <br /> Stonnccptor` to procidc �nclrr.dmcnt ol�scdimcnts and u�ash bcti,rc cnlcring thc Slomil�iltcr". <br /> I I�hc liltcis usc ,i "!_PG mcdia as rccommcndcd by Ihc \Vashington Slalc DOB. Thc filtcr is sizcd <br /> to Ircat thc 2-��car dischar�c lium Ihc dcicntion cault using thc StonnPiltcr� Dcsign \lanual mas:; <br /> loading mclhud and COG rcyuirrmcnls li�r lillcrs lucatcd d����nslrcam ofdcicntion. Runoll'G'om <br /> I building rnofs is assumcd to contrihutc lo thc mass IoaJi���. 5« Appcndiz B for StonnFiltcr` <br /> sizing cakulations. A 72-inch m,mhole ��ilh 7 tihcr r1I'lllll_L'CS 1S 1'l'I�UIPI`lL �Ill' lIl`ll'�1U011 5\'SlClll <br /> ruuting �cas calculatcd usin� thc Santa 13:nhar;i Urhan Fh�drogruph mcthod and thc <br /> I SlormSllliDrr.� computcr��rugr;mi. 'I hr titormPillrr� inlcrnal b�pass is r.ipahlc ofU�passin� thc <br /> Ilo�cs in r�crss ol thc 2-�rar storm. <br /> Maintenance <br /> Thr I)ctcnli�,n �;iult, tilurnuc�uur`, and Sl�,rml illcr' must hc m;iintaincJ accordine tu COI: <br /> rcquircm�nts anJ �hc nwnulaclurcrs' main�cn:mtt manuals. :1 ccrlificalc of mainlcnancc must hc <br /> submitted to Ihc ('il� annuall�. Thc moinirn,uir� ;ind u�icrations manuak :irc incluJcd in <br /> \���icndi� C. <br /> ti:i��-mmi _"pl U' iul� h�-diuuliec hcdipLdnr ii <br /> Sicvcrs Duecy Retail � July 18.20W <br /> . Hydraulics Report •�• <br /> • � �i � � <br />