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� OUTLINE OF DftAINAGE DESIGIJ AND DETENTION CAL�ULATIOtIS FOR <br /> • PAR 4 PLAZA CONDOMI�IUMS <br /> , 1. Ti{E PROPOSED SITE IS WITHIN CITY OF EVERETT DRAINAGE AREA <br /> "B" , REQUIRIN6 CALCULATION OF RUtdOFF BEFORE DEVELOPMENT USIN(; THE <br /> 10 YEAR STORM AND AFTER DEVELOPMENT USING T}iE 25 YEAR STORM. <br /> 2, THE PROPOSED SITE HAS BEEN REQRADED FLAT, FORMERLY <br /> SLOPINQ TO THE WEST. <br /> 3. CITY OF EVERETT STANDARD RUNOFF FACTORS OF 0.2 FOR BEFORE <br /> DEVELOPMENT COPIDITI0N5 AND 0.9 FOR ANY POSSIBLE FUTUAE DEVELOPMENT <br /> CONDITIONS WERT USED IN ACCORDANCE WITH CURRENT POLICY REGAADINa <br /> AREAS OF LESS THAN 3•� ACRES. <br /> 4 . TOTAL DRAINA(3E AREA IS 1 .3 ACRES. <br /> 5. COLLECTION AND DETENTION WILL BE PROVIDGD BY MEFNS OF A <br /> PARKIN(i LOT WITH AN ItdVERTED CROWN AND CATCH BASIN WITH API ORIFICE <br /> OUTLET. <br /> 6. DISC}IARGE WILL BE INTO THE ROADSIDE CULVERT AND DITCH <br /> ALONG THE NORTHERN ED(iE OF CASINO ROAD. <br /> '/ . DGTAIL COMPUTATIONS IN ACCORDANCG WITH THE CITY OF EVEflETT <br /> DRAINA�E ORDINANCE AND SUBSEQUENT COMMUNICATIONS FROM TIIE CITY ARE <br /> PROVIDED TO DETERMINE THE VOLUME OF STORAGE REQUIRED, TIiE VOLUME 0[�' <br /> STOAAGF. PROVIDED, AND THE ORIFICE SIZE TO LIMIT RUNOFP TO T11E <br /> ALLOWABLE VA1.,UE. SEE ATTACtIED COMPUTATIONS AND PLANS FOR DETAILS. <br /> N w�S,Fq� <br /> � <br /> � <br /> W <br /> /'1FOI31 EP�'���4• <br /> `��'ion � Er <br />