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n <br /> 0'"!'1,IidE 0'� DP,AINAGE DETENTIOId CALCL�LATIONS <br />� COLBY CEIITER <br />� . . .. . PURPOSE 01� Ti{ESE CALCULATIONS IS TO DETF:RMINE THE <br /> i �: U:� itcPLIdTION RACILITI�S AND FLOW R�Gt'LATI1Jr, D�'!ICES TO LIMIT <br />` '.�:J A1JD PI;O`'IDE DETENTION IN ACCURDANCE WITH THE "CITY OF EVERETT <br /> I �:�:IiINAGf; YLAid" DESIGIJ STAPJDARDS. <br /> 2. TI�E PROPERTY AS IT EXISTS IS RESIDEPJTIAL IN 19ATURE WITii <br /> I 'a '✓ACANT HOME A11D YARD AREA. DRAINAGE RUN5 OFF THE PROPERTY TO A <br /> ':':t �:i�T �URB INLET BASIN A1 THE CORNER OF COLBY AVfi'NUE AND 38th STRGET. <br /> I ; . THE SITE IS LOCATED WITHIN AR�'A A AS bESIGNATED ON THE "CITY <br /> I i".%!'.RETT DRAINAGE PLAN" REQUIRING AT� A'd�".LYSIS BASED Old A STORM <br /> DLiSICid FREQU�:IJCY UF ONE IN TEN YEARS . <br /> 4, THE TOTAL AREA AFFECTED BY DFVELOPME;J'?' — 0 . ��9 ACRES. <br /> 5• THE DRAIIIAG� AREA IS DIVIDED INTO THREE SU13 ARL'AS 01d TliE <br /> �RAINAGE PL/1H WIiICH AR� LAHEL�D AND SIZEb AS FOLLOWS : <br /> SUB AREA SIZE IN ACRES <br /> A 0.36 <br /> B o.12 <br /> G. ON SITE DETENTION STORP.GF. FOR SUB AREAS A A1dD R IS PROVIDED <br /> �Y '�: ;A'aS ON 24 IPdCH DIAMETER PIPE. <br /> %. POR EACH SUB AREA FLOW IS RF.GULATED BY NI:AIdS OT' AN <br /> OpT��ICF, OUTLET. I <br /> �. DETAIL COMPUTATIONS ARE PROVIb$D TO DETERMINE THF, VOLUME <br /> �F �mORAGE REQUTRED AND THE ORIFICE 5IZ$ TO LIMIT RUNOFF TO THE PRE— <br /> :,�.'1�LOPMENT VALU�, AND THE VOLUME OF STORAGE ?ROVIDI:D. SEE T}iE I <br /> ��,�� . . . .�,,�»�,mr�mrors n��n ��r�n r�c� ��Tn?r�s . � <br /> , _.,.. , �,1' �� <br />