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�Ashh��rn l�o�cnh�mics <br />�. DRAINAGG CALCULATIONS <br />�Cotal Arca of the Sitc = 19,»S SI' (0.449 ncres) <br />Dc��clopment �irca = 0.449 Acres <br />I'cr the Soil Survcy of thc Snohomish Coimty nrca, thc cntire sitc is ��Idcrwood-urhan land. <br />contplcs, and 2 to S percrnl. �chich cornsponds tu n'I\ �ic C soil. Por calculation �wr�ioscs. ❑ <br />1'ype C soil was uscd. <br />EXISTING SI'I'�: <br />(•'or lhe pw•poscs of dr:iinagc dcsign, thc cntire sitc is considcrcd rooltop and la���n li�r <br />drainagc calculations. <br />CN = SC <br />Tc = 32 M in. (1-10' Shcct �lo�c lir1:�.70 '%� a��g. ) <br />• L'-xisting Imper��ious total 1,306 SI� (QO? ,�c) <br />• �'ropos�d Pcr��ious 13.2�1 SI' (0.44G ac) <br />fotal Lot nrca 19,�58 SP (0.�1�19 acres.) <br />< <br />llEV�LOPI;D SITE: <br />New impervious arcas ��ill inclu�ic thc <br />• 13uilding rooltop �JOG 51' (0.1322 :u) <br />• Puved parking arca 5.95� SI� (0.1374 acl <br />• Impervious total 11,G90 Sl� (0.270 ac) <br />Lawn Tc =(.3 Min. (Assumed minimtun) CN = 98 <br />• Pcrvious <br />'l�otal Lot Arca <br />7.3G3 Sl� (0.179 :ic) <br />19.»S SF (0.4�19 ,icres.) <br />Iandscapcd �1rcas = 0.179 Acres CN = Rfi <br />La��•n Tc = 10.3 n�lin. (.�\ssunicd minimum) <br />*Rniujnl! <br />6-A�lonth = 0.99 in. <br />2- Ycar = l.�i in. <br />10- Ycnr = 2.25 in. <br />100- Ycar = 3.2� in. <br />\VI?I (l�l-��ll-R <br />7 <br />