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�0 �14=(�L�`� <br />����DMG��1� <br />LAND USE CON8IJLTANTB <br />C] �IANNINq Q �NOIM���INO O MMWYINO <br />O •11 M�DICAL�O�NTAL ��OO <br />N�I��T1. WN •�\Ot f0�. ���.��1• <br />ORAINAGE STUDY <br />I. PEAK RUNOFF RATE FOR 10—YEAR STORM <br />RATIONAL METHOD p - CIA <br />1� <br />C - Ru�off Coefficient <br />I = Rainfall Intensity <br />A - Acres� Area <br />T = Time of Concentration <br />c <br />UNDEVELOPED CDNDIlI0N5 <br />A = 7.0 9.0 acres offsite <br />C = 0.15 Table I City of Everett Stds. <br />I = 1.2 (offsite 1.1 in/hr.) <br />T� - 23 min. T� = 10 + �48�6�� Offsite T�= 10 + 00042(60)=40 <br />Q = CIA <br />q = (0.15)(1.2)(7.0) <br />q = 1.26 CFS <br />Offsite Q = (B)(1.1)(0.15) Q <br />. <br />= 1.32 CFS <br />II. RUNOFF COEFFICIENT AUERAGL <br />Cp = 0.80 from chart City of Everett <br />IlI. I•1AXIMUh1 OUTFLOW PER ACRE Ih1PERVI0U5NES5 (CFS/AC) <br />q = allowable Outflow <br />° Acreage x Runoff Coefficient (Cp) <br />Qo = 1.2G <br />(7)(0.80) <br />Qo = 0.225 CF'S/AC <br />� <br />L <br />� <br />.J <br />