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c <br />KING COUNTY, WASHSNCiTON, SURFACE WATER DESIGN MANUAL <br />FIGURE 4.3.4A NOMOGRAPH FOR SIZING CIRCULAR DRAINS FLOWING FULL �- -�� <br />1000 `� <br />904 <br />gpp .0001 <br />700 �2.0 <br />6� .0002 <br />—500 .0003 Minimum <br />qpp .000a .000t Allowable <br />.0005 Velocity <br />.00C6 (Flowing� 3.0 <br />300 ,,,,� „ Full) <br />r�� <br />100 <br />90 <br />BO <br />70 <br />�j 60 <br />LL 5C <br />U <br />Z 40 <br />w <br />� 30 <br />Q <br />2 <br />U <br />N <br />0 ZD <br />9 <br />A <br />7 <br />s <br />5 <br />4 <br />3 <br />2 <br />t <br />120 <br />108 <br />90 <br />� <br />78 <br />72 <br />66 <br />60 <br />54 <br />N 48 <br />w 42 <br />2 <br />U <br />Z 36 <br />Z 33 <br />30 <br />a 27 <br />a <br />LL �4 <br />� 21 <br />¢ <br />W 78 <br />F <br />W <br />� �$ <br />Q <br />e <br />io <br />8 <br />L6 <br />v � _y., ...,.,... <br />o .00t <br />0 9003 <br />i� 0004 <br />c .002 .0005 <br />Q .0006 <br />p .003 ,pG08 <br />LL •�� .001 <br />a .005 <br />Q .006 N <br />.- <br />;� .008 .00T U / <br />.O7 � <br />.003 �� <br />.004' 2 <br />.0 ;� O <br />.03 .008 oW, <br />.04 .010 O <br />.05 y <br />SAMPLE USE <br />24" dia. CMP @ 2Yo slope yields <br />77cfs @ 5.2 FPS velocity <br />(n = 0.024) <br />Values per Manning's Equation <br />Q_ ( 1.49� AR'iiSY: <br />n ° <br />Th's tabie can be converted <br />to ott er "r�" values by applying <br />iormula: <br />Qt n1 <br />']2 a n2 <br />43.4-18 <br />- 4.0 <br />5.0 <br />0 <br />Z <br />O <br />v 6.0 <br />w <br />� <br />w 7.0 <br />a <br />w 8.0 <br />w <br />LL 9.0 � <br />2 __ <br />10.0 <br />H <br />U <br />O <br />J <br />W <br />� <br />0 <br />a0.0 <br />1�90 <br />