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s <br />n <br />Thuy <br />� <br />. :�:,> <br />Pe=P-Ie=P-0.23 . '. :1 <br />� � ..� •.:':,".t i� <br />ehere P ie the total atorm rainfell in inches. SubetltuLing equetiorc 2-�C':'�,-" <br />in equetion 2-2, <br />� Q = P - 0.25 2 ' �� `-.; . : <br />� <br />P+0.8S i�l• 2-Sy: �;�"; <br />Potential abatraetion S ie related to the eoil end cover conditione of.a 3,•?� ' <br />•sterahed. The runoff cur•re manber, ehich ie elso related to aoil and ' <br />cover conditiona, is related to poLentiel ebatreation S by <br />CN = Ss�� iEq. 2_g) <br />fran which <br />S =1��-10 <br />iEq• 2-7) <br />The aolution to equation 2-5 ia ehown in tablz 2-1 for a range of CN's <br />end total reinfall amounte. <br />Table 2-1,_ Runc <br />�C <br />Rainfall <br />(Snch��) <br />60 <br />depth in inchea for seleet�d CN�a end reinfell amounte <br />.►v. Tc� �--�C`.� 2-r7� <br />Curva lhmber (Cd)!/ <br />65. 70 75 BO 85 90 95 g8 <br />1.0 0 0 0 oA3 0.08 o.1T 0.32 ,5( ,qy <br />1.4 0 0.02 0 06 0.13 0.24 0.39 0.61 •�i4 •99 <br />1.6 0.01 0.05 0.11 • 0.20 0.34 u.52 0.76 1.11 1.38 <br />1.8 0.03 0.09 0.17 0.29 0.44 0.65 o.g3 1.29 1.SB <br />2•0 0.06 0.14 0.24 0.38 0.56 0.80 1.09 1.48 1.TT <br />2.5 0.17 0.30 0.46 0.65 0.89 1.18 1.53. 1.96 2.27 <br />3.0 0.33 0.51 0.72 0.96 1.25 1.59 1.98 2.45 2.78 <br />4.0 0,76 1.03 1.33 1.57 2.04 2,46 2.92 3.43 3.77 <br />S.o 1.30 1.65 2.04 2.45 2.89 3.37 3.88 4.42 4,76 <br />6.0 1.92 2.35 2.80 3.28 3.78 4.31 4.85 5.41 5.76 <br />7•0 2.60 3.10 3.62 4.15 4.ci9 5.�6 5.82 6.L1 6.76 <br />8.0 3.33 3.90 4.47 5,04 5.62 6.22 6.81 7.40 7.T6 <br />9•� 4.10 4.72 5.34 5.95 6.57 7.19 7.79 B.4o 8.76 <br />10.0 4.90 5.57 6.23 6.88 7.52 8.16 8.78 g.40 9.76 <br />11.0 5.72 6.44 7.13 7.82 8.48 9.14 g.77 10.39 10.76 <br />12.0 6.56 7.32 .B.oS 8.7I, 9.45 10.12 10.�6 31.39 11.76 <br />;� To obt�in runoff depthe for Cl1�� �a othar raint�il emounte not <br />ehovp in thie tsble, uee an arlLAaetic lnterpol�tlon. <br />