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10 Flood-Frequency Characteristics of Wisconsin Streams <br /> • Table 2. Flood-frequency equations for streams in Wisconsin <br /> [A,contributing drainage area in square miles;S,main-channel slope in feet per mile;In,25-year,24-hour precipitation intensity,in inches minus 4.2; <br /> ST,storage,in percent of basin area plus 1.0;SP,soil permeability of the least-permeable soil horizon in inches per hour;SN,mean annual snowfall for <br /> 1961 through 1990 in inches;FOR,forest cover in percent of basin area plus 1;Qn,peak flood discharge in cubic feet per second,with an n-year recur- <br /> rence interval;SE,standard error of estimate of regression,in log units;ESE,equivalent standard error of estimate,in percent.Flood frequency areas are <br /> shown in figure 3.] <br /> Best-fit equation SE ESE Eq.no. <br /> Area 1(39 stations) <br /> Q2 = 99.9 A0.652 FOR-0254 125752 0.1803 43 1-1 <br /> Q5 = 190.0 A°•634 FOR-6-269 1258.45 .1709 40 1-2 <br /> Q'o = 35.0 A°.857 S°.463 FOR°•302 1236.92 .1631 38 1-3 <br /> Q25 = 38.1 A8.876 50.518 FOR-°3°8 /257'16 .1691 40 1-4 <br /> Q50 = 41.4A°.884 S°545 FOR 4131° 1237.36 .1764 42 1-5 <br /> IQlc0 = 44.2 A°.093 S°.57' FOR 41312 /257.36 .1855 44 1-6 <br /> Area 2(36 stations) <br /> Q2 = 13.0 A°•!18" SP°.63° 50.382 .1091 25 2-1 <br /> Q5 = 15.4 A°-900 SP 4)-682 S°•486 .1086 25 2-2 <br /> Qlo = 16.3 A091° SP-°3'° S°54' .1086 25 2-3 <br /> Q25 = 17.3A0•922 SP°•74° S°-600 .1100 26 2-4 <br /> Q50 = 17.9 A°•929 SP°'758 S°" .1118 26 2-5 <br /> Q100 = 18.3 A°•936 SP-8'775 So.668 .1153 27 2-6 <br /> • Area 3 3(57 stations) <br /> Q2 = 36.5 A°•832 Sp°•614 ST°14 <br /> /25"24 .1591 37 3-1 <br /> Q5 = 61.6 40.027 SP°.683 ST°.'69 1250.133 .1470 34 3-2 <br /> Q10 = 80.6 4°.825 SP 4.713 ST4 186 125.135 .1449 34 3-3 <br /> Q25 = 107.0 41182' SP-°343 ST°2°4 /25111 36 .1439 34 3-4 <br /> Q50 = 127.0 A9.819 SP-0J61 ST°215 /258.136 .1446 34 3-5 <br /> Q100 = 149.0 A°.818 SP 43.775 ST°227 /250.136 .1466 34 3-6 <br /> Area 4(40 stations) <br /> Q2 = 2.69A°.864 ST-°296 So-279 SP 4°58 SN°498 .1233 29 4-1 <br /> Q5 = 6.76A8.858 ST 41286 S°--393 SP'(1258 SN 837° .1131 26 4-2 <br /> Q10 = 9.74 A8256 ST 43286 50321 SP 48155 SN°332 .1063 25 4-3 <br /> Q25 = 13.7 A°.856 ST°.299 S°342 SP-9.246 SN 0299 .0995 23 4-4 <br /> QS0 = 16.6 A8.857 ST4 293 S°357 SP-9.238 S■°-28' .0964 22 4-5 <br /> Q100 = 19.4A°.857 ST°296 So.371 SP°.229 SN o-269 .0954 22 4-6 <br /> Area 5(28 stations) <br /> Q2 = 9.58A°.98' ST-°293 50.416 .1179 27 5-1 <br /> Q5 = 15.1 A°•912 ST-°358 S°.438 .1127 26 5-2 <br /> Q10 = 18.9 A°•913 ST°385 S°447 .1196 28 5-3 <br /> Q25 = 23.6 A°•915 ST°•408 S°457 .1349 32 5-4 <br /> Q59 = 27.0 A°.916 ST-°A2° S°1163 .1490 35 5-5 <br /> Q11 = 30.6 A°•916 ST°.43° S°.467 .1637 39 5-6 <br /> 410 <br />