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<br />000242 <br /> <br />Table 1. Regional flood-frequency equations. Colorado <br /> <br />[Q. discharge. in cubic feet per..sccof!.d; A. dr:Jinage area, in square miles; P. mean annual precipitation. in inches; S, mean drainJge-basin slope. in foot per foot] <br /> <br /> Recurrence Interval, Standard error Average standard <br /> Regression equation of the model, error of prediction, <br /> In years In percent In percent <br /> Mountain region <br /> 2 Q = 11.0 (A) 0.663 (5 + 1.0) JA65 58 52 <br /> 5 Q = 17.9 (A) 0.677 (5 + 1.0) '.719 48 47 <br /> 10 Q = no (A) 0.685 (5 + 1.0) '.304 44 45 <br /> 25 Q = 29.4 (A) 0.695 (5 + 1.0) '.004 41 44 <br /> 50 Q = 34.5 (A) 0.700 (5 + 1.0) 1.76S 41 44 <br /> 100 Q = 39.5 (A) 0.706 (5 + 1.0)1.577 42 44 <br /> 200 Q = 44.6 (A) 0.710 (5 + 1.0) 1.408 44 45 <br /> 500 Q= 51.5 (A) 0.7 IS (5 + 1.0) 1.209 48 47 <br /> Rio Grande region <br /> 2 Q=O.03 (A) 0.979 (P) 1.61S 78 61 <br /> 5 Q = 0.12 (A) 0.940 (Pi 1.384 64 55 <br /> 10 Q = 0.25 (A) 0.914 (P) 1.277 58 53 <br /> 25 Q = 0.52 (A) 0.884 (P) 1.117 53 51 <br /> 50 Q=0.81 (A) 0.804 (Pi 1.121 51 50 <br /> 100 Q = 1.19 (A) 0.846 (P) 1.074 50 49 <br /> 200 Q = 1.67 (A) 0.828 (P) 1.036 49 49 <br /> 500 Q = 2.48 (A) 0.808 (P) 0.995 50 49 <br /> Southwest region <br /> 2 Q = 28.7 (Al 0.699 85 62 <br />^ 5 Q = 50.5 (A) 0.693 74 58 <br />) <br />j 10 Q = 66.0 (A) 0.697 71 57 <br /> 25 Q = 86.3 (A) 0.704 71 57 <br />) 50 Q = 102.0 (A) 0.709 73 58 <br />) 100 Q= 118.4 (A) 0.715 76 59 <br />) 200 Q = 135.5 (A) 0.720 79 60 <br />500 Q = 159.4 (A) 0.728 85 62 <br />l Northwest region <br />) 2 Q = 0.39 (A) 0.684 (P) L304 83 62 <br /> 5 Q = 2.84 (A) 0.674 (P) 0 833 71 58 <br />l 10 Q = 7.56 (A) 0.671 (P) 0.601 68 56 <br />) 25 Q = 20.6 (A) 0669 (P) 0.362 67 56 <br />) 50 Q = 38.8 (A) 0.667 (P) 0210 67 56 <br />100 Q = 104.7 (A) 0.624 75 59 <br />) 200 Q = 118.5 (A) 0.624 78 60 <br />) 500 Q = 137.6 (A) 0.623 83 61 <br />) Plains region <br />2 Q = 39.0 (AI 0.486 233 93 <br />) 5 Q = 195.8 (A) 0.399 204 89 <br />) 10 Q = 364.6 (A) 0.400 212 90 <br /> 25 Q = 725.3 (A) 0.395 232 92 <br />) 50 Q= 1116(A)o.392 .250 95 <br />) 100 Q = 1640 (A) 0.388 267 96 <br />) 200 Q = 2324 (A) 0.385 285 98 <br />500 Q = 3534 (A) 0.380 306 100 <br />) <br />) <br /> ESTIMATING MAGNITUDE OF PEAK DISCHARGES 9 <br />, <br />, <br />