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<br />OJJ233
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<br />CONTENTS
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<br />Abstract........,............,................................. ........................,.....................................,.....................,.,...................................
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<br />Introduction....................... ...................... ..........................,......................,....,.......... ................................................ .,............
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<br />Purpose and Scope.. .............................,...................................... .,... ,............................... ..................................... ,..,...
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<br />Previous Studies ......... ....... ......... .......................... ................. .................. ........ ............. ..... ....... ......... .............
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<br />I
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<br />2
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<br />Approach..........,.........,........,................... .,.................,............................ ...................................................... .,............
<br />Flood-Frequency Anal y sis at Streamftow-Gaging Stations........................................,.................................. .,..
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<br />Regional Flood- Frequency Analysis.................................. ...,............,............................................................... 4
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<br />Regression Anal ysis......,.,.................."..........,........ ........................ .............................."................................. ".".................... 7
<br />Multiple Regression and Drainage-Basin Characteristics ....................................... .......... ...................,................,..... 7
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<br />Generalized Least-Squares Regression......................,................................................................... ............................. 7
<br />Limitations and Accuracy of Regression Equations .... ....................................................................... ......................... 8
<br />Estimating Magnitude of Peak Discharges. ....................................,. .,.......................... .,........ .,................... .,............. .,......... 8
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<br />Gaged Sites...................................... .............................................................. ...,........., .,.......,........... .,......................... 8
<br />Sites near Gaging Stations on the Same Stream ..................................,...............................,..............................,........ 10
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<br />U ngaged Siles ... ,..,............... ,.............. ...,.................................. .,..................................... ................... ......................... 10
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<br />Summary ............................... ,........... ,......... .............................,................................................................., ...,....................... I I
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<br />References Cited .......... ....,.......................................................................................................................,..........., .,. ,... ..,...... 12
<br />15
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<br />Supplemental Data.......
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<br />FIGURES
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<br />1. Map showing boundaries of hydrologic regions and locations of streamftow-gaging stations
<br />in Colorado and adjacent States...... ,.............................. ,..,....................... ,..................... .................... ....,.................., 3
<br />2. Map showing generalized skew coefficients of the logarithms of annual maximum streamflow
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<br />for Colorado and adj acent States...... ........ ...,. ,................ ......,. ,.. .,.. ..,...............,. .......... ...,...... ................ .,....... .,.......... 5
<br />3, Graph showing flood-frequency curve for Lake Fork at Gateview, Colorado ...........,.................,.............................. 6
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<br />TABLES
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<br />I. Regional flood-frequency equations, Colorado ......,..........................................................................,............,........ 9
<br />2, Basin characteristics and the range of values used in the analysis...............,...................................................,...... 10
<br />3. Drainage-basin characteristics and flood-frequency data at streamflow-gaging stations...............,........................ 16
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<br />CONVERSION FACTORS AND VERTICAL DATUM
<br />
<br />Multiply
<br />
<br />By
<br />
<br />To obtain
<br />
<br />J
<br />
<br />inch
<br />foot (ft)
<br />mile
<br />square mile (mj2)
<br />cubic foot per second (ftJ/s)
<br />
<br />25.4
<br />0.3048
<br />1.609
<br />2.59
<br />0.02832
<br />
<br />millimeter
<br />meter
<br />kilometer
<br />square kilometer
<br />cubic meter per second
<br />
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<br />J
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<br />CONTENTS III
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