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<br />CONTENTS
<br />
<br />Abstract, ........"""......." ......... ,.. ......""......."",.......""......., ..................,.."...."""......",......."........,.......".'"""...."".......".... I
<br />Introduction........".."""",...."""........",.......... .......... ,........,",...,""',......,",........."......."..""",...""",......,."..........,....,.,.,..", 2
<br />Purpose and Scope...... .........,......,"',......."",.........,.........,........",....".",........,.............." ......., ..,...,."",.......,.........,.... 7
<br />Acknowledgments ..."........".........,......."",......"",.......",........".......,......"",.,.."""..""",.......",...............",."""".,.,. 7
<br />Physical Charactetistics of the Lees FelTy Gaging Reach..............................................................,................................. 7
<br />Stage and Discharge Measurements in the Lees FelTy Reach ..............................,............................................,.., 8
<br />The Hydraulic Control and its Effect on the Shape of the Stage-Discharge Rating Curve.................................. 8
<br />Pre-Dam Hysteresis in the Water-Surface Slope in the Reach Upstream from the Lees Ferry Gage ................, 15
<br />Colorado River Floods at Lees Feny ........................................................................,........,............................................., 17
<br />Estimate of the Peak Discharge of the 1921 Flood at Lees Feny.......................................................................... 18
<br />The Key Assumption of lS. Gatewood and RS. Hunter..........................................,................................., 18
<br />Other Measurements of the Peak Discharge of the 1921 Flood Made Downstream and
<br />
<br />Upstream from Lees Ferry ..'.."".."""".......",........".......,......,... ,......",...""",.......',.......,.......",..,.". 19
<br />Revised Estimate of the Peak Discharge of the 1921 Flood at Lees Ferry.................................................. 27
<br />Estimate of the Peak Discharge of the 1884 Flood at Lees Feny....,......,.............................................................. 29
<br />The Original V,S. Geological Survey Estimate of the Peak Discharge of the 1884 Flood ......................., 29
<br />Revised Estimate of the Peak Discharge of the 1884 Flood at Lees Ferry..............,..,................................ 31
<br />Implications for Previous Estimates of Paleoflood Discharges ........................................................,.................... 31
<br />Computation of the Continuous Record ofInstantaneous Discharge at Lees FelTY for Water Years
<br />
<br />1921-2000..." ......'..,',.....,'"",........",.........",......... ........"....."..,',...,"'",.......",........",..................."""",.."..",..... 33
<br />Methods Used by the U.S. Geological Survey to Compute the Previously Published Daily
<br />Mean Discharge Record for Water Years 1921-86.................................................................................. 33
<br />Methods Used in this Study to Compute the Continuous Record of Instantaneous Discharge for
<br />
<br />Water Years 1921-86.",.........."...... ..,......,"",.....,"",.....,"",.......".................."...""",....."",..................,.. 3 7
<br />The Continuous Record ofInstantaneous Discharge for Water Years 1921-2000............,................................. 39
<br />Analysis of the Continuous Record of Instantaneous Discharge..................................................................................... 42
<br />Flow Duration, Sub-Daily Discharge Variability, and Sediment TranspOlt duting the
<br />
<br />Pre-Dam Petiod........".......""",....""",.........".........",......... ,.......,'",...."""....."",.......",.......,......""...,.,.",. 42
<br />Effects of the Operation of Glen Canyon Dam on Flow Duration, Sub-Daily Discharge
<br />Variability, and Sediment Transport",....""",........"..........",. .....,..,..,..",....".."........"............""""......",.. 45
<br />Flood Frequency during the Pre-Dam Petiod ......................................................................................................... 52
<br />Effect of the Operation of Glen Canyon Dam on Flood Frequency......................................,............................... 54
<br />
<br />Conclusions........ ...............,........ ........................................................ .......... ............................................... ........................ 56
<br />References Cited.....""",........""............ ........ ..........,......,"'""........,',....................,...."..".,...""..""""........,.................".., 58
<br />Appendix A: List of Accession, Box, and Location Numbers where the U.S, Geological Survey
<br />Data Used in this Study are Stored in the Federal Records Centers ................................................................. 61
<br />Appendix B: Important Events in the History of the Lees Feny Gaging Station ........................................................... 65
<br />Appendix C: December 30, 1929, Memorandum ofW.E, Dickinson .........,.......,......................................,................,.. 85
<br />Appendix D: Relationship between the Datums of the LaRue and Number I Gages.................................................... 89
<br />Appendix E: Days with Disagreement Greater than or Equal to 5 Percent between the Daily Mean
<br />Discharge Computed from the Continuous Record of Instantaneous Discharge and the
<br />Published Daily Mean Discharge...,...""""........."...........,..... ....,...,""".......",......,."..............""......""........".... 97
<br />Appendix F: Monthly Flow-Duration Curves Computed from the Continuous Record of
<br />
<br />Instantaneous Discharge.......,',..................... ........,",......,"",....,"",........,.................""...",........."...................,., 109
<br />Appendix G: Monthly Exceedance Curves of the Daily Range in Discharge Computed from the
<br />Continuous Record of Instautaneous Discharge ................................................................................................ 115
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<br />02253
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<br />Contents III
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