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<br />TABLE OF CONTENTS
<br />
<br />SECTION 1 INTRODUCTION
<br />
<br />I. I Purpose "...,.".,.".,.",....."."",."."",.".,."".,.."".,..",."...""".,.",.,.,.",.,.,1
<br />1.2 Project Location and Background .......................................,...,.......,.... I
<br />1.3 Data Collection and Filed Investigation .............,.......................,.,....... I
<br />
<br />SECTION 2 HYDROLOGY
<br />
<br />2, I Flood Hydrology ".,..",.........",...,..."..,.,...".....""."....""..,.",.,."'.,....,,., 5
<br />2,1,1 Gage Records..................,....,..............................................,5
<br />2. 1.2 Flood Frequency Analysis .........,.......,............,....................5
<br />2.2 Watershed Hydrology Investigation....,................................................5
<br />2.2,1 Drainage Basin..................,.........,..............................,........,5
<br />2,2,2 Steamboat Lake ..........................................,..............,.........8
<br />2.2.3 Travel Time Issues................,................................,.,.......,...9
<br />2.2.4 Other Watershed Factors ..,...................,............................12
<br />
<br />SECTION 3 HYDRAULIC ANALYSIS
<br />
<br />3,1 Purpose ...".....,....,...."",.,..,."",..,...",.,...."'...'",,.....,."",.,.."...."...,.",.13
<br />3 ,2 Methodology .",...".,..'"'..,....."'...,..','..,....,,,....,,,'..,.,...",..,.",.,.",.,.,..,,13
<br />3.3 Flows to the West Fork of the Elk River ............................................ I3
<br />3.4 Model Calibration...,...................................................................,....... 17
<br />3,5 Superelevation Analysis ."..".",'...,..,'.',."."".... "".,..".""....".".',."., ,,22
<br />
<br />SECTION 4 CHANNEL STABILITY
<br />
<br />4.1 General",., ".".""...",."",."".."."", ".", "".,."".." "",.,.", ""."."", ".", ",23
<br />4.2 Bed and Bank Material Composition ....,..................................,.........24
<br />
<br />4,3 Geomorphic Analysis "."."",..,.""..,."."" ".""..,..",.,...,..",...",.,...",.,.24
<br />4.3,1 Purpose and Data ........................................,....,.............,...24
<br />4.3,2 Geologic Setting ....................,...............,.....,............,........24
<br />4.3.3 Geomorphic Setting and Historical Analysis ..,........,........25
<br />4.3 ,4 Comparative Analysis"" ".".",.".""."..", "..""".., "".,..""..28
<br />
<br />4.3.5 Bank Instability.""....."".,."""",."",.,.""",.".",..,."....."".. 2 8
<br />4,3.6 Conclusions.......,'" ...""".,..,.",.".""",.""",.".",.."""...""., 2 8
<br />
<br />SECTION 5 ALTERNATIVE ANALYSIS
<br />
<br />5,1 General"",.".".,.",., "",.,."."", '" "",.".,."" "."",.,.""." "" "" '" ",.,.,.",.,.29
<br />5,2 Conceptual Alternative Analysis ....,..,...,............................,.............,.29
<br />
<br />5,2,1 Constraints ..,..........,....,.........,..,....,..,..........,..........,.......,..,29
<br />5 ,2,2 Assumptions """,."."".".'" "'.',."".,,, "".,."""" '" ",.,.".".,., 30
<br />5,2,3 Bed Stability Measures..................................,.........,........,30
<br />5,2.4 Bank Stability Measures...,..,.............................................33
<br />5.2,5 Range of Alternatives ..,.........,............,......................,...,...35
<br />5,2,6 Cost Estimates .........,........,.........,..................,.....,.....,.,.....39
<br />
<br />5.3 Recommendations",."..".",.,..""..".""" "."".",. """ ",;"", ".", ".",.",." 39
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