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<br />Roaring Fork River
<br />Floodplain Information Report
<br />
<br />Town of Basalt, Eagle & Pitkin Counties, Colorado
<br />
<br />Roaring Fork River
<br />Floodplain Infonnation Report
<br />
<br />Town of Basalt, Eagle & Pitkin Counties, Colorado
<br />
<br />T ABLE OF CONTENTS
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<br />LIST OF TABLES AND FIGURES
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<br />PREFACE "".., """..",.." "',""'" ..', """" "".."...""""""....""""""....""""",....",..".", """" iii
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<br />TABLES:
<br />TABLE \ - USGS Gaging Stations
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<br />SECTION \ ,INTRODUCTION .....................,..........................................,...................... \
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<br />\,\ Authorization",.." ...""""..'...""....,..""""",..",'....".."""""""....""",..,................... \
<br />\,2 Previous Studies"",..".."""""".."""""""""..""""""""""""""""""""""""""""" \
<br />1.3 Purpose and Scope ................................,..................,....................,..,............,..,......, 2
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<br />\.4 Coordination"",..".."".."..",..",....,..""""",.."....,."..""""""".."""",..",....,....,....", 3
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<br />TABLE 2 - Design Flood Flows for the Roaring Fork River
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<br />TABLE 3 - Flood Frequency - Elevation and Discharge Data
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<br />TABLE 4 - Floodway Data
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<br />SECTION 2 - STUDY AREA DESCRIPTION ..........................,....................................., 3
<br />2,\ Drainage Basin Characteristics .....,....,..",..,.."..".."..,......,.."......"".....,......",..",..,.. 3
<br />2,2 Study Reach Description ..................................,...................................................... 3
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<br />2,3 Climate,.....,.......,...",...... ......,..,......",....".......,....."""'.."",....,'.."",......,..,,.....,....,.., 4
<br />2.4 Channel Instability ...".."..... .."....",..,...."...."..",............,..".."",......"",..'"..,....'...... 4
<br />2,5 Maps and Surveys ,........,.,..,.....,....",..,.."""..........,'.."....',.."""",..........,....,....",..,.. 4
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<br />FIGURES:
<br />FIGURE \ - Gage Records Roaring Fork River above Difficult Creek near Aspen
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<br />FIGURE 2 ' Gage Records Roaring Fork River near Aspen
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<br />SECTION 3 - FLOOD HISTORy....,............................,...........................,..............,......... 7
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<br />3,\ Gage Records "........",.."..." ........"""...."...."..,...."........'""",......""",.."",.......,.."" 7
<br />3.2 Flood Protection Measures ....................................................,............,................., 10
<br />3.3 Ruedi Reservoir Operations during the Spring \995............................................. 10
<br />3.4 Summary of Historical Floods............................................,........,......................... \\
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<br />FIGURE 3 - Gage Records Roaring Fork River at Aspen
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<br />FIGURE 4 - Gage Records Roaring Fork River at Glenwood Springs
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<br />FIGURE 5 - Roaring Fork River Hydrology Summary
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<br />FIGURE 6 - South Side Flow Trace Animation
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<br />SECTION 4 - HYDROLOGIC AND HYDRAULIC ANALYSIS ................................., 13
<br />4,\ Hydrologic Analysis "..",.."........"'..",.."...."..,..,...........,...,......."..,......,,..,..,....,.." \3
<br />4,2 Hydraulic Analysis .....",'..',...,....""",..,..'",.."......,.."....,.."""",......"",....""".."", \5
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<br />DRAWINGS:
<br />Location Map
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<br />SECTION 5 - INTERPRETATION AND USE OF REPORT DATA ..........................., \9
<br />5.1 Flood Frequency and Discharge ........,....................................................,..,.........., \9
<br />5,2 Flood Elevations "'"",.....,'""..",....'"""""",.."...."""""........"",...."""",..,..",.."" \9
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<br />RFI: Index Sheet
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<br />BIBLIOGRAPHY AND REFERENCES ,.."""""",.."""'..""""""""..""",..",,,"",....,.... 20
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<br />RFl - RF8: Floodplain Maps
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<br />\P - 9P: Floodplain Profiles
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<br />RS162 - RSIO: River Cross Sections
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<br />APPENDIX:
<br />HEC-RAS Hydraulic Data
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<br />'~t '.:~~'~><
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<br />November 14.2001
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<br />Page ii
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<br />November 14,2001
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