WSP02347

• File Number: 8102
• Description: Arkansas River Basin Basic Hydrology
• State: CO
• Basin: Arkansas
• Water Division: 2
• Date: 5/7/1999
• Author: Inter-Fluve Inc
• Title: Fluvial Geomorphic Assessment of Upper Arkansas River - Final Report
• Water Supply Pro - Doc Type: Report/Study

List of Figures (continued)

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Table of Contents (continued)

Figure 6.6 Number of days measured flows exceeded effective discharge: Arkansas River

at Leadville..............,........................,........................................................................ 45
Figure 6.7 Channel topwidth vs bankfull discharge relationships for alluvial channels
showing overwidened state ofproject subreaches (Hey and Thome, 1986) ............ 46

Figure 7.1. Discharge vs. Area Comparison..................................................................... 50
Figure 7.2 Upper Arkansas River Comparison of Peak Discharge Characteristics.......... 51
Figure 7.3 Upper Arkansas Flood Frequency Curves....................................................... 52
Figure 7.4 Reach average velocity estimates................................................................... 58
Figure 7.5 Reach average shear stress estimates .............................................................. 59
Figure 7.6 Reach average hydraulic depth estimates........................................................ 60
Figure 7.7 Incipient motion characteristics, 1M Sites 1-6................................................. 69
Figure 7.8 1M Site 1: Percentage of sediment mobilization........................................... 71
Figure 7.9 1M Site 2: Percentage of sediment mobilization ........................................... 72
Figure 7.10 1M Site 5: Percentage of sediment mobilization .......................................... 73

Figure 8.1 Planform changes, migration corridor, and high priority erosion sites,

Subreach 1. .............. ... ............. ......... ......... ................. ............. .......,.. ..... ................... 77
Figure 8.2 Planform changes, migration corridor, and high priority erosion sites,

Subreach 2,... .......................... .................. .......... ......... ...... ..... .................... ............... 78
Figure 8.3 Planform changes, migration corridor, and high priority erosion sites,

Subreach 3.......................... ............... .............. ............... ..... .... .................. .... ............ 80
Figure 8.4 Planform changes, migration corridor, and high priority erosion sites,

Subreach 4. ,........... ,. ,.. ..... .....,., ,... ... .... ... ,.. .,....... ... .... ,.. ...... ..... ....... ,., ..... ............ '....... 83
Figure 8.5 Hydraulic model cross-sections showing perched secondary channel thread
(arrow). View is downstream...................................................................................84
Figure 8.6 Planform changes, migration corridor, and high priority erosion sites,

Subreach 5,.. ....... ....... ...., .... ... ,......,.... ......... ..... ,.....,........ ,. .... ,.... ,...... ........ .....,. ,......... 85
Figure 8.7 Planform changes, migration corridor, and high priority erosion sites,

Subreach 6,...... ...... ,.,... ..,... ... ,...... ... .... ... .,. .,.... .,........... ,. .... ,...... ..... ,. ........ .................. 87
Figure 8.8 Hydraulic model cross-sections showing perched secondary channel thread
(arrow). View is downstream......,...................................,........................................ 88
Figure 8.9 Planform changes, migration corridor, and high priority erosion sites,

Subreach 7. .....,.... ... ..... ... ...........,........... ,.......,.,......... ... .......... ..... ....... ............... ....,... 90

May 7, 1999

Fluvial Geomorphological Assessment
Upper Arkansas River

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Figure 9.1 Conceptual approaches to localized bankline erosion control....................... 93
Figure 9.2 Schematic depiction of the migration corridor concept ................................. 94
Figure 9.3 Schematic depiction of compound channel concept ...................................... 96
Figure 9.4 Schematic drawing showing consolidation of perched channel thread into

primary channel.......,..............................................................................................101
Figure 9.5 Schematic drawing showing channel relocation concept............................. 102