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

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Table of Contents (continued)

10. Summary and Conclusions ,............,..................,......................,.,......,....,.....,..........1 05

II. Recommendations. ... ... ... ,... ........ .... ... ..... .....,..... .... ........... ........... .... ..... .... ........... .....1 06

12. References Cited..... ,.. ... .... ....... ........ ........ ... ,.... .... ..... ............... .... ..... .... ..... ...... ........1 07

13. Appendices ,.. ,. ,. ,........ ....... ..., ,........ ..,.. ..... ... ... ...... ,.: ... ,..... .... ,....... ,.. ............. .............111
13,1. Appendix A: Supporting Geomorphic Data ......,........................................... III
13.2, Appendix B: HEC.RAS Profiles ,..................................,............................... III
13.3. Appendix C: HEC.RAS Hydraulic Output.............,.........................,..........,. III

List of Fif!ures

Figure 1.1 Index Map of project Area, Upper Arkansas River Basin, Colorado,..........,.... 3
Figure 1.2 Project reach map showing geomorphic subreaches and incipient motion

analysis sites (IM 1.6).......,............................................,...............................,..........., 4

Figure 3.1 Schematic diagram of water systems operations in the Upper Arkansas River

Basin (URS, 1998) .........................................................,.........................,................ 10
Figure 3.2 Mean daily discharge, Arkansas River at Leadville and Malta, 1976-1978..14
Figure 3.3 Mean daily discharge, Arkansas River at Leadville and Malta, 1979.1981... 15
Figure 3.4 Mean daily discharge, Arkansas River at Leadville and Malta, 1982-1983...16
Figure 3.5 Turquoise Lake operations: Native inflow vs. releases to Lake Fork, April.
July, 1992 and 1993 (BOR, 1999) .........................................,.................................. 17
Figure 3.6 Turquoise Lake operations: Native inflow vs. releases to Lake Fork, April-
July, 1994 and 1995 (BOR, 1999) ......................,...............................,................,.... 18
Figure 3.7 Turquoise Lake operations: Native inflow vs. releases to Lake Fork, April-
July, 1997 and 1998 (BOR, 1999) .........,.............,.......,.........................,..................19
Figure 3.8 Flow duration for Arkansas River at Leadville and Malta, 1976-1983..........20
Figure 3,9 Flow duration for Arkansas River at Leadville and below Empire Gulch,

1990-1993 .......... ,.. ... ........ ......... ,....... ..... ......................... ........ ,..... .... ,.. .......,... .... ...... 20
Figure 3.10 Ratio of flow duration unit duration discharges upstream of downstream of
Lake fork Creek, 1976-1983 and 1990-1993 ,....................,.,.................................... 21

Figure 5.1 Particle size gradations of sampled riffles, Upper Arkansas River ,................ 34

Figure 6.1 Change in channel sinuosity for project subreaches, 1939-1996...................39
Figure 6.2 Change in channel width for project subreaches, 1939-1996.................,........39
Figure 6.3 Measured bankline migration rates, Arkansas River project reach................ 42
Figure 6.4 Measured bendway cutoff radius of curvature/width ratios, Arkansas River

project reach.. ............. ....... ........ ...... .....,... .... ... ... ,.. .......... ........... .... ,....... ...... .... ......... 42
Figure 6.5 Number of days measured flows exceeded effective discharge: Arkansas
River at Malta..... ........,.. .... ..... ......... ........ .....,..... ,. ,.. ..... ... ..... ,..... ............. ,............ ..., 45

May 7, 1999

Fluvial Geomorphological Assessment
Upper Arkansas River

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