FLOOD07093

• County: Otero
• County: Pueblo
• Community: Otero, Pueblo Counties
• Stream Name: Arkansas River
• Basin: Arkansas
• Title: Arkansas River Channel Capacity and Riparian Habitat Planning Study
• Date: 8/1/2001
• Prepared For: CWCB
• Prepared By: US Army Corps of Engineers
• Floodplain - Doc Type: Project

APPENDICES

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A. Flood History and Damages: Chapters 1 - 4 and reference section (pages 45-48) of the
report entitled Post Flood Assessment Report, Arkansas River, Southern Colorado and dated
September 15,1999.

B. CWCB/USGS Groundwater Investigation: The CWCB will prepare a summary report of
the CWCB/USGS Groundwater Investigation. The CWCB/USGS Report is also appended for
reference

C. 1999 La Junta/North La Junta PL-99 Report;

Table 1-1.
Table 2-1.

Table 3-1.
Table 3-2.
Table 3-3.
Table 3-4.
Table 3-5.
Table 3-6.
Table 3-7.

LIST OF TABLES

Problem areas defined in this study............................................................... 3
Annual Peak Discharges per calendar year at USGS stream gages on
the Arkansas River above John Martin Dam, 1942 to 1999.......................... 7

Stream Gages. ..... ...... ........ ............... ............. ............ ......... ............. ......... ....... 26
Discharge Frequency Peaks............................................................................ 28
Correlation (R2 values) of discharge versus suspended sediment................. 29
Manning's roughness values .......................................................................... 31
Existing sediment transport rates................................................................... 32
In-channel sediment transport rates ............................................................... 32
Improved channel template sedimentation results......................................... 33

LIST OF FIGURES

Figure 1. General Study Area: Arkansas River Upper Reach, between Pueblo/Otero County
Line and John Martin Reservoir, Otero and Bent Counties, Colorado ............ ............... 3

Figure 2. Area View of Problem Areas, Upper Reach, between PueblolOtero County Line and
John Martin Reservoir, Otero and Bent Counties, Colorado ..... ...... ......................... 4

Figure 3. Bed gradations, Arkansas River and tributaries near Lamar, Colorado, ......... 25
April 1997.

Figure 4. Historic measured suspended sediment. .......................................... ........... ....30

Figure 5. Improved channel template results. .................................................. ..............34

Figure 6: PZF Estimates. .............................................................................. ......... ...... 36

LIST OF PLATES

Plate 1. Discharge Rating Curve at La Junta. ................................................ ............... 27

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