FLOOD07436

• County: Statewide
• Basin: Statewide
• Title: Arkansas River from John Martin Dam to the Colorado-Kansas State Line: Channel Capacity and Riparian Planning Study
• Date: 7/1/1999
• Prepared For: CWCB
• Prepared By: US Army Corps of Engineers
• Floodplain - Doc Type: Floodplain Report/Masterplan

Table 1-1.
Table 2-1.

Table 3-1.
Table 3-2.
Table 3-3.
Table 4-1.
Table 4-2.

Table 4-3.

Table 4-4.

Table 4-5.
Table 4-6.

Table 4-7.

LIST OF TABLES

Problem areas defmed in this study. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Largest mean daily discharges per calendar year at USGS stream gages on
the Arkansas River above and below Jo1m Martin Dam, 1942 to 1999 . . 4
Correlation (R2 values) of discharge versus suspended sediment.. . . . . .. 14
Manning's rouglmess values .................................... 17
Existing yield summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 24
Improved channel yield summary, Channel Improvement alternative. . .. 33
Approximate earthwork costs of for the Channel Improvement

alternative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 34
Pre- and post-project area of river channel and riparian overbank for
the Channel Improvement alternative ........................... 35
Approximate earthwork costs for the Limited Channel Improvement

alternative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 36
Agricultural areas at risk to inundation at 3,000 cfs .................. 37
Approximate earthwork volumes, Structural Floodway Improvement

alternative. ................................................ 38
Gross cost estimates for a 50Q-acre riparian restoration project .. . . . . . .. 44

LIST OF FIGURES

Figure 1. Study area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Figure 2. Arkansas River discharge, April through November, 1985 ............... 6
Figure 3. Arkansas River discharge, April through November, 1987 ... . . . . . . . . . . . . 7
Figure 4. Arkansas River discharge, April through November, 1995 . . . . . . . . . . . . . . . 8
Figure 5. Arkansas River discharge, April through June 15, 1999 ................. 9
Figure 6. Discharge duration curves ........................................ 13
Figure 7. Examples of agricultural encroachment... . '" ... .. . .. .... ...... . . . .. 22

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