FLOOD02750

• Document ID: 125
• County: Routt
• Stream Name: Elk River
• Basin: Yampa/White
• Water Division: 6
• Title: Streambank Stabilization Limited Watershed
• Date: 11/1/1999
• Prepared For: CWCB
• Prepared By: ICON Engineering, Inc.
• Watershed Pro - Doc Type: Educational/Technical/Reference Information

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TABLES AND FIGURES

LIST OF TABLES
Table 2,1 - Flood Hydrology Discharges...............................,.................... 5
Table 2,2 - Elk River Watershed Drainage Areas..,.,................................., 7
Table 2,3 - Estimation of Water Content Above Steamboat Lake.............. 8
Table 3, I - Elk River and West Fork Discharge Distributions ..........,...... 17
Table 3,2 - High Water Mark Data ..................,........................................17
Table 3.3 - Summary of Hydraulic Analysis Results.........,...................... 19
Table 5.1 - Riprap Gradation (MaybeIl Enterprises) ................................35
Table 5.2 - Unit Cost Summary ......................,................................,........40
Table 5.3 - Conceptual Alternative Cost Estimates ..,..............................40

LIST OF FIGURES
Figure 1.1 - Vicinity Map ..,........................................................................2
Figure 1,2 - Property Ownership Information .........................,................., 3
Figure 2.1 - Watershed Map .......................................................................6
Figure 2.2 - 1997 Seasonal RunoffHydrograph......,..........,.....,...............lO
Figure 2.3 - 1998 Seasonal Runoff Hydrograph ....................................... I I
Figure 3.1 - Cross-section Location Map..................,...............................14
Figure 3,2 - Composite Rating Curve Sections.......,.........................,....... 16
Figure 3.3 - Elk River - High Water Mark Comparison with 1997 Water

Surface Profile"".,.,..",.,..",....,.""."."",..,..,.""...." ....",.,.,.".. 18
Figure 3.4 - Elk River - IOO-year Water Surface Profile .....,.....,...........,.21
Figure 4.1 - Field Assessment..........,....................................,...................26
Figure 5,1 - Preformed Boulder Grade Control...............................,........31
Figure 5,2 - Riprap Grade Control.........,.....................................,.....,.....,32
Figure 5,3 - Riprap Armor with Launched Toe Protection,.....................,34
Figure 5.4 - 100-year Comprehensive Improvements ....,.........................36
Figure 5,5 - IOO-year Minimum Improvements....................................,... 37
Figure 5,6 - Minimum Improvements..........,.......................,....................38