PERMFILE64638

• Permit No: C1981071
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: GEOMORPHIC & ENGINEERING ANALYSIS OF COLO YAMPA COAL CO ECKMAN PARK MINE FINAL REPORT
• Media Type: D
• Archive: No

Table of Contents
•
Title Page
List of Figures .................................................. ii
List of Tables ................................................... iii
List of Maps ..................................................... iv
EXECUTIVE SUMMARY ................................................ v
1. INTRODUCTION ................................................. 1
1.1. Statement of the Problem ............................... 1
1.2. Objectives ............................................. 3
1.3. Procedure and Analysis ................................. 3
2. GEOMORPHIC ANALYSIS .......................................... 5
2.1. Description of Mine Area ............................... 5
2.2. Determination of Approximate Original Contour.......... 6
2.2.1. Slope Analysis ................................. 6
2.2.2. Hypsometric Curves ............................. 8
2.2.3. Drainage Density Analysis ...................... 14
2.2.4. Natural Variations in Dip Slope Topography..... 15
2.3. Geomorphic Stability Comparison ........................ 17
2.3.1. Natural Hillslope Gradient ..................... 17
2.3.2. Area Gradient Index ............................ 21
2.4. Discussion ............................................. 23
3. ENGINEERING ANALYSES ......................................... 28
3.1. Data Collection and Review ............................. 28
3.2. Hydrology and Hydraulic calculations ................... 29
3.3. Channel Stability Comparison ........................... 33
3.4. Mitigation Alternatives ................................ 38
4. CONCLUSIONS AND RECOMMENDATIONS .............................. 39
4.1. Specific Conclusions ................................... 39
References ....................................................... 41
Appendix ......................................................... A-1

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