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<br />I I <br />I TABLE OF CONTENTS (continued) I <br /> Page <br />I VI. ALTERNATE IMPROVEMENT PLANS I <br /> General Considerations . 58 <br />I Improvement Alternatives 60 I <br /> Conceptual Designs 61 <br />I Alternative 1 61 I <br /> Alternative 2 61 <br /> Alternative 3 67 <br />I VII. IMPROVEMENT COSTS 69 I <br /> VIII. ECONOMIC ANALYSIS 87 <br />I X. PLAN FORMULATION I <br />I Plan Selection 91 I <br /> Preliminary Design 93 <br /> Plan Implementation 93 <br />I XI. REFERENCES . . . . . 94 I <br />I I <br />I I <br />I I <br />I I <br />I I <br />I I <br />I I <br />I I <br />I viii I <br />I I <br /> <br />LIST OF TABLES <br /> <br />Table 1. <br /> <br />Percent of One-Hour Rainfall Depth for Five-Minute <br />Intervals .. ... .... .... .. .. .. .. .. .. .. .. <br /> <br />Rainfall Depths in Inches for 60-Minute Duration, <br />Fort Collins Area . . . <br /> <br />Table 2. <br />Table 3. <br />Table 4. <br />Table 5. <br />Table 6. <br />Table 7. <br /> <br />Boxelder Creek Rainfall Intensities (Inches Per Hour) <br /> <br />Cooper Slough Rainfall Intensities (Inches Per Hour) <br /> <br />Percent Impervious for Fully Developed Zoning Conditions <br /> <br />Drainage Basin Parameters for SWMM <br /> <br />Summary of Peak Flows in cfs for Cooper Slough for <br />Existing and Developed Conditions With Existing Channel <br /> <br />Table 8. Summary of Peak Flows in cfs for Boxelder Creek <br />Table 9. Manning's Roughness Coefficients <br />Table 10. Flow Split Data for Boxelder Creek <br />Table 11. Flow Split Data Cooper Slough . . . <br />Table 12. Flood Elevation Data, Boxelder Creek <br /> <br />Table 13. <br /> <br />Flood Elevation Data, Cooper Slough - Existing <br />Conditions . . . . . .. .... <br /> <br />Table 14. Flood Elevation Data, Cooper Slough Developed Conditions <br />Table 15. Bridge and Culert Data <br />Table 16. Cooper Slough Floodway Table <br />Table 17. Boxelder Creek Floodway Table <br />Table 18. Flood Oamage Factors . . . <br />Table 19. Flood Damage Summary Cooper Slough <br />Table 20. Flood Damage Summary Boxelder Creek <br />Table 21. ' Average Annual Flood Damages <br /> <br />ix <br /> <br />Page <br /> <br />15 <br /> <br />16 <br /> <br />17 <br /> <br />18 <br /> <br />20 <br /> <br />22 <br /> <br />23 <br /> <br />25 <br /> <br />33 <br /> <br />33 <br /> <br />34 <br /> <br />36 <br /> <br />39 <br /> <br />40 <br /> <br />41 <br /> <br />42 <br /> <br />44 <br /> <br />52 <br /> <br />53 <br /> <br />54 <br /> <br />57 <br />