1. Is It Stable Yet? A Lessons Learned Approach to Predicting Long Term Stable Channel Slopes 2009 CASFM Conference Crested Butte, CO. September 16 – 18, 2009 Alan Turner P.E., CFM, CH2M HILL J. David Van Dellen, P.E., CFM, Town of Castle Rock Pieter Van Ry, P.E., CFM, Town of Castle Rock Mark Glidden, P.E., CH2M HILL

8. Required Data

11. Permissible Velocity Values * Fortier and Scobey (1926) ** Known et all (1977) *** SCS (1954) and UDFCD (2006) 6.8 6.0 5.5 5.3 5.0 3.8 SC Hilly gravelly land and pits gravel and Stony rough land Hg, GP, Su Graded Loam to Cobbles 6.8 4.9 4.6 3.9 2.5 - 3.5 1.75 - 2.0 SC Peyton Pring Crowfoot and Kutch Sandy Loams and Complex PpE, PrE2, KtE Sandy Loam 6.8 4.9 4.6 3.9 3.5 - 5 2.0 - 3.8 CL Loamy Alluvial Land, Sandy wet Alluvial Land, and Sampson Loam Lo, Lu, SE, Sd, Se, St Alluvial Silt 6.8 6.0 5.5 5.3 5.0 3.4 CL Kutch Clay Loam, Jarre Brusset and Fondis Kutch Association, Fondis Clay Loam and Pits Clay KuD, Jb, Fu, CP, FoD Stiff Clay 6.8 4.9 4.6 3.9 2.7 - 3.5 1.7 - 2.5 SC-SM Bresser, Bresser Truckton, Crawfoot Tomah, and Newlin Sandy Loams BrD, Bte, BrB Cre, NeE Ordinary Firm Loam Grass Lined *** Flow Depth 8 to 10 feet** Flow Depth 5 to 8 feet** Flow Depth 3 to 5 feet** Water Transporting Colloidal Silt* Clear Water* USCS NRCS Soil Description NRCS Soil Type Applied Permissible Velocities (fps) Soil Types within Study Area Soil Description Fortier and Scobey (1926)

12. Revised Permissible Velocity Results 0.041 Clay, Sandy Loams 4 Westfield 0.012 Firm Loams 2,3 Westfield 0.006 Firms Loams, Silt 1 Westfield 0.018 Firm Loams, Sandy Loams, Gravel 4,5,IT1 Industrial 0.004 Firm Loams 1,2,3 Industrial 0.013 Clay, Firm Loams, Sandy Loams 1,2 Tributary to Omni 0.015 Sandy Loams, Clay 6 Omni 0.010 Firm Loams 3,4,5 Omni 0.004 Alluvial Silt, Firm Loams 1,2 Omni Stable Slope (ft/ft) Soil Type Reaches Tributary 0.020 Stiff Clay, Firm Loams, Sandy Loams 6.7 South Dawson 0.007 Firm Loams 1,2,3,4,5 South Dawson 0.004 Alluvial Silt, Firm Loams 1,2,3 North Dawson Stable Slope (ft/ft) Soil Type Reaches Tributary

13. Revised Permissible Velocity Results 0.018 0.018 Gravel 0.041 0.013 Clay 0.041 0.013 Sandy Loams 0.02 0.004 Firm Loams 0.006 0.004 Alluvial Silt Maximum Slope Ft/ft Minimum Slope ft/ft Soil Type

14. Revised Permissible Velocity Reality Check

16. 6400 Tributary Master Plan Results 0 0.004 Stony Rough Land 0.041 Reach 4 6400 West Tributary 9 0.004 Renohill-Manzanola Clay Loams 0.053 Reach 3 6400 West Tributary 13 0.004 Loamy Alluvial Land 0.041 Reach 2 6400 West Tributary 4 0.004 Loamy Alluvial Land 0.037 Reach 1 6400 West Tributary 0 0.004 Stony Rough Land 0.049 Reach 7 6400 East Tributary 9 0.004 Fondis-Kutch Association 0.059 Reach 6 6400 East Tributary 0 0.004 Loamy Alluvial Land 0.053 Reach 5 6400 East Tributary 6 0.004 Loamy Alluvial Land 0.058 Reach 4 6400 East Tributary 0 0.004 Loamy Alluvial Land 0.029 Reach 3 6400 East Tributary 2 0.004 Loamy Alluvial Land 0.036 Reach 2 6400 East Tributary 2 0.004 Loamy Alluvial Land 0.033 Reach 1 6400 East Tributary 0 0.004 Fondis-Kutch Association 0.059 Reach 5 6400 South Tributary 7 0.004 Loamy Alluvial Land 0.050 Reach 4 6400 South Tributary 12 0.004 Bresser Sandy Loam 0.056 Reach 3 6400 South Tributary 0 0.004 Englewood Clay Loam 0.039 Reach 2 6400 South Tributary 9 0.004 Newlin Gravely Sandy Loam 0.028 Reach 1 6400 South Tributary Required Drops Master Plan Slope ft/ft Soil Type Existing Slope ft/ft Reach Stream

17. 6400 Tributary Revised Permissible Velocity 0 0.041 Stony Rough Land 0.041 Reach 4 6400 West Tributary 0 0.053 Renohill-Manzanola Clay Loams 0.053 Reach 3 6400 West Tributary 11 0.009 Loamy Alluvial Land 0.041 Reach 2 6400 West Tributary 2 0.007 Loamy Alluvial Land 0.037 Reach 1 6400 West Tributary 0 0.05 Stony Rough Land 0.049 Reach 7 6400 East Tributary 5 0.037 Fondis-Kutch Association 0.059 Reach 6 6400 East Tributary 0 0.007 Loamy Alluvial Land 0.053 Reach 5 6400 East Tributary 5 0.005 Loamy Alluvial Land 0.058 Reach 4 6400 East Tributary 0 0.005 Loamy Alluvial Land 0.029 Reach 3 6400 East Tributary 1 0.005 Loamy Alluvial Land 0.036 Reach 2 6400 East Tributary 2 0.004 Loamy Alluvial Land 0.033 Reach 1 6400 East Tributary 0 0.02 Fondis-Kutch Association 0.059 Reach 5 6400 South Tributary 5 0.009 Loamy Alluvial Land 0.050 Reach 4 6400 South Tributary 11 0.005 Bresser Sandy Loam 0.056 Reach 3 6400 South Tributary 0 0.006 Englewood Clay Loam 0.039 Reach 2 6400 South Tributary 9 0.004 Newlin Gravely Sandy Loam 0.028 Reach 1 6400 South Tributary Required Drops Permissible Velocity Slope ft/ft Soil Type Existing Slope ft/ft Reach Stream

25. Questions?