2. Background/Constraints  Site located in Casey County Kentucky  Low volume skidder road  Design must be modular, able to be transported by small truck and trailer, assembled on site, able to withstand logging traffic, and survive a 25 year return storm.  Must be cost effective for the design’s lifespan.

3. Soil Data  Garmon silt-loam, with 20% porosity  Bedrock 28”-38” below surface  Dry density ρ=94 lb/ft^3  Saturated density ρ=106.5 lb/ft^3  Angle of internal friction 25˚-35˚

4. Hydrology (Win TR-55)

7. Win TR-55 Results Time of Concentration (Win TR-55) Sheet Shallow ConcentrateChannel Length100 450 Slope10%20%17.60% Mannings0.80.60.1 Time (hr)0.3180.0040.054 Total Tc (hr) 0.376 Total Tc (min) Peak Flow (25 year storm) 22.56 3.62 cfs

8. Rational Method Rational Method (Q=ciA) c 0.25 i 4.7in/hr A 3.3ac Tc 22.62min Q (cfs) 3.9cfs

9. Geotechnical Forces Soil density saturated: ρ = 106.56 Weight of skidder: w = 47,500 lb Tire footprint of tire: A = 3.75 ft^2 Point load on each tire: 3,167 lb/ft^2 Vertical force at bottom of wall: 4,127 lb Horizontal force at bottom of wall: 1,150 lb Total force on wall: 9,070 lb or 126 lb/ft^2 Design strength of wall: 43,000 lb or 600 lb/ft^2

10. Mohr’s Circle

11. Design Layout View

12. Design Profile View

13. Design Plan View

14. Cost (Materials) Material Cost MaterialQuantityItem CostSub-TotalTax (9%)Total Reclaimed Cross-ties (7"x9"x8')24$13.97$335.28$30.18$365.46 Reclaimed Utility Pole (Class C, 15'x10")8$45.00$360.00$32.40$392.40 8" TimberLok wood screw (50 per box)2$36.55$73.10$6.58$79.68 A307 3/4"x14" Lag Screw24$103.97 $9.36$113.33 Total Materials Cost $950.86

15. Cost (Installation/Total) Installation Cost CAT Mini Excavator Rental$219.21 Refuel Cost (6 gallon@ $2.50/gal)$15.00 Labor Cost$200.00 Total Installation Cost$434.21 Total Materials Cost$950.86 Total Overall Cost$1,385.07

16. Conclusions  Design meets all requirements. i.e. Modular, can be assembled on site…ect  Longevity of life warrants cost of $55.40 per year of its 25 year life span.  Based on TR-55 and rational method calculations, the current 36” pipe will provide adequate flow.

17. Questions?