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Cost Effective Drainage Structures

Cost Effective Drainage Structures

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Cost Effective Drainage Structures

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  1. Cost Effective Drainage Structures Henry J. “Hank” Gottschalk, III Technical Resources Engineer Virginia Concrete Conference March 2010

  2. Financial Assessment of Drainage Structure • Cost of supply

  3. Bridge Systems

  4. Culverts

  5. Pipes

  6. Drainage Inlets

  7. Our only limitation is our customers’ imagination.

  8. Conduit Structure Horizontal Structures

  9. Purpose of vertical structure • Connect pipes

  10. Purpose of vertical structure • Connect pipes • Provide access

  11. Purpose of vertical structure • Connect pipes • Provide access ASCE Photo Contest

  12. Purpose of vertical structure • Connect pipes • Provide access

  13. Shape

  14. Round Vertical Structure

  15. As = 0.0025 x D(in) Round Vertical Structure

  16. Round Vertical Structure

  17. Rectangular Vertical Structure

  18. Rectangular Vertical Structure

  19. Rectangular Vertical Structure

  20. Rectangular Vertical Structure

  21. Financial Assessment of Drainage Structure • Cost of supply • Cost of proper installation & inspection

  22. Highway Congestion • Congestion robs our nation of productivity and quality of life • 3.5 billion hours/year time delay • 5.7 billion gallons of wasted gas/year • Total cost of $75 billion for the 75 urban areas 2010 FHWA Presentation - Reggie Holt, Sr. Bridge Engineer

  23. Work Zone Safety • Continued need for Accelerated Construction and methods to close fewer lanes TRB DCG Critical & Cross Cutting Issues, 01-14-11

  24. Work Zone Safety • As many as 1000 fatalities occur each year in roadway construction work zones TRB DCG Critical & Cross Cutting Issues, 01-14-11

  25. Financial Assessment of Drainage Structure • Cost of supply • Cost of proper installation & inspection

  26. Financial Assessment of Drainage Structure • Cost of supply • Cost of proper installation & inspection • Maintenance

  27. Financial Assessment of Drainage Structure • Cost of supply • Cost of proper installation & inspection • Maintenance • Service Life versus Project Life

  28. U.S. Army Corps of EngineersNo. 1110-2-2902 Engineering and DesignConduits, Culverts, and Pipes (31 March 1998) • CONCRETE- Most studies estimated product service life for concrete pipe to be between 70 and 100 years.Of nine state highway departments, three listed the life as 100 years, five states stated between 70 and 100 years, and one state gave 50 years. • (2) STEEL - Corrugated steel pipe usually fails due to corrosion of the invert or the exterior of the pipe.Properly applied coatings can extend the product life to at least 50 years for most environments. • (3) ALUMINUM- Aluminum pipe is usually affected more by soil-side corrosion than by corrosion of the invert. Long-term performance is difficult to predict because of a relatively short history of use, but the designer should not expect a product service life of greater than 50 years. • (4) PLASTIC- Many different materials fall under the general category of plastic. Each of these materials may have some unique applications where it is suitable or unsuitable. Performance history of plastic pipe is limited. A designer should not expect a product service life of greater than 50 years. Excerpt from Para. 1-4 Life Cycle Design

  29. Risk Assessment

  30. Risk Assessment • Modes of Failure

  31. Road Closed but they’re Open for Business

  32. The Economic Cost of Culvert Failure

  33. User Delay Costs (Indirect Costs) Joseph Perrin’s Research: D = AADT * t * d *(cv * vv * vof + cf * vf) Where: AADT = Annual Average Daily Traffic of the roadway which the culvert is being installedt = the average increase in delay or congestion the installation is causing to each vehicle per day, in hoursd = the number of days the project will takecv = the average rate of person-delay, in dollars per hour vv = the percentage of passenger vehicles traffic vof = the vehicle occupancy factor cf = the average rate of freight-delay, in dollars per hourvf = the percentage of truck traffic

  34. User Delay Costs (Indirect Costs) Average Established Delay Costs as of 2005, in Dollars: cv = $18.62 per person / hour of delay cf = $52.86 per freight /hour of delay Typical Traffic Assumptions: vv = 97% vehicle passenger traffic vf = 3% truck traffic vof =1.2 persons per vehicle A one-hour delay on a roadway carrying an Annual Average Daily Traffic of 20,000 vehicles costs the public over $450,000 every day.

  35. Risk Assessment • Modes of Failure

  36. Financial Assessment of Drainage Structure • Cost of supply • Cost of proper installation & inspection • Maintenance • Service Life versus Project Life

  37. It is unwise to pay too much, but it is worse to pay too little. When you pay too much, you lose a little money. When you pay too little, you sometimes lose everything, because the thing you bought was incapable of doing the thing it was bought to do. JOHN RUSKIN 1819-1900, renowned English critic, social commentator, and economist of the Victorian Age

  38. Advantages ofPrecast Concrete Structures Cast and Cured in a Quality Controlled Environment Shows up at the Jobsite as a Structure Strength is All Ready “Built In” Just Set, Connect… and Go! Save Time & Money! Precast Concrete = Long Service Life