Stream Simulation Design Process - USDA Forest Service

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Know your traffic needs! Bypass roads – adding later may require structure modification, $$$ So Plan Ahead, NEPA, fire access, recreation • By pass roads are most suitable for <strong>Forest</strong> roads or Country roads where land is available for temporary construction & public traffic use. • Highway designs often require 24/7 traffic. •No bypass road but maintaining traffic usually requires construction of a long structure and the use of retaining wall to separate construction elevation from traffic elevation.
Foundation Conditions and Slope Stability Considerations • Strength estimates for soil and rock units for design of foundations. –Rock to rock contact vs. • Sand (gradation dependant) • Can be problematic – Need a specialist to design footings and embedded pipe when settlement would cause problems (asphalt roads) • Slopes - <strong>Design</strong> excavation slopes when AASHTO is too conservative. Do you use AASHTO Guidelines • Dewatering is the key to getting good working conditions and a dryer foundation area.
Page 1 and 2:
Stream Simulation Design Process As
Page 3 and 4: Stream Simulation How big is it?
Page 5 and 6: Culvert Size 1. Based on Project Ob
Page 7 and 8: Bed profile elevation; average of m
Page 9 and 10: Stream Simulation - gentle gradient
Page 11 and 12: Stream Simulation culvert width •
Page 13 and 14: Stream Simulation culvert width b.
Page 15 and 16: Design for sustainability, especial
Page 17 and 18: The same stream simulation can usua
Page 19 and 20: Pipes • Maximum embedment = where
Page 21 and 22: Barnard
Page 23 and 24: Box Standard Arch Arches (embedment
Page 25 and 26: Bankfull width structure after 16 y
Page 27 and 28: Bridge Structures Wood: Glue lamina
Page 29 and 30: Bridges are beautiful, but don’t
Page 31 and 32: A Much Better Bridge Nice! Hey, aqu
Page 33 and 34: Geometry & Fit Considerations • R
Page 35 and 36: Structure shape versus channel shap
Page 37 and 38: Structure shape versus channel shap
Page 39 and 40: High and Low Profile Structures Low
Page 41 and 42: Bottomless Arch Miscellaneous Place
Page 43 and 44: COSTS $160,000 $140,000 $120,000 $1
Page 45 and 46: Changing from 8’ open bottom arch
Page 47 and 48: Durability - Abrasion Abrasion rate
Page 49 and 50: “Normal” Corrosion & Abrasion i
Page 51 and 52: 1. For 16 gage galvanized steel, th
Page 53: The minimum adequate structural thi
Page 57 and 58: Bearing Capacity & failure modes pi
Page 59 and 60: Footing Shapes for Open Bottom Arch
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Stream Simulation Design Process - USDA Forest Service

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