Stream Simulation Design Process - USDA Forest Service

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Example of structure type hydraulic differences, 4% gradient 12’ bank full width, 2’ bank full height, Q2=12-cfs, Q100=300cfs (shifts are more dramatic at lower gradients) STRUCTURE SHAPE Rectangular Concrete box 1/2 round arch or embedded pipe Low profile arch DIMENSIONS 12’ wide x 6’ high 12’ wide x 6’ high 12’ wide x 4’-1/2” high Q2 INLET DEPTH 2.2’ 2.6’ 2.8’ Q100 INLET DEPTH 4.1’ 5.1’ 6.7’
High and Low Profile Structures Low fill = low profile structure = ($) Embedded pipe arch Aluminum box with aluminum footings We don’t like multiple pipes to cross channel for a couple of reasons: velocity, scour at outlet, sediment trap, velocity, flood capacity
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: Structure shape versus channel shap
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 and 54: The minimum adequate structural thi
Page 55 and 56: Foundation Conditions and Slope Sta
Page 57 and 58: Bearing Capacity & failure modes pi
Page 59 and 60: Footing Shapes for Open Bottom Arch

Stream Simulation Design Process - USDA Forest Service

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