BOUTOT BROOK CROSSING: CULVERT REPLACEMENT
Fredericton
BoutotBrook
N.B.
Taylor Braye ∙ Alison Collicutt ∙ Kiera Dolan ∙ Kathryn Esligar ∙ Philippe HamelClient: Lindon Miller, NBDTI
F.L.O.W.Consulting
Problem Statement
NBDTI is concerned there is a risk of a washout of the Boutot Brook No.1 twinbox culvert within its expected service life, and subsequently the West RiverRoad and the NB Trail, in Argosy, NB. The existing culvert periodically getsobstructed with accumulating sediment and must be regularly cleared out,resulting in annual maintenance costs ranging from $40,000 to $50,000. Theheavy sediment flow blocks fish passage baffles and is abrasive to the concrete,exposing reinforcement.
Objective
To replace existing twin box culvert with an open-bottom concrete arch culvert to convey water from Boutot Brook to the Saint John River and to allow improved bed load passage through the structure.
Project Scope
• Considered alternatives• Hydraulic analysis• Scour analysis• Foundation design• Structural capacity
• Culvert profile• Embankment design• Debris protection• Cost analysis• Sustainability assessment
Hydraulic Assessment
• Drainage area:20.75 km2
• Design flow:43.75 m3/s
Sustainability Assessment
• Silver Envision rating• Fish passage provided
Cost Estimate
• Total costs: $2,801,000• Life cycle costs: $385,000
Structural Design
• 29 prefabricated BEBO arch sections: C36T/9• Material: reinforced concrete• Span: 10.97 m• Rise: 7.11 m
Foundation Design
• Cross-section: 3 m x 0.9 m• Scour depth: 0.30 m• Frost depth: 1.6 m• 18-20M continuous & 25M @ 200 mm transverse reinforcement
Profile Design
• Length: 52.66 m• Slope: 3% (to match natural streambed slope)• End treatments: wing walls and spandrel walls
$214,000
$186,000
$1,819,000
$267,000
$255,000
Removal of culvert
Site prep
Structure
Road & embankment
Non-construction
Outlet
Inlet
3D Model
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PRODUCED BY AN AUTODESK STUDENT VERSION
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