p r o d u c e d b y a n a u t o d e s k s t u d e n ... - unb

BOUTOT BROOK CROSSING : CULVERT REPLACEMENT Fredericton Boutot Brook N.B. Taylor Braye ∙ Alison Collicutt ∙ Kiera Dolan ∙ Kathryn Esligar ∙ Philippe Hamel Client: 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 twin box culvert within its expected service life, and subsequently the West River Road and the NB Trail, in Argosy, NB. The existing culvert periodically gets obstructed with accumulating sediment and must be regularly cleared out, resulting in annual maintenance costs ranging from $40,000 to $50,000. The heavy 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 km 2 • Design flow: 43.75 m 3 /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

Upload: others

Post on 04-Oct-2021

0 views

Category:

Documents

0 download

Report

Download

Embed Size (px):

TRANSCRIPT

Page 1: P R O D U C E D B Y A N A U T O D E S K S T U D E N ... - UNB

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