Abstract

The conventional practices of urbanization, land use strategies and stormwater management are considerably increasing the risk of wet weather flooding, downstream erosion and water pollution. To minimize the water pollution problem associated with the urban development various concepts of low impact development are being implemented. The city of Toronto has installed an underground bioretention system at Queensway Avenue. The hydraulic design criteria and specification of the underground bioretention system are not yet well developed. Hydraulic design model is developed using five mass balance equations of the five components of bioretention system. All design water depth variables of the bioretention system are solved simultaneously using Matlab program. An application of the model in Toronto is included to illustrate the design of the underground bioretention system.

Highlights

  • The conventional practices of urbanization, land use strategies and stormwater management are considerably increasing the risk of wet weather flooding, downstream erosion and water pollution

  • Best Management Practice (BMP) is a combination of practices that is an effective and practicable means of preventing or reducing the amount of pollution generated by non-point sources

  • Model results indicated that there is no overflow in any of the component in bioretention system. 5.2.3 Pipe Diameter To determine the right size of distribution pipe, diameter is reduced from 0.15m to 0.10 m, and run the model

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Summary

Background

The conventional practices of urbanization, land use strategies and stormwater management are considerably increasing the risk of wet weather flooding, downstream erosion and water pollution. The Natural Resources Defense Council (Kloss and Calarusse 2006) describes similar impacts attributed to conventional controls across the U.S Storm sewers collect and discharge treated runoff to water bodies, while combined sewer and stormwater systems overflow during heavy rains, discharging both untreated sewage and stormwater into rivers and lakes. Both contribute to impaired water quality, flooding, habitat degradation, and stream bank erosion. Developing and implementing stormwater management programs and urban-runoff controls will cost an additional $11 to $22 billion (Kloss and Calarusse 2006). LID introduces redevelopment projects and builds on conventional design strategies by exploiting every surface in the infrastructures to perform a beneficial hydrologic function

Problem Identification
Purpose
Chapter II LITERATURE REVIEW
Best Management Practices (BMP)
Low Impact
Infiltration Processes
Definition of Bioretention
Design of Bioretention System
Allowable Ponding Depth
Dimension of Bioretention System
Bioretention Soil and Depth
2.10 Design of Bioretention System as an Infiltration Practice
Development of A Hydraulic Design Model
Flow in Upper Distribution Pipe (P1)
Model Criteria
Mass Balance at Catch Basin
Mass Balance at Distribution Pipe
Mass Balance at the Bioretention Cell
Upper Distribution Pipe (P1)
Runoff Diversion Capacity of the Bioretention System
Hydraulics of Bioretention System
Model Response due to Change of Rainfall Intensity
Chapter V
Present Model Work
Catch Basin
Distribution Pipe
Size of Underground Bioretention System
Exercise of the Model
Step by Step Procedure Step-1 Required data for the model: i
Model Results
Chapter VI
Matlab Program for Numerical Model of Bioretention System clc clear all format long g
Full Text
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