Comprehensive Review of Drainage Design Methods for Culvert, Open Channel and Storm Sewer Design

After participating in this course, you will be able to:

• Analyze and apply critical design factors for the planning and development of drainage systems.

• Identify and choose the most appropriate software for urban drainage design applications.

• Confidently evaluate drainage designs and apply calculation methods.

• Implement effective design methodologies for urban drainage projects using industry standards.

• Assess and mitigate the impacts of urbanization on stormwater and open channel drainage systems.

Description
Urban growth and changing land use patterns present significant challenges for drainage engineers tasked with managing stormwater, runoff, and open channel flows. Effective drainage design is essential to prevent flooding, minimize erosion, and manage water quality in urban environments. Understanding the complexities of stormwater management, rainfall analyses, and time of concentration equations is crucial for ensuring efficient and reliable drainage systems.

Participants in this course will gain an in-depth understanding of the principles and methodologies used in drainage and stormwater design. Topics such as culvert design, open channel flow, storm sewer design, and bridge opening considerations will be covered extensively. The course focuses on rainfall loss computations, flow estimation for drainage design, and workshops that guide participants through real-world scenarios and case studies.

Attendees will also become proficient in using specialized drainage design software to analyze and simulate stormwater systems. The course is designed to equip engineers and designers with the tools necessary to handle the growing challenges of urban stormwater management. Through software tools and interactive sessions, it offers both theoretical knowledge and practical applications. By the end of the course, participants will be ready to apply these methodologies directly to their ongoing projects.

Who Should Attend
This course is designed for municipal engineers, civil engineers, environmental engineers, planners, project managers, and designers involved in stormwater management and drainage system design. Technicians, technologists, and hydraulic engineers seeking to enhance their knowledge of open channels, storm sewers, and culvert design will also benefit.

Professionals working on infrastructure projects in urban environments or those responsible for water resource management are encouraged to attend. Engineers looking to update their stormwater analysis and drainage software skills will find this course especially valuable.

Welcome, Introduction, Course Preview, Learning Outcomes and the Assessment Method

Basic Hydrology – Refresher and Workshop

Introduction

• Review of drainage concepts and needs

• Stormwater design criteria and level of service

• Urban and rural drainage systems

• Minor and major systems in urban drainage

Rainfall Analyses

• Design storms or floods-how to cope with lack of long and reliable data sets

• Storm frequencies-the danger of extrapolation

• Intensity-Duration-Frequency (IDF) data

• Historical storms

• Storm distribution in time

Drainage and Stormwater Design Criteria

• Flood control risks, liability and the unknown effect of climate change

• Water quality control

• Erosion control

Time of Concentration –Review of Design Equations, Charts and Their Limitations

• Bransby Williams equation

• Kirpich equation

• Airport formula

Methods of Computing Rainfall Losses

• Use of runoff coefficients

• SCS curve number method

• Horton infiltration method

Estimating Flows in Drainage Design

• Use of Rational Method for estimating design discharge

• Use of Statistical analyses of observed data to estimate design discharge

• Use of computer models for estimating design discharge

Day 1 Workshop

• Examples and Case Studies for Flow Estimations (Rational Method, Statistical Analysis, Computer Modeling)

Day II

Basic Hydraulics-Refresher

Open Channel Flow

• Basic laws of hydraulics

• Types of flows

• Manning's equation

• Roughness coefficients

• Stream erosion and threshold velocities

• Effect of urbanization on stream hydraulics

Design of Open Channels

• Manning’s equation for channel design

• Stable channels

• Composite channels

• Triangular channels and gutters

Design of Storm Sewers

• Major-minor system design

• Stormwater collection and inlets

• Gravity flow sewers

• Hydraulic losses

• Surcharged and flooding conditions

• Shallow and steep slope systems

• The simple spreadsheet design approach

Design of Culverts and Bridge Openings

• Culverts, inlet and outlet control

• Culvert Design Considerations

• Bridge Hydraulic Design Considerations

• Use of design charts

• Use of Software

Review of Drainage Design Computer Software

• Simple models compared to complex models

• User expectations and required knowledge

• Introduction to SWMM Modeling

Day 2 Workshop

• Basic Steps in Drainage Analysis & Design

• Open Channel and Sewer Design

• Culvert Design