**Group/Site (up to 30 engineers)**

Member $199.00 | Non-Member $299.00

**View Important Policies and System Requirements for this course.**

**Instructor Information:**Mark Peterson, P.E., M.ASCE

**Course Length:**1 Hour

## Purpose and Background

Time of concentration is a frequently overlooked parameter in urban drainage design. It is often calculated using one of several common equations that are selected based on user familiarity rather than on the characteristics of the drainage basin. Time of concentration can also be calculated incorrectly when the emphasis is placed on finding the "longest flow path,” which often is not appropriate when used to determine peak flows. This webinar will cover the Kirby-Hathaway Equation; the Kirpich Equation; the FAA Equation; the SCS Method for computing time of concentration; as well as a solution using the physical concepts of sheet flow, shallow concentrated flow, and open channel flow. The webinar will include examples of the different equations and a discussion on when the use of each equation is appropriate. It will also include a discussion on requirements for time of concentration calculations in stormwater design manuals.

The speaker will discuss:

- Basic concepts of time of concentration, including sheet flow, shallow concentrated flow and open channel flow
- Kirby-Hathaway, Kirpich, and FAA equations
- The SCS method
- Physical Concepts solution
- Appropriate selection of longest flow path

## Learning Outcomes

Upon completion of this course, you will be able to:

- Know the basic tools needed to select an appropriate method to compute time of concentration
- List five different methods that can be used to compute time of concentration
- Determine which method should be used for which type of drainage basin
- Examine how selection of the wrong flow path can impact the calculation of time of concentration and peak flow
- Identify examples of several methods that can be used to compute time of concentration and when each method is appropriate

## Webinar Benefits

- Become familiar with five different methods that can be used to compute time of concentration
- Understand which method should be used for which type of drainage basin
- Learn how selection of the wrong flow path can impact the calculation of time of concentration and peak flow

**Assessment of Learning Outcomes**

Students' achievement of the learning outcomes will be assessed via a short post-assessment (true-false, multiple choice and fill in the blank questions).

## Intended Audience

Civil engineers involved in designing stormwater facilities or regulatory agency personnel responsible for reviewing stormwater facilities or preparing stormwater design manuals.

## Webinar Outline

- Basic concepts of time of concentration, including sheet flow, shallow concentrated flow and open channel flow
- Kirby-Hathaway equation, including basin types
- Kirpich equation, including basin types
- FAA equation, including basin types
- SCS Method
- Physical Concepts solution
- Appropriate selection of longest flow path

**How to Earn your CEUs/PDHs and Receive Your Certificate of Completion**

To receive your certificate of completion, you will need to complete a short on-line post-test and receive a passing score of 70% or higher within 1 year of purchasing the course.

**How do I convert CEUs to PDHs?**

1.0 CEU = 10 PDHs [Example: 0.1 CEU = 1 PDH]

**Instructor Information:**Mark Peterson, P.E., M.ASCE

**Course Length:**1 Hour

## Purpose and Background

Time of concentration is a frequently overlooked parameter in urban drainage design. It is often calculated using one of several common equations that are selected based on user familiarity rather than on the characteristics of the drainage basin. Time of concentration can also be calculated incorrectly when the emphasis is placed on finding the "longest flow path,” which often is not appropriate when used to determine peak flows. This webinar will cover the Kirby-Hathaway Equation; the Kirpich Equation; the FAA Equation; the SCS Method for computing time of concentration; as well as a solution using the physical concepts of sheet flow, shallow concentrated flow, and open channel flow. The webinar will include examples of the different equations and a discussion on when the use of each equation is appropriate. It will also include a discussion on requirements for time of concentration calculations in stormwater design manuals.

The speaker will discuss:

- Basic concepts of time of concentration, including sheet flow, shallow concentrated flow and open channel flow
- Kirby-Hathaway, Kirpich, and FAA equations
- The SCS method
- Physical Concepts solution
- Appropriate selection of longest flow path

## Learning Outcomes

The following learning outcomes have been established for webinar participants:

- Know the basic tools needed to select an appropriate method to compute time of concentration
- Become familiar with five different methods that can be used to compute time of concentration
- Determine which method should be used for which type of drainage basin
- Examine how selection of the wrong flow path can impact the calculation of time of concentration and peak flow
- Identify examples of several methods that can be used to compute time of concentration and when each method is appropriate

## Webinar Benefits

- Become familiar with five different methods that can be used to compute time of concentration
- Understand which method should be used for which type of drainage basin
- Learn how selection of the wrong flow path can impact the calculation of time of concentration and peak flow

## Intended Audience

Civil engineers involved in designing stormwater facilities or regulatory agency personnel responsible for reviewing stormwater facilities or preparing stormwater design manuals.

## Webinar Outline

- Kirby-Hathaway equation, including basin types
- Kirpich equation, including basin types
- FAA equation, including basin types
- SCS Method
- Physical Concepts solution
- Appropriate selection of longest flow path

**View Important Policies and System Requirements for this course.**

**Assessment of Learning Outcomes**

Students' achievement of the learning outcomes will be assessed via a short post-assessment (true-false, multiple choice and fill in the blank questions).

**How to Earn your CEUs/PDHs and Receive Your Certificate of Completion**

To receive your certificate of completion, you will need to complete a short on-line post-test and receive a passing score of 70% or higher within 1 year of purchasing the course.

**How do I convert CEUs to PDHs?**

1.0 CEU = 10 PDHs [Example: 0.1 CEU = 1 PDH]