Webinar instructions will be emailed before the date of the webinar.

Please log into the webinar 15 – 30 minutes before start time.

Tuesday, March 21, 2023
8:30 AM – 4:30 PM CDT (including a 60-min. break)


Stormwater Management System Objectives and Design Considerations 

  • Complying with stormwater regulations 
  • Site assessment 
  • Preparing stormwater pollution prevention plans 
    • Stormwater goals 
    • Design considerations  
  • Anticipated developments in NPDES stormwater permitting 


Stormwater Detention Basics 

  • Detention goals 
  • Determining impact area and flow 
  • Excavation 
  • Soil preparation and vegetation 
  • Inflow and outlet structures 
  • Detention pond safety and maintenance 


Stormwater Retention Basics 

  • Retention goals 
  • Determining impact area and flow 
  • Sizing and excavation 
  • Forebay, primary pool and emergency outflow 
  • Soil preparation and vegetation 
  • Retention pond safety and maintenance 
  • Multiple use options 


Sustainable Detention and Retention Options 

  • Implementing low impact development practices 
  • Naturalizing detention/retention basins 
  • Rain gardens 
  • Underground storage and water reuse options 


Detention and Retention Case Studies 


Webinar Instructions
All attendees must log-on through their own email – attendees may not watch together if they wish to earn continuing education credit. HalfMoon Education Inc. must be able to prove attendance if either the attendee or HalfMoon Education Inc. is audited.

Certificates of completion can be downloaded in PDF form upon passing a short quiz. A link to the quiz will be sent to each qualifying attendee immediately after the webinar. The certificate can be downloaded from the Results page of the quiz upon scoring 80% or higher.

Webinars are presented via GoToWebinar, an easy-to-use application that can be run on most systems and tablets. Instructions and login information will be provided in an email sent close to the date of the webinar. It is highly recommended that you download, install and test the application before the webinar begins by clicking on the link in the email.

GoToWebinar App requirements:
Windows 7 – 10 or Mac OSX Mavericks (10.9) – macOS Catalina (10.15)

Web Browser:
The two most recent version of the following browsers:
Google Chrome, Mozilla Firefox, Apple Safari, Microsoft Edge
Internet Explorer v11 (or later) with Flash enabled

Internet connection: Minimum of 1Mbps       Hardware: 2GB RAM or more

For more information, visit the Support section at


6.5 PDHs 

6.5 HSW CE Hours 

6.5 HSW LUs

Landscape Architects 
6.5 HSW CE Hours 

6.5 HSW PDHs

International Code Council 
0.65 CEUs (Sitework)

Floodplain Managers 


This webinar is open to the public and is designed to qualify for 6.5 PDHs for professional engineers, 6.5 HSW continuing education hours for licensed architects, and 6.5 HSW continuing education hours for landscape architects in all states that allow this learning method. Please refer to specific state rules to determine eligibility. 

HalfMoon Education is an approved continuing education sponsor for engineers in Florida (Provider No. 0004647), Indiana (License No. CE21700059), Maryland, New Jersey (Approval No. 24GP00000700) and North Carolina (S-0130). HalfMoon Education is deemed an approved continuing education sponsor for New York engineers and architects via its registration with the American Institute of Architects Continuing Education System (Regulations of the Commissioner §68.14(i)(2) and §69.6(i)(2)). Other states do not preapprove continuing education providers or courses. 

The American Institute of Architects Continuing Education System has approved this course for 6.5 LU|HSWs (Sponsor No. J885). Only full participation is reportable to the AIA/CES.

The Landscape Architecture Continuing Education System has approved this course for 6.5 HSW PDHs. Only full participation is reportable to the LA CES.

The International Code Council has approved this event for .65 CEUs in the specialty area of Sitework (Preferred Provider No. 1232).

This webinar has been approved by the Association of State Floodplain Managers for 6.5 CECs for floodplain managers. 

Visit this course listing at for updates on pending credits. Completion certificates will be awarded to participants who complete this event and earn a passing score (80%) on the quiz that follows the presentation (multiple attempts allowed). 


On-Demand Credits 

The above pre-approval(s) only apply to the live presentation. This course in an on-demand format may not be eligible for the same credits as the live presentation; please consult your licensing board(s) to ensure that a structured, asynchronous learning format is appropriate. The following pre-approvals may be available for the on-demand format upon request: 

6.5 HSW LUs (AIA) 

6.5 HSW PDHs (LA CES) 



Daryl Norris

Civil Engineer, Floodplain Manager with Norris Environmental Engineering, PLLC

Mr. Norris is a civil engineer for the City of Greenville, North Carolina, specializing in stormwater engineering, and he is the owner of Norris Environmental Engineering, PLLC. Mr. Norris is a professional engineer, a certified floodplain manager, a certified professional in stormwater quality, and a certified professional in low impact development. Prior to working for the City of Greenville, he worked with the North Carolina Wildlife Resources Commission and the North Carolina Division of Water Quality. Mr. Norris was also the environmental specialist and floodplain administrator for the City of Wilson. He holds a bachelor’s degree in Fish and Wildlife Management and a master’s degree in Biological and Agricultural Engineering, both from North Carolina State University.

AIA Info

AIA Provider Statement:

HalfMoon Education Inc. is a registered provider of AIA-approved continuing education under Provider Number J885. All registered AIA/CES Providers must comply with the AIA Standards for Continuing Education Programs. Any questions or concerns about this provider of learning program may be sent to AIA/CES ( or (800) AIA 3837, Option 3).

This learning program is registered with AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product.

AIA continuing education credit is currently still pending for this course. Learners must complete the entire learning program to receive continuing education credit. AIA continuing education Learning Units earned upon completion of this course will be reported to AIA/CES for AIA members. Certificates of Completion for both AIA members and non-AIA members are available upon request.

Course Title: Stormwater Detention/Retention System Design

Delivery Method: Live Online

Course Description: This course focuses on the objectives, design, maintenance and sustainability of stormwater detention and retention basins. Specifically, this course identifies stormwater management system objectives and design considerations, analyzes the basics and designs of detention and retention basins, explores sustainable options, and utilizes relevant case studies.

Learning Objectives:

Learning Objective 1: Learners will be able to explore stormwater regulation compliance strategies, prepare stormwater pollution prevention plans and discuss the anticipated developments in NPDES stormwater permitting.

Learning Objective 2: Learners will be able to identify stormwater detention goals, determine impact area and flow, utilize inflow and outlet structures, and discuss detention pond safety and maintenance requirements.

Learning Objective 3: Learners will be able to identify stormwater retention goals, assist in sizing and excavation, utilize forebays and emergency outflow systems and discuss multiple use options.

Learning Objective 4: Learners will be able to implement low impact development practices, naturalize detention/retention basins, design rain gardens, and utilize underground storage and reuse options.

LUs: 6.5                                                                                               LU Type: LU|HSWs.

Prerequisites: Experience with sitework

Advance Preparation: None

Program Level: Intermediate

Course Expiration Date: 01/26/2026

Complaint Resolution Policy:

Complaints regarding this course can be emailed to or by calling (715) 835-5900. A HalfMoon Education representative will respond within 72 hours to resolve the complaint, which will include, but not limited to, access to another CE activity at no or reduced cost or a full or partial refund. Each instance will be resolved on a case-by-case situation.