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

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

Wednesday, April 20, 2022
10:00 am – 2:00 pm CDT
Thursday, April 21, 2022
10:00 am – 12:45 pm CDT


Presented by:
Steven Trinkaus

Agenda Day One
Understanding and Implementing Principles of Low Impact Development (LID)
Urban environment and water quality
Conventional development and stormwater management
Drawbacks of conventional approaches
Origins of LID
Principles and benefits of LID

Low Impact Development Hydrology Considerations
Water cycle and site hydrology
Defining hydrologic principles for LID
Identifying regional hydrologic considerations
Evaluating hydrologic outcomes
Hydrologic tools for LID

Low Impact Development Site Planning
Incorporating LID into common land development projects
LID site planning tools
Environmental Site Design (ESD)


Agenda Day Two
Low Impact Development Structural BMPs
Choosing and designing best BMPs
Site investigation
Bioretention systems
Dry swales
Permeable pavements (porous asphalt, porous concrete, interlocking paver systems)
Infiltration basins, trenches, underground systems
Rain barrels
Green roofs

Low Impact Development Economics, Construction and Maintenance Considerations
Construction specifications
Maintenance requirements

Low Impact Development Resources
Incorporation of LID into land use regulations
LID model ordinances


Webinar Instructions

Each webinar session earns continuing education credit and can be registered for individually. 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


Professional Engineers:
6.0 PDHs

6.0 HSW CE Hours

AIA:    (AIA credits only available for attending live Webinar)
6.0 LU|HSW

Landscape Architects:
6.0 HSW CE Hours

LA CES:    (LA CES credits only available for attending live Webinar)
6.0 HSW PDHs

Floodplain Managers:

International Code Council:
.6 CEUs (Sitework)


Continuing Education Credit Information
Low Impact Development
This webinar is open to the public and offers 6.0 PDHs to professional engineers in
all states, 6.0 HSW continuing education hours to architects in all states, and 6.0 HSW
continuing education hours to landscape architects in all states except New Jersey.

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, architects
and landscape architects via its registration with the American Institute of Architects
Continuing Education System (Regulations of the Commissioner §68.14(i)(2), §69.6(i)(2)
and §79-1.5(i) (2)). Other states do not preapprove continuing education providers or

The American Institute of Architects Continuing Education System has approved this
course for 6.0 LU|HSW (Sponsor No. J885). Only full participation is reportable to the

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

The International Code Council has approved this event for .6 CEUs in the specialty area
of Sitework (Preferred Provider No. 1232).

This webinar has been approved by the Association of State Floodplain Managers for 6.0
CECs for floodplain managers.

Completion certificates will be awarded to participants who complete this event, respond
to all prompts, and earn a passing score (80%) on the quiz that follows the presentation
(multiple attempts allowed).


Steven D. Trinkaus

Principal at Trinkaus Engineering, LLC, in Southbury, CT
Mr. Trinkaus is an internationally-recognized expert in the field of low impact development (LID), having presented at many American Society of Civil Engineers/Environmental & Water Resource Institute (ASCE/EWRI) international conferences and many other regional conferences and workshops on LID and water quality issues. He was an invited speaker by the Water Resources Agency in Taichung, Taiwan, to present a 12-hour workshop on LID in December of 2011. He has been an invited presenter and consultant multiple times on storm water and LID in China and South Korea since 2013. He has designed LID retrofits in Zhenjiang, China. He was reviewed and edited LID reports by Pusan National University and Land & Housing Institute in South Korea. Mr. Trinkaus has written LID Design Manuals for the Towns of Tolland, Plainville, Harwinton, Morris, and East Granby, Connecticut. He has designed many types of LID treatment systems for a variety of residential and commercial applications. Mr. Trinkaus is primary author of the EWRI Filter Strip/Bioswales Task Committee. Mr. Trinkaus is a licensed professional engineer in Connecticut and Maryland. He received a bachelor of science degree in Forest Management in 1980 from the University of New Hampshire. Mr. Trinkaus has more than 39 years of experience in the land development field and more than 19 years of experience designing low impact development treatment systems and ten years writing LID regulations and design manuals.

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 has been reviewed and approved by AIA/CES. 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: Low Impact Development

Delivery Method: Live Online

Course Description: This course examines the principles of stormwater low impact development, hydrology considerations for low-impact development, site planning, structural best management plans, low impact development economics, construction and maintenance.

Learning Objectives:

Learning Objective 1:
Learners will be able to discuss environmental and water quality threats in urban areas, identify the drawbacks of conventional approaches to address stormwater, and explain the principles and benefits of low impact development (LID) strategies.

Learning Objective 2:
Learners will be able to explain the science of the water cycle and site hydrology, as a foundation to understanding and implementing the objectives of low impact development and treating stormwater runoff as intended by nature.

Learning Objective 3:
Learners will be able to identify and explain the objectives and applications of structural best management practices, including bioretention systems, dry swales, permeable pavement, infiltration basins, rain barrels, and green roofs.

Learning Objective 4:
Learners will be able to describe the process of low impact development site planning and discuss the economics, construction and maintenance considerations of low impact development projects.

LUs: 6.0                                                                                             LU Type: LU|HSWs.

Prerequisites: Familiarity with stormwater management issues and practices

Advance Preparation: None

Program Level: Intermediate

Course Expiration Date: 01/13/2024

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.