Setup Menus in Admin Panel

V1 Education

V1 Media, the publisher of Informed Infrastructure Magazine, is an approved AIA continuing-education provider. AIA-approved courses are a valid form of Learning Units (LU) and Professional Development Hours (PDH) for the Architecture, Engineering and Construction (AEC) industries via self-learning courses in all states.

Free registration required before viewing this course

Already have an account? Click here to log in.

Guidance for Designing External Stormwater Diversion Structures

Course Information

Months of design, pages of specifications, and tens or even hundreds of thousands of dollars may go into the design of a single bioswale, filtration basin or other stormwater treatment system. So why do engineers spend so little time thinking about the flow-control devices that make them work? This article focuses on the design of external stormwater diversion structures—an integral component of a complete stormwater management system.

“First flush” is a concept familiar to designers of stormwater treatment systems and refers to the initial surface runoff of a rainstorm. During this phase, water pollution entering storm drains in areas with high proportions of impervious surfaces is typically more concentrated compared to the remainder of the storm. Consequently, these high concentrations of urban runoff result in high levels of pollutants discharged from storm sewers to surface waters.


Seth Sokol, P.E.

Learning Objectives

At the conclusion of this article, the reader should be able to:

• Understand the role diversion structures play in the overall performance of stormwater management systems

• Understand the difference between online and offline flow-control systems

• Understand the two primary methods used to divert flows in a precast manhole

• Understand the key design considerations for offline systems


This Professional Development Section provides an opportunity to earn continuing-education credit without cost. Take a look at the learning objectives, read this sponsored article, and complete the quiz at

Answers to the quiz will automatically be calculated. If eight or more of the questions are answered correctly, participants can immediately download a certificate of completion and be awarded 1.0 professional-development hours (equivalent to 1.0 continuing-education units in most states).

V1 Media is an approved provider of the American Institute of Architects’ Continuing Education System (AIA/CES). It is up to each licensee to determine if this credit meets their governing board’s registration requirements.

Already have an account? Click here to log in.

© Vector1 Media. All rights reserved.