Urban Storm Drainage Design
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Streamable MP4/PDF
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Agenda
Webinar instructions will be emailed 24-48 business hours before the date of the webinar.
Please log into the webinar 15 – 30 minutes before start time.
Wednesday, December 3, 2025
9:00 am – 4:30 pm CST
Agenda:
Presented by William Rahmeyer
Urban Storm Drainage Design Introduction and Background
- Course introduction and expectations
- Urban drainage systems
- Webinar objectives
- Design considerations
- Stormwater management and infiltration
- Sustainability and environmental
- References and software
- Roadway storm drains versus roadside swales
- Design EXAMPLE #1 of a roadway lateral swale
- EPA SWMM 5
- Floods and storm runoff
Storms And Stormwater Runoff
- Storms and stormwater runoff – hydrology
- The Rational method
- The runoff coefficient
- The rainfall intensity
- Total time of concentration tC
- Sheet flow travel time
- Shallow concentrated flow travel time
- Channel and gutter flow travel times
- Regression equations and the TR-55 (Win TR-55) method
- EXAMPLE #2 Rational equation (by hand, using Toolbox, using Win TR-55)
Drainage Hydraulics
- Drainage flows, channels, and structures
- Type of drainage flows and drainage flow definitions
- Normal depth and drainage flow equations
- Continuity and energy equations
- Energy and local losses
- EXAMPLE #3 Application of the energy equation
- Hydraulic radius
- Trapezoidal channels, parabolic swales, and circular conduits
- The Froude number FR and critical Depth Yc
- Subcritical and supercritical flows
- Manning’s equation for uniform / steady flow
- Resistance coefficients (rigid boundaries)
- GVF Profiles, FR (for trapezoidal channels)
- EXAMPLE #4 (Yo, Yc, FR for trapezoidal channels and parabolic swales)
- Urban drainage culverts
- HY8 software and HY8 EXAMPLE #5
Detention Basins
- Detention basin design
- Considerations for detention basins
- Stage versus depth
- Modified Puls method
- Inflow hydrograph
- Design method and steps
- Storage curve and stage discharge
- Detention basin design EXAMPLE #6 (by hand and by Toolbox)
Roadway And Pavement Drainage
- Roadway, pavement, and gutter drainage
- Pavement and gutter roughness
- Hydraulic Toolbox (New gutter and curb analysis)
- Uniform and composite gutter cross-sections
- Uniform gutter design EXAMPLE #7
- Composite gutter design EXAMPLE #8
- Design pavement and gutter spread
- Types of gutter grates and curb openings
- Grate inlets on grade
- Grate in composite gutter EXAMPLES #9, #10, AND #11
- Grate inlets in a sag
- Grate inlet in sags EXAMPLES #12 AND #13
- Curb openings on grade, and depressed openings
- EXAMPLE #14 curb openings on grade
- Curb opening in a sag (weir and orifice control)
- Clogged curb openings in a sag
- EXAMPLE #16 – curb openings in a sag – orifice control
- Slotted drains on grade
- Combination gutter inlets (by hand and using Toolbox)
Storm Drain Design
- Storm drain design
- Inlet selection and spacing
- Inlet selection and spacing on grade
- Inlet selection and spacing on grade (Options A and B methods)
- Preliminary storm conduit / pipe sizing
- EXAMPLE #18 – preliminary storm conduit sizing
- Final design of the EGL and HGL
- Pipe velocity and velocity heads
- Local and friction losses
- Local loss of flow exiting the drainage system
- Friction loss in storm pipe / conduits
- Local loss of flow entering, exiting, and in access holes
- Design software
- EXAMPLE #19 – final design – EGL and HGL
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.
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Credits
Engineers
6.5 PDHs
Architects
6.5 HSW CE Hours
AIA - American Institute of Architects
6.5 HSW LUs
Landscape Architects
6.5 HSW CE Hours
LACES - Landscape Architecture Continuing Education System
6.5 HSW PDHs
ICC - International Code Council
0.65 CEUs (Sitework)
Floodplain Managers
6.5 ASFPM CECs
Continuing Education Information
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 License No: CEA362), Indiana (License No. CE21700059), Maryland, and New Jersey (Approval No. 24GP00049300). 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 (AIA/CES) and the Landscape Architecture Continuing Education System (LA/CES). 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 HSW LUs (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).
The Association of State Floodplain Managers has approved this course for 6.5 CECs for floodplain managers.
Attendance will be monitored, and attendance certificates will be available after the webinar for those who attend the entire course and score a minimum 80% on the quiz that follows the course (multiple attempts allowed).
*On-Demand Credits*
The preceding credit information only applies to the live presentation. This course in an on-demand format is not pre-approved by any licensing boards and may not qualify for the same credits; 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)
Speakers
William J. Rahmeyer
Emeritus Professor of Civil and Environmental Engineering at Utah State University (USU)Professor Rahmeyer was on the faculty at USU for 31 years and spent 10 years as research faculty at Colorado State University. Professor Rahmeyer is the past Department Head of Civil and Environmental Engineering at USU as well as the senior professor of the Hydraulics and Fluid Mechanics program of the Utah Water Research Laboratory. He also served at USU as the director of the Hydro Composite Modeling Program, the division head of Water Engineering, the interim division head of both the Structures Division and the Transportation Division, and as the Undergraduate Curriculum division head. Professor Rahmeyer is currently working part time as a senior associate for Ayres and associates in Fort Collins Colorado, where his primary role is to conduct national workshops in hydraulics, culvert flow, and urban drainage for the National Hydraulic Institute of FWHA. He is a fellow and lifetime member in the American Society of Civil Engineers. Professor Rahmeyer has been a member of several professional societies, and serve on committees for the American Society of Engineering Educators (ASEE), the American Society of Civil Engineers (ASCE), the International Association of Hydraulic Research (IAHR), the Association of State Dam Safety Officers (ASDSO), the Instrument Society of America (ISA), the American Water Works Association (AWWA), the International Erosion Control Association (IECA), and the American Society of Heating and Refrigeration Association (ASHRAE). He has regularly attended and presented at the annual conferences of ASDSO, ASEE, ASCE, IAHR, ASCE National Department Heads, and the Transportation Research Board (TRB). In the past, he has been a member of the United States Committee on Large Dams (USCOLD) and the International Committee on Large Dams (ICOLD). Over the last several years, Professor Rahmeyer has created and presented a workshop on open channel flow for HalfMoon Education and finished serving on the Bluestone Dam UASCE IEPA and on several 100% DDR review panels for the USACE. He has been on the board of directors for the Utah Floodplain and Storm Water Management Association since 1986. Professor Rahmeyer was a member the 2008 Bettelle “Final Independent Peer Review Report for U.S. Army Corps of Engineers on the Vegetation Policy for Local Flood Damage Reduction Systems” which reviewed many of the guidelines and policies for management of levees, floodwalls, embankment dams, and appurtenant structures. Some of his recent awards include the AHRAE Technical/Symposium Paper Award, the ASHRAE Crosby Field Award for Research, and the South Pacific Division Regional Project Delivery Team Award from the U.S. Army Corps of Engineers. He has received the Idaho Transportation Department 2012 Excellence in Transportation Award and the 2011 ACEC of Idaho Engineering Excellence Grand Award for the I-84 New York Canal Modeling and Modification. Professor Rahmeyer further received an honorable mention at the 2012 National AECE award ceremonies for his work with the I-84 New York Canal.
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 (cesupport@aia.org 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: Urban Storm Drainage Design
Delivery Method: Live Online
Course Description: This 6.5-hour course provides a comprehensive overview of urban storm drainage design principles, methods, and applications. Instruction covers hydrology, hydraulics, detention basin design, roadway and pavement drainage, and storm drain system design. The program emphasizes the use of design software, field examples, and regulatory considerations to support effective stormwater management and resilient infrastructure.
Learning Objectives:
Learning Objective 1: Learners will be able to apply hydrologic principles to calculate stormwater runoff in urban settings.
Learning Objective 2: Learners will be able to analyze hydraulic concepts such as energy and continuity equations, Manning’s equation, and critical flow conditions to design drainage channels and conduits.
Learning Objective 3: Learners will be able to design detention basins, roadway drainage systems, and gutter inlets using both manual methods and design software tools.
Learning Objective 4: Learners will be able to develop complete storm drain system designs, including inlet spacing, conduit sizing, and evaluation of energy and hydraulic grade lines.
LUs: 6.5
LU Type: LU|HSWs
Prerequisites: None
Advance Preparation: None
Program Level: Intermediate
Course Expiration Date: 09/25/2028
Complaint Resolution Policy:
Complaints regarding this course can be emailed to fchapman@halfmoonseminars.org 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.
6.5 Knowledge Points
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