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




Log into Webinar
8:00 – 8:30 am CST 

Morning Session
8:30 – 11:30 am CST

11:30 am – 12:30 pm CST

Afternoon Session
12:30 – 4:00 pm CST






Presented by Chris Naidu, PE


Introduction, History, and Development of US Army Corps HEC-HMS Software

Brief history
Applications of HEC-HMS
Computational categories


Basic Hydrologic Concepts

The hydrologic cycle and HEC-HMS
User interface
Input, output



Loss Rates

Loss computation assumptions and methods
Accounting for urbanization
Selecting a loss method and estimating parameters



Unit Hydrographs and Rainfall/Runoff

Assumptions of the unit hydrograph
Derivation and application of the unit hydrograph
Selecting a unit hydrograph method and estimating parameters




Storm distributions
Hypothetical vs. historical storms
Sources of precipitation data



Hydrograph Routing

Purpose, importance, and effects of hydrograph routing
Routing methods
Diversions and returns




Purpose, importance, and effects of reservoir routing
Types of reservoirs and detention
Reservoir routing input and output



Using Diversions

Applications for flow diversions



Using HEC-HMS in Design

Design example walkthrough








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 will be provided for each webinar attended and will be sent via email in PDF form about five business days after the conclusion of the series.

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

Floodplain Managers
6.0 CECs







Continuing Education Credit Information

This webinar offers 6.0 PDHs to professional engineers licensed in all states.

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), North Carolina (S-0130), and North Dakota. HalfMoon Education is deemed an approved continuing education sponsor for New York engineers via its registration with the American Institute of Architects Continuing Education System (Regulations of the Commissioner §68.14(i)(2)). Other states do not preapprove continuing education providers or courses.

The Association of State Floodplain Managers has approved this course for 6.0 CECs for floodplain Managers.

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


Chris Naidu

Water Resources Civil Engineer, Senior Project Manager at RESPEC
Mr. Naidu has more than eight years of experience in drainage and flood control projects throughout New Mexico. His experience includes preparation of drainage management plans (DMP), hydrologic analysis, hydraulic analysis of flood control structures, sediment transport, and scour analysis for unlined arroyos and bridge structures. Using modeling/analysis software, Mr. Naidu produces high-quality hydrologic and hydraulic models. He has a proven record of preparing easy-to-understand reports and corresponding maps and figures. He has prepared hydrographs and analyzed storm drains, weirs, pump stations, and detention/surge ponds. Additional skills include preparation of plan specifications, bidding and construction plans, cost estimates, and bidding services. He is familiar with Arc Geographic Information System (ArcGIS); Hydrologic Engineering Center (HEC) Hydrologic Modeling System, HEC Geospatial Hydrologic Modeling Extension (geoHMS0), HEC River Analysis System, US Environmental Protection Agency Storm Water Management Model (EPA SWMM), StormCad, and CulvertMaster.

Streamable MP4/PDF Price: $279.00

Streamable self-study formats are available approximately 5 weeks after the date of the live event.

The streamable self-study package includes an MP4 format video recording of a live webinar and a PDF of the manual that was distributed for the webinar. You will receive a PDF of the course manual. The manual contains written materials prepared by the seminar speaker(s).

Completion of an online follow-up quiz is required for those seeking continuing education credit. The acceptance of self-administered continuing education activities vary widely between states and professions. Before undertaking any self-study effort, you should review the rules of your licensing/certifying entity.

HalfMoon Education guarantees its products. The self-study products are recorded from a live seminar and there are circumstances where an audio recording is not available. HalfMoon will contact you and issue a full refund if the product you ordered is not available. If you are not happy with a product you receive, you can return the product for a full refund. However, refunds will not be issued if completion certificates are requested.

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