Floodplain Management: How to apply for a Letter of Map Amendment, Start to Finish: Live Webinar

Floodplain Management: How to apply for a Letter of Map Amendment, Start to Finish: Live Webinar


This program is a Live Interactive Webinar:

Date: Wednesday March 8, 2023 Time: 6:30pm to 8:30pm

2 Professional Development Credits 

You will need an i-phone, i-pad, lap top, or desk top to view it.  You WILL need a microphone and webcam. Teacher must be able to see and speak with you during the class to verify your attendance.

Webinar links are emailed one day prior to the class date.

We are approved provider by:

NJ Board of Professional Engineers and Land Surveyors
New York Board of Professional Engineers , Sponsor # 201  beginning 2/1/2018 to 1/31/2024
Florida Board of Professional Engineers: Laws and Rules and Ethics, Provider number 007543 (Ethics) 0010489
Florida Board of Professional Engineers: CE provider Provider number 0007543
Maryland Board for Professional Engineers



Floodplain Management: How to apply for a Letter of Map Amendment, Start to Finish


Flood mapping depicts conditions at the time of data collection, not the time of publication, and is subject to limitations of the collection and analytical methods and tools used to create that mapping. This brief session begins with an explanation of what a Letter of Map change is and why anyone should apply for one, making a distinction between map Amendments, map Revisions, and variances. We then address the following technical aspects of the Letter of Map Amendment:

  • Platforms for submitting map change applications: when to use one or the other
  • Required information to submit with a LOMA application and where to find it, including:
    • Sources of Base Flood Elevation for a LOMA application
    • Reporting Intervening high ground that affects a LOMA application
    • Determining what flood zone the site should be in, rather than the mapped one
  • Responding to requests for additional information




Wendy Lathrop, PLS,CFM president and owner of Cadastral Consulting, is licensed as a Professional Land Surveyor in New Jersey, Pennsylvania, Delaware, and Maryland, and as a Professional Planner in New Jersey. She holds a Master’s degree in Environmental Policy, and has been involved in surveying since 1974 in projects ranging from construction to boundary to environmental land use disputes. Wendy is also a Certified Floodplain Manager through the Association of State Flood Plain Managers (ASFPM).

A former adjunct instructor at Mercer County College in New Jersey, Wendy has also taught as part of the team for the licensing exam review course at Drexel University in Pennsylvania. She has been teaching seminars for surveyors since 1986 and has been writing articles for surveyors since 1983. Wendy is a contributing editor for “The American Surveyor” magazine, and has four articles included in the American Bar Association’s text, Land Surveys: A Guide for Lawyers and Other Professionals. She and Stephen V. Estopinal, PLS, PE recently completed co–authoring a book entitled Professional Surveyors and Real Property Descriptions: Composition, Construction, and Comprehension, published by John Wiley & Sons, Inc.

Wendy represented the American Congress on Surveying and Mapping (now the National Society of Professional Surveyors) on the first Technical Mapping Advisory Council to the Federal Emergency Management Agency for the five years of that advisory group’s appointment, and presently represents the National Society of Professional Surveyors on the current Technical Mapping Advisory Council. She was a panel member of the National Academy of Public Administration’s study of US Geographic Information resources and of the National Research Council’s study of flood hazard mapping accuracy. Wendy is a past President of the New Jersey Society of Professional Land Surveyors and of the National Society of Professional Surveyors, and has served on the Board of Directors for the American Association for Geodetic Surveying.