Flood Management Planning

Many places across the country, including Montgomery County, have experienced an increase in flooding because of intense rainstorms: OLO Report 2021-5 – Measuring Climate Resilience (PDF). The odds of these storms happening are expected to continue to increase in the future due to climate change. The pages linked below provide information on what the County is doing to understand and address flood risks, background on flood-related terminology and concepts, information about flood modeling, and access to the results of flood modeling completed by the County.

Woman standing and showing a paper with colleagues holding a planning meeting in a conference room.

Introduction to Flood Management Planning

Rain falling on green leaves.

Rainfall and Flooding Terminology

Stormwater management structure: wet pond.

Managing Stormwater

Four emergency personnel in yellow suits with reflective stripes and black boots wading down a flooded residential road.

Understanding Flood Risk

Map of watersheds to be modeled: Northwest Branch, Sligo Creek, Northwest Branch/Bel Pre Creek, Lower Rock Creek, Middle Rock Creek, Middle Great Seneca Creek, Midle Great Seneca Creek/Whatstone Run, Muddy Branch, Watts Branch, Cabin John Creek, and Little Falls Branch.

Montgomery County's Flood Model

Room filled with people in professional clothing raising hands to ask questions.

FAQs

Screenshot of Flooding Risk Explorer with flood depth legend and flood scenario selection menu.

Using the Flood Risk Explorer

Map of the lower watersheds of Montgomery County Maryland

Open the Flood Risk Explorer

Contact Us

If you have questions about the County's Comprehensive Flood Management Planning (CFMP) process, please contact us at [email protected] or call 311. If you have questions about the Flood Risk Explorer, please contact us at [email protected] or call 311.