Welcome to FLO-2D Software

FLO-2D is a flood routing model that simulates channel flow, unconfined overland flow and street flow over complex topography.   Experience the diversity and complexity of the flood simulation details by adding rainfall, infiltration, sediment transport, buildings, levees, embankments, walls (wall collapse), dam breach, mudflows, storm drain, culverts, bridges, hydraulic structures and groundwater.  Rainfall, infiltration and most features can be spatially and temporally variable with historical rainfall events replicated with NEXRAD data.  The new FLO Pro model is the most comprehensive and affordable 2-D model in the world.


FLO-2D is a comprehensive, fast, user friendly hydraulic and hydrologic model for flood routing.

Choose between the Basic Model and the new Pro Model subscription service.  The Basic Model is absolutely free with unlimited nodes and a wealth of flood modeling features.  The Pro Model delivers flood routing diversity with added dam breach, sediment transport, mudflow, groundwater and storm drain components.  With the Pro Model annual subscription service ($995 US), you will receive the Pro Model, technical support, free training webinars, updates, newsletter and discount short courses.


FLO-2D is a complete hydrologic and hydraulic flood routing model.  Chose either the Basic or the Pro Model.

FLO-2D – Basic Model – Free download and distribution.

The FLO-2D Basic is an integrated river and floodplain 2-D flood routing model.  It routes flood hydrographs and rainfall runoff with many urban detail features including street flow, levees and walls and hydraulic structures.  It is FEMA approved for Flood Insurance Studies.  You can load this model on as many computers and office sites as you need.  Absolutely no restrictions and it’s FREE.  If you need help or technical support, purchase the FLO-2D Pro subscription service.

FLO-2D – Pro Model – Subscription service includes:

The Pro Model:   Storm drain modeling with surface water interface, dam and levee breach, groundwater model exchange with surface water, sediment transport, mud and debris flows along with all the Basic Model components.  Plus you get…

Technical Support – Free Training Webinars – Model Updates – Discount Short Courses – Newsletter


Review the training webinar schedule.  The webinars are FREE with the Pro Model subscription service.

Upcoming Webinars


Training Packages



Special Recent Posts

Channel n-value Tools

Each quarter, the newsletter will highlight a new FLO-2D tool or feature.  With the new PRO model th[...]

SWMM Interface Enhancements

The FLO-2D Model has been integrated with the EPA Storm Water Management Model Version 5.0[...]

Mapper++ Overview

FLO-2D Mapper++ is the post-processor program that creates maps and other plots of t[...]