MGSFlood™

A Continuous Simulation Stormwater Platform

MGSFlood is a platform tool for stormwater design in Western Washington that employs modeling methods, continuous flow simulation and design methods consistent with stormwater regulatory requirements, as opposed to traditional single-event design storm methods.

Rain falling on a roof. Photo by Alan Henrique.

Why Choose MGSFlood?

Designed for professionals

Focused on the hydrologic processes and outputs most important to stormwater facility design, permitting, and ecological outcomes.

Ready-to-use datasets

Immediate access to long-term, 5-minute precipitation and evaporation records that are otherwise complex and time-consuming to assemble.

Extensible and customizable

Accepts user-supplied precipitation inputs and can be adapted to other regions with the ability to further develop extended time series and regional parameter sets.

Faster, more defensible designs

Continuous simulation results that can be easily and quickly evaluated, allowing for efficient and defensible infrastructure design.

Support and services

Responsive email and phone support and training.

Features

Black and white photo of a river. Photo by Frank Cone.

Trusted by engineers, planners, developers, designers and stormwater professionals across municipalities, consulting firms, and research institutions.

Intuitive drag-and-drop graphical interface for fast model construction and modification
Automated compliance checks and workflows aligned with SWMMWW requirements
One-click sizing and optimization routines for ponds and infiltration trenches
Built-in Green Stormwater Infrastructure (GSI) simulation modules
Stormwater detention and water-quality treatment sizing tools (design volume and discharge rate calculations)
Stream channel simulation with complex cross-sections and floodplain interactions
Wetland hydroperiod analysis tools
Hydrograph export for routing and hydraulic programs (e.g., SWMM EXTRAN)
Seasonal flood frequency and duration statistics to inform construction scheduling and risk management
Plotting, comparison, and reporting tools to demonstrate pre/post development outcomes and regulatory compliance

Our Model

MGSFlood uses the Hydrological Simulation Program–FORTRAN (HSPF) runoff routines to simulate land-surface and subsurface hydrology over multi-year periods. The model continually tracks moisture on the ground, in soil layers, and in groundwater, producing long timeseries of runoff and streamflow suitable for design, permitting, and environmental analysis.

A screen from MGSFlood showing a flood frequency plot.

Contact us

For general inquiries or questions about MGSFlood, please use the following form or email us at MGSFlood@rti.org . For technical support, please email MGSFlood.support@rti.org.