Continuous Hydrologic Modeling & MGSFlood

RTI provides MGSFlood, a continuous simulation platform developed to support stormwater design and regulatory compliance in Western Washington. Unlike traditional single-event design storm approaches, MGSFlood models watershed response over long periods using continuous precipitation and evaporation records, allowing engineers to evaluate stormwater system performance across the full range of hydrologic conditions.

Designed for Efficient Stormwater Planning and Compliance

Built for engineers, planners, and stormwater professionals, MGSFlood combines physically based hydrologic modeling with an intuitive graphical interface to support efficient design and analysis of stormwater infrastructure. The platform includes ready-to-use climate datasets, automated compliance workflows aligned with SWMMWW requirements, and tools for sizing detention facilities, infiltration systems, and green stormwater infrastructure. 

Powered by HSPF for Detailed Hydrologic Modeling

MGSFlood is built on the HSPF hydrologic simulation engine, which tracks soil moisture, groundwater, and runoff processes over multi-year periods to produce detailed time series of flow and watershed response. These results provide a robust basis for stormwater facility design, permitting, environmental analysis, and watershed planning.

With built-in analysis and reporting tools, MGSFlood enables engineers to quickly evaluate system performance, compare pre- and post-development conditions, and develop defensible, regulatory-compliant stormwater designs.