Vflo®
What is Vflo? Vflo is a gridded, physics-based hydrologic model that can simulate stormwater runoff based on geospatial data to model interior locations in the drainage network. It is used to simulate runoff from major river basins to small catchments. The same modeling framework is used to develop detailed drainage infrastructure design, or for realtime forecasting of rainfall runoff and flooding.
Actual and Design Rainfall Vflo was designed to use distributed rainfall input from Gauge-Adjusted Radar Rainfall (GARR) that characterizes actual storm distributions, as well as dynamically generated design storms. The model increases understanding of watershed response to historic rainfall events, or to design storm hyetographs that can be configured to move over the watershed while preserving point return interval depths and durations.
Continuous Soil Moisture Through unattended simulation, runoff is produced using distributed rainfall maps and definition of evapotranspiration rates for specific vegetative cover. Output options include infiltrated depth for coupling with groundwater recharge models, and distributed maps of depth/discharge for inundation modeling.
We offer two different Vflo products:
Real-time Vflo Real-time runoff monitoring and prediction for flash flood prediction and emergency management support are accomplished by coupling RainVieux with Real-time Vflo. The system runs in unattended mode sending automated notifications, and can be used with short-term Quantitative Precipitation Forecasts.
Desktop Vflo Perform automated basin delineation, model setup, calibration and design functions with the Desktop edition. Additional modules are available for continuous simulation, inundation analysis, design storm generation and sensitivity analysis.
Features & Benefits
  • Quick Setup - Simplify and greatly reduce the time necessary to get a model setup and start simulating your watershed. Integrated GIS functions allow the user to read geospatial grids to create basin delineations and perform parameter input.
  • Accurate Hydrographs - Achieve accurate results with a solver that reproduces hydrograph shape and timing without resorting to legacy unit hydrograph coefficients that may not represent your watershed. Efficiently handle complex bridge rating curves, transitioning from open channel to orifice and weir flow.
  • High Definition Watersheds - The physics-based distributed approach and user interface portrays in high definition, the spatial distribution of slope, network connectivity, celerity, hydraulics, infiltration, and land cover/use parameters.
  • Efficient Model Calibration - Explore distributed parameter sensitivity and calibration through the Sensitivity or AutoCal extensions, and evaluate a range of parameters for optimization.
  • Simulate the Entire Period of Record - Compute continuous soil moisture, actual evapotranspiration, and runoff with distributed rainfall maps as input, along with ET and crop coefficients. Distributed maps of infiltration and stage hydrographs may be generated for use in visualization and groundwater model interfacing. Periods of years can be effortlessly simulated with maps of rainfall from GARR at high resolution as a batch process.
  • Integrated Map Inundation - Create maps of inundation in every channel from distributed stage throughout the watershed from within Vflo using the Inundation extension. View the distributed stage maps throughout the event. Export the timeseries of images of inundated areas for use and interpretation, or in GIS formats.
  • Find the Dynamic Response - Storm Builder allows the user to explore the effects of storm movement within an integrated user interface. Storm Builder allows generation of dynamic storms with specified speed and direction for representative hyetograph shapes. Results are automatically exported to the model domain for simulation.