• Distributed
• Physics-based
• Efficient
• GIS data
• Scalable
• Radar Input

For more information on the specific features of Vflo™, download the Vflo™ Features Comparision (PDF).

Vflo™ provides high-resolution, physics-based distributed hydrologic modeling for managing water from catchment to river basin scale. Improved hydrologic modeling capitalizes on access to high-resolution quantitative precipitation estimates from model forecasts, radar, satellite, rain gauges, or combinations of multi sensor products. Worldwide digital data sets offer tantalizing detail, which Vflo™ utilizes directly at any resolution.

Predicting flow rate and depth at any location in a watershed can be accomplished with the Vflo™ distributed hydrologic model. After event reconstruction is used to calibrate the model for real-time operation, radar rainfall, geospatial data, and hydraulic channel characteristics are used to create a powerful tool for continuous flood forecasting, drainage design, hydropower, and water management. Network approach supports integrated modeling from catchment to regional scales.

Results from this hydrologic model can be displayed in this animation showing flood risk and inundation in Greenville, NC, as well as this animation showing the remnants of Tropical Storm Allison, modeled over a 3000 mi² (8000 km²) drainage area..

Vflo™ is a much more detailed hydrologic model than other lumped (or partially distributed) models. It produces hydrographs based on conservation equations and the hydraulics of the drainage network. The model capitalizes on investments made in geospatial data such as LiDAR terrain data and other digital maps of impervious area, soils, and land use/cover. The model parameters are derived from the geospatial data and are used for model setup. Input relies on radar rainfall produced from the RainVieux system, which supports modeling of specific storm events at locations where there are no rain gauges. Because it is physics-based, it does not use a unit hydrograph and can be used in areas where previous modeling studies or observed flow are unavailable.

A flow network allows basins to be defined based on which grids are selected for generation of stage or discharge hydrographs as queried. Unlike any other hydrologic model we are aware of, Vflo™ was designed to take advantage of the spatial variability of radar rainfall and high resolution GIS datasets. Rather than being created to establish design flows that may not be representative of specific conditions, Vflo™ was designed to model actual storm events with radar input to simulate observed flow or highwater marks.

Extensions to Vflo™ support continuous modeling that accounts for soil moisture, and can produce inundation maps in real-time or in post analysis. Desktop Vflo™ has been used for investigation of the impacts of landuse changes; reservoir recharge from infiltration; flood event reconstruction, preparation for real-time application of the model; operational flood alert, education, and research and analysis of hydrologic phenomena. Using high-resolution geospatial data and radar input enhances our understanding of flooding and how to design to alleviate undesired stormwater impacts.

• Extendable to ungauged rivers
• Parameter input using GIS data sets
• Efficient simulation (days in seconds)
• Finite elements based on digital terrain
• Meaningful prediction without calibration
• Radar, rain gauge, satellite or multi sensor rainfall input
• Forecast flooding using detected and forecasted precipitation
• Scalable from upland watershed to river basin using the same drainage network

Desktop Vflo™ for Windows

This easy to use interface is useful for model calibration, event reconstruction, rainfall product evaluation, research and assessment of water quality or quantity scenarios.

Continuous Vflo™

This edition supports continuous runoff simulation using distributed rainfall input. This edition allows years of runoff simulation to be run for complex dynamic systems involving aquifer recharge, spring flow, and distributed runoff.

Real-time Vflo™

The same Vflo™ modeling engine used in desktop calibration and validation is used for real-time predictions. Once the satisfactory results using the desktop edition, the model may be put into operation with the real-time model engine to provide forecasts at any location in the drainage network.

Near real-time flow predictions are generated providing a powerful web-based tool for hydrologic prediction.

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