GeoHECHMS - Automated Stormwater Modeling Software

Easy to Learn and Use

Interact graphically with all HEC-HMS model elements. Effortlessly create and edit subbasins, detention ponds, routing reaches and other model elements by clicking and dragging. Uncomplicated dialog boxes allow easy data entry and review.

Unlimited Undo and Redo

Correct mistakes easily with unlimited Undo and Redo capability. Experiment with different engineering and management decisions. Rollback changes one at a time or select a group of changes from a visual selection list.

Expert Technical Support

Toll-free unlimited technical support by experienced HEC-HMS stormwater modelers is just a phone call away. Quickly resolve your stormwater modeling questions and complete your engineering project—our skilled, professional engineers are here to assist you. Our technical support team is available 24-hours/day Monday-Friday, and by email on weekends.

Automated HEC-HMS Workflows

Speed up stormwater projects with automated workflows to automatically delineate watersheds, compute curve numbers (CN), compute TOC & lag times, compute % impervious, assign design storms, size detention ponds, and generate engineering reports.

MDI Multiple Model Editing

Load, edit, and run multiple HEC-HMS models simultaneously. The Multiple Document Interface (MDI) allows easy copying and pasting between models, quick comparisons of input data and results between scenarios, and other modeling efficiencies. Models can be displayed in tiled windows or tabbed views, providing greater productivity.

CAD & GIS Integration

Integrate HEC-HMS directly with AutoCAD (including AutoCAD Civil 3D), Bentley MicroStation and ESRI ArcGIS terrain data. Export completed HEC-HMS models and results to AutoCAD, MicroStation and ArcGIS.

Automated Watershed Delineation

Delineate subbasins and watersheds from 3D digital elevation terrain data. Utilize AutoCAD Civil 3D surfaces, MicroStation surfaces, contours, TINs, DTMs, DEMs, survey points, LiDAR, and other external digital elevation terrain data.

Semi-Automated Detention Pond Design

Quickly size and design detention and retention ponds for different design storms and engineering criteria. Develop outlet structures for different scenarios, considering both water quality and design storm requirements.

Complete HEC-HMS Support

Develop and compute HEC-HMS stormwater results directly within the software, no external data processing required. Read and write standard US Army Corps HEC-HMS data files, ready for regulatory agency submittal. In addition, HEC-1 models can be imported and updated to HEC-HMS.

What-If Scenario Manager Analysis

Compare different engineering models, such as existing and proposed development, different detention pond designs and more. This allows stakeholders to evaluate alternatives, allowing you to consider more innovative and environmentally sensitive designs.

Powerful Report Generation

Comprehensive, easy-to-read input data and output analysis reports are automatically generated using provided drainage report templates. Reports can be customized to meet reviewing agency requirements.

Automated TOC & CN Computations

Automatically compute the longest flow path, assign sheet flow, shallow concentrated flow and channel flow segments. Use included land use mapping and soil mapping to automatically compute composite curve numbers (CN) in minutes.

More Accurate Models
Reduce time wasted with imprecise data. Easily integrate field collected data in varying formats along with CAD and GIS data to update the HEC-HMS model to accurately reflect field conditions.

Seamlessly Share Data with HEC-RAS
To improve productivity, the HEC-HMS stormwater results computed within GeoHECHMS will seamlessly migrate to HEC-RAS. This greatly increases the speed at which users can perform HEC-RAS flood studies, design bridge and culvert roadway crossings, compute dam failures, and complete stream restoration and alignment projects.

Work Directly on the Map
Blend Google or Microsoft Bing online maps and high-resolution aerial imagery files directly into the HEC-HMS model. Quickly and easily georeference existing HEC-HMS models to background maps, AutoCAD and MicroStation drawings, or ArcGIS map data.

Purpose-Built Stormwater Design Tools
Integrated stormwater design tools offer more efficient ways to create and analyze a stormwater project, size and design detention ponds, analyze dam failures and more. Update subbasin catchment boundaries dynamically as terrain data is changed. Quickly define detention ponds and outlet structures using specialized stormwater tools.

2D & 3D Viewing and Editing
Shift seamlessly between 2D and 3D viewing perspectives to clearly identify modeling issues and make changes. Freely rotate, pan, zoom, and fly through the model to any perspective to review subbasins, detention ponds, routing reaches and more.

Stunning Visualizations
Create stunning visualizations directly from the software of different design alternatives to help better understand the impact of the design on the community and the surrounding environment. Publish the HEC-HMS model directly to Google Earth for even greater visualization and understanding of the project.

Complete Land Use Coverage
Complete land use coverage is provided for USA, Canada, Europe, Australia and many other parts of the world. For the USA, land coverage data is provided at a 100 x 100-foot grid cell size. This makes it extremely easy to compute composite curve numbers, time of concentrations, lag times and more.

Complete Imperviousness Coverage
Complete percent imperviousness coverage is provided for the USA at an approximate 100 x 100-foot grid cell size. This allows a more accurate stormwater model to be developed, allowing urbanization effects to be directly incorporated into the stormwater model.

Integrated Cloud-Based Mapping
Utilize world-wide high-resolution 3D digital elevation terrain data from map services for automated watershed delineation, computation of time of concentration and lag time. Utilize web-based mapping services for aerial orthophotos, FEMA flood maps, watershed delineation, river centerline alignment, and more.

Digital Terrain Cross Section Cutting
Extract HEC-HMS routing reach cross sections from 3D digital elevation terrain data. Utilize AutoCAD Civil 3D surfaces, MicroStation surfaces, contours, TINs, DTMs, DEMs, survey points, LiDAR, and other external digital elevation terrain data. Automatically convert the extracted cross section to an equivalent 8-point cross section.

Automated Sequential Naming
For large models with numerous subbasins, routing reaches, junctions and other stormwater elements, the software will automatically name the elements based upon user-specified guidelines. The elements are named sequentially, by routing distance or incrementally.

Powerful 64-bit, Multi-Core Support
Handle larger projects with powerful 64-bit, multi-core, parallel processing support. This improves performance and stability for memory-intensive tasks—including running HEC-HMS simulations faster.

Automated TOC & Lag Time
Rapidly compute SCS time of concentration and lag time using flow segments of sheet flow, shallow concentrated flow and channel flow. The software will automatically compute overland flow lengths, slopes and travel times based upon digital terrain surfaces and land use coverages.

Automated Design Storm Assignment
The software will automatically determine the design storm and corresponding precipitation based upon the project location anywhere within the USA, Canada, Austria, and Germany. It will determine the design rainfall for the 1, 2, 5, 10, 25, 50, 100, and 500-year storms by querying the Precipitation Frequency Data Server based on the project location.

Automated CN & Green Ampt Computations
Quickly compute composite SCS curve numbers (CN), Green Ampt and percent imperviousness based upon aerial mapping, GIS polygon land use, or just by painting regions of land use on the screen. The software will automatically compute a weighted average of the different land uses and assign it to each subbasin.