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GeoHECHMS®

HEC-HMS Workflow Automation Speeds-Up Your Engineering Projects
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Overview

What is GeoHECHMS?

GeoHECHMS greatly speeds up the creation, analysis, and review of stormwater models. It automates subbasin delineation, curve number (CN) computation using land use and soils maps, and lag time (time of concentration) computation. GeoHECHMS is a data wrapper to the industry-standard US Army Corps of Engineers HEC-HMS software using an AutoCAD compatible graphical user interface. Quickly compare different scenarios and alternatives, such as pre-development conditions with different post-development designs. Rapidly construct, design, analyze and compare detention and retention ponds. Both US and metric (SI) units are supported.

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System Requirements

Work Faster with Automated Workflows​

AutoCAD, MicroStation & ArcGIS User Interface

GeoHECHMS brings powerful 2D/3D graphical modeling to HEC-HMS hydrologic analysis within AutoCAD, Civil 3D, MicroStation, or ArcGIS. Transform complex watershed modeling into an intuitive visual workflow that streamlines data preparation, model development, and analysis for superior stormwater management results.

Work with Existing Models

Work seamlessly with existing data—load Army Corps HEC-HMS and legacy HEC-1 models, then georeference them to real-world coordinates using integrated tools. Leverage past investments while modernizing workflows, ensuring continuity across projects and eliminating costly model recreation from scratch.

Workflows

Easy to Learn and Use
Easy to Learn and Use: GeoHECHMS simplifies hydrologic modeling with an intuitive, easy-to-learn interface that automates time-consuming workflows. Build your HEC-HMS models faster through intelligent workflow automation that handles watershed delineation, data extraction, and model setup—letting you focus on engineering decisions, not tedious manual tasks.

Easy to Learn and Use

GeoHECHMS simplifies hydrologic modeling with an intuitive, easy-to-learn interface that automates time-consuming workflows. Build your HEC-HMS models faster through intelligent workflow automation that handles watershed delineation, data extraction, and model setup—letting you focus on engineering decisions, not tedious manual tasks.

Infinity loop icon representing unlimited undo and redo functionality in stormwater design software.
Unlimited Undo and Redo: Easily correct mistakes and explore design alternatives with full unlimited Undo and Redo capability. Make changes confidently knowing you can instantly reverse any edit, from simple subbasin edits to complex watershed delineations.

Unlimited Undo and Redo

Easily correct mistakes and explore design alternatives with full unlimited Undo and Redo capability. Make changes confidently knowing you can instantly reverse any edit, from simple subbasin edits to complex watershed delineations.

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Client Videos

Civil & Environmental Consultants

The workflow is similar to what we were used to before, but with CivilGEO it’s much more refined and more centric into one package…

Aquafor Beech Ltd.

GeoHECHMS allows me to bring in all the information I need, and greatly speeds things up…

Other Clients Videos

Watch video testimonials to hear stories from other clients.

Other Client Videos

Features

Automated HEC-HMS Workflows
Automated HEC-HMS Workflows: Accelerate stormwater projects with comprehensive automated workflows that handle watershed delineation, curve number computation, time of concentration and lag time analysis, imperviousness calculations, design storm assignment, detention pond sizing, and professional engineering report generation—transforming days of work into hours.

Automated HEC-HMS Workflows

Accelerate stormwater projects with comprehensive automated workflows that handle watershed delineation, curve number computation, time of concentration and lag time analysis, imperviousness calculations, design storm assignment, detention pond sizing, and professional engineering report generation—transforming days of work into hours.

GeoHECHMS interface demonstrating multi-model editing, with side-by-side views of a watershed hydrology model showing subbasins, streams, and flow paths over an aerial basemap, alongside a terrain-based river reach and junction layout used for integrated hydrologic and hydraulic analysis.
MDI Multiple Model Editing: Work on multiple projects without switching applications. GeoHECHMS lets you load, edit, and run multiple HEC-HMS models simultaneously—compare alternatives side-by-side, manage different project phases, or keep client work organized. Boost productivity with true multi-model and multi-project capability that standard HEC-HMS lacks.

MDI Multiple Model Editing

Work on multiple projects without switching applications. GeoHECHMS lets you load, edit, and run multiple HEC-HMS models simultaneously—compare alternatives side-by-side, manage different project phases, or keep client work organized. Boost productivity with true multi-model and multi-project capability that standard HEC-HMS lacks.

AutoCAD Civil 3D interface illustrating CAD and GIS integration, with HEC-HMS watershed subbasins and stream networks displayed as layered GIS data over high-resolution aerial imagery for site planning and hydrologic analysis.
CAD & GIS Integration: Work seamlessly within your preferred platform—AutoCAD, Civil 3D, MicroStation, or ArcGIS. GeoHECHMS integrates directly with CAD and GIS data, then exports completed models and results back to your design environment—eliminating data silos and maintaining unified project workflows.

CAD & GIS Integration

Work seamlessly within your preferred platform—AutoCAD, Civil 3D, MicroStation, or ArcGIS. GeoHECHMS integrates directly with CAD and GIS data, then exports completed models and results back to your design environment—eliminating data silos and maintaining unified project workflows.

GeoHECHMS interface showing automated watershed delineation, with color-coded subbasins, stream networks, junctions, and flow paths generated from terrain data and overlaid on an aerial basemap for watershed and runoff analysis.
Automated Watershed Delineation: Automatically delineate subbasins and watersheds from any elevation data source—Civil 3D surfaces, MicroStation surfaces, contours, TINs, DTMs, DEMs, LiDAR, and more. GeoHECHMS intelligently analyzes terrain to generate accurate drainage boundaries in minutes, eliminating hours of manual digitizing.

Automated Watershed Delineation

Automatically delineate subbasins and watersheds from any elevation data source—Civil 3D surfaces, MicroStation surfaces, contours, TINs, DTMs, DEMs, LiDAR, and more. GeoHECHMS intelligently analyzes terrain to generate accurate drainage boundaries in minutes, eliminating hours of manual digitizing.

Semi-Automated Detention Pond Design: Rapidly size and design detention and retention ponds to meet multiple design criteria. GeoHECHMS automates outlet structure development for various scenarios—balancing water quality requirements with storm event management—ensuring regulatory compliance while optimizing pond performance and minimizing construction costs.

Semi-Automated Detention Pond Design

Rapidly size and design detention and retention ponds to meet multiple design criteria. GeoHECHMS automates outlet structure development for various scenarios—balancing water quality requirements with storm event management—ensuring regulatory compliance while optimizing pond performance and minimizing construction costs.

Complete HEC-HMS Support: Develop and compute HEC-HMS stormwater results directly within GeoHECHMS, no external data processing required. Read and write standard US Army Corps HEC-HMS data files, ready for regulatory agency submittal. Modernize legacy projects by importing HEC-1 models and automatically upgrading them to current HEC-HMS standards.

Complete HEC-HMS Support

Develop and compute HEC-HMS stormwater results directly within GeoHECHMS, no external data processing required. Read and write standard US Army Corps HEC-HMS data files, ready for regulatory agency submittal. Modernize legacy projects by importing HEC-1 models and automatically upgrading them to current HEC-HMS standards.

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 cost effective, innovative, and environmentally sensitive designs.

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 cost effective, innovative, and environmentally sensitive designs.

GeoHECHMS subbasin report page showing detailed hydrologic results, including peak discharge, drainage area, curve number calculations, time of concentration and lag time tables, runoff volumes, and a precipitation–runoff hydrograph used for storm event analysis and reporting.
Professional Report Generation: Generate polished, agency-ready reports automatically in Microsoft Word and Excel. GeoHECHMS creates comprehensive documentation including subbasin results, time of concentration, curve numbers, runoff plots, and results tables—all formatted to your specifications for professional project deliverables.

Professional Report Generation

Generate polished, agency-ready reports automatically in Microsoft Word and Excel. GeoHECHMS creates comprehensive documentation including subbasin results, time of concentration, curve numbers, runoff plots, and results tables—all formatted to your specifications for professional project deliverables.

GeoHECHMS report generation workflow showing automated report assembly, with the report settings and project map preview in GeoHECHMS on the left and a multi-page Microsoft Word stormwater analysis report on the right containing maps, tables, and hydrograph plots.
Fully Customizable Report Templates: Tailor reports to meet any agency’s standard or client requirement. Customize layouts, add company branding, include specific data tables, and control what information appears. Save templates for consistent deliverables across all your projects.

Fully Customizable Report Templates

Tailor reports to meet any agency’s standard or client requirement. Customize layouts, add company branding, include specific data tables, and control what information appears. Save templates for consistent deliverables across all your projects.

GeoHECHMS subbasin results report showing hydrologic parameters and outputs, including peak discharge, rainfall and runoff depths, infiltration losses, time of concentration and lag time calculations, and a combined precipitation hyetograph and runoff hydrograph for storm event analysis.
Eliminate Manual Report Assembly: Stop copying and pasting results from HEC-HMS into documents. GeoHECHMS automatically populates your reports with current model data, graphs, and images. When your model changes, regenerate updated reports in seconds—not hours.

Eliminate Manual Report Assembly

Stop copying and pasting results from HEC-HMS into documents. GeoHECHMS automatically populates your reports with current model data, graphs, and images. When your model changes, regenerate updated reports in seconds—not hours.

Automated TOC & CN Computations: Automatically compute subbasin parameters including time of concentration (TOC), curve numbers (CN), and runoff coefficients. The software analyzes terrain data, land use, and flow paths to generate accurate hydrologic parameters in seconds—saving hours of manual calculations.

Automated TOC & CN Computations

Automatically compute subbasin parameters including time of concentration (TOC), curve numbers (CN), and runoff coefficients. The software analyzes terrain data, land use, and flow paths to generate accurate hydrologic parameters in seconds—saving hours of manual calculations.

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Additional Features

More Accurate Models: Build more accurate models with direct digital data integration. GeoHECHMS seamlessly incorporates field survey data, CAD drawings, and GIS datasets in multiple formats—ensuring your HEC-HMS models precisely reflect actual site conditions. Eliminate transcription errors and guesswork while saving hours of manual data entry.

More Accurate Models

Build more accurate models with direct digital data integration. GeoHECHMS seamlessly incorporates field survey data, CAD drawings, and GIS datasets in multiple formats—ensuring your HEC-HMS models precisely reflect actual site conditions. Eliminate transcription errors and guesswork while saving hours of manual data entry.

Seamlessly Share Data with HEC-RAS: Seamlessly migrate HEC-HMS results to HEC-RAS for accelerated workflows. Complete flood studies, bridge and culvert designs, dam failure analyses, and stream restoration projects faster with integrated data transfer—eliminating redundant data entry and ensuring consistency across hydrologic and hydraulic models.

Seamlessly Share Data with HEC-RAS

Seamlessly migrate HEC-HMS results to HEC-RAS for accelerated workflows. Complete flood studies, bridge and culvert designs, dam failure analyses, and stream restoration projects faster with integrated data transfer—eliminating redundant data entry and ensuring consistency across hydrologic and hydraulic models.

Work Directly on the Map: Overlay Google Maps, Bing Maps, or high-resolution aerial imagery directly onto HEC-HMS models. Quickly georeference existing models to background maps, AutoCAD/MicroStation drawings, or ArcGIS data—providing instant spatial context for better decision-making and presentation-ready visualizations.

Work Directly on the Map

Overlay Google Maps, Bing Maps, or high-resolution aerial imagery directly onto HEC-HMS models. Quickly georeference existing models to background maps, AutoCAD/MicroStation drawings, or ArcGIS data—providing instant spatial context for better decision-making and presentation-ready visualizations.

Purpose-Built Stormwater Design Tools: Purpose-built stormwater tools streamline design workflows from concept to completion. Automatically update subbasin boundaries when terrain changes, rapidly design detention ponds and outlet control structures, and analyze dam failures—all within an integrated environment that eliminates software switching and ensures model consistency.

Purpose-Built Stormwater Design Tools

Purpose-built stormwater tools streamline design workflows from concept to completion. Automatically update subbasin boundaries when terrain changes, rapidly design detention ponds and outlet control structures, and analyze dam failures—all within an integrated environment that eliminates software switching and ensures model consistency.

2D & 3D Viewing and Editing: View your stormwater model in both 2D plan view and immersive 3D to gain complete project understanding. Switch seamlessly between 2D plan view for precise design work and 3D visualization for verifying elevations, identifying conflicts, and communicating designs to stakeholders.

2D & 3D Viewing and Editing

View your stormwater model in both 2D plan view and immersive 3D to gain complete project understanding. Switch seamlessly between 2D plan view for precise design work and 3D visualization for verifying elevations, identifying conflicts, and communicating designs to stakeholders.

Stunning Visualizations: Create stunning visualizations of design alternatives to communicate project impacts clearly to stakeholders and communities. Publish HEC-HMS models directly to Google Earth for immersive 3D visualization—transforming complex hydrologic data into compelling, easy-to-understand presentations that facilitate faster approvals.

Stunning Visualizations

Create stunning visualizations of design alternatives to communicate project impacts clearly to stakeholders and communities. Publish HEC-HMS models directly to Google Earth for immersive 3D visualization—transforming complex hydrologic data into compelling, easy-to-understand presentations that facilitate faster approvals.

Included High-Resolution Elevation Data: Start modeling immediately with built-in high-resolution 1-meter elevation data covering the USA, Canada, Europe, and more. GeoHECHMS eliminates costly elevation data purchases and time-consuming imports—providing accurate, survey-grade terrain information ready to use the moment you launch your project.

Included High-Resolution Elevation Data

Start modeling immediately with built-in high-resolution 1-meter elevation data covering the USA, Canada, Europe, and more. GeoHECHMS eliminates costly elevation data purchases and time-consuming imports—providing accurate, survey-grade terrain information ready to use the moment you launch your project.

Included Land Use Coverage: Complete land use coverage is provided for the 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.

Included Land Use Coverage

Access comprehensive land use coverage for the USA, Canada, Europe, Australia, and beyond—built right in. Instantly compute composite curve numbers, time of concentration, lag times, and imperviousness without purchasing external datasets. Start modeling immediately with authoritative global data at your fingertips.

Included Imperviousness Coverage: GeoHECHMS includes global impervious surface datasets spanning the USA, Canada, Europe, Australia, and more. Eliminate time-consuming manual work and expensive data purchases. Accurately determine imperviousness percentages, refine curve number calculations, and improve runoff estimates using high-quality built-in coverage for your project location.

Included Imperviousness Coverage

GeoHECHMS includes global impervious surface datasets spanning the USA, Canada, Europe, Australia, and more. Eliminate time-consuming manual work and expensive data purchases. Accurately determine imperviousness percentages, refine curve number calculations, and improve runoff estimates using high-quality built-in coverage for your project location.

Integrated Cloud-Based Mapping: Access comprehensive cloud-based mapping services and authoritative data directly within GeoHECHMS—including high-resolution LiDAR elevation data, FEMA flood maps, watershed delineation, soil classifications, land use datasets, and more. Eliminate time-consuming data collection and start modeling immediately with everything integrated.

Integrated Cloud-Based Mapping

Access comprehensive cloud-based mapping services and authoritative data directly within GeoHECHMS—including high-resolution LiDAR elevation data, FEMA flood maps, watershed delineation, soil classifications, land use datasets, and more. Eliminate time-consuming data collection and start modeling immediately with everything integrated.

Digital Cross Section Cutting: Extract routing reach cross sections from diverse elevation data sources—Civil 3D surfaces, MicroStation surfaces, contours, TINs, DTMs, DEMs, LiDAR, and more. GeoHECHMS automatically converts extracted profiles to equivalent 8-point cross sections for streamlined HEC-HMS channel routing.

Digital Cross Section Cutting

Extract routing reach cross sections from diverse elevation data sources—Civil 3D surfaces, MicroStation surfaces, contours, TINs, DTMs, DEMs, LiDAR, and more. GeoHECHMS automatically converts extracted profiles to equivalent 8-point cross sections for streamlined HEC-HMS channel routing.

Automated Sequential Naming: Manage large models effortlessly with intelligent automatic element naming. The software names subbasins, reaches, junctions, and other elements based on your specifications—sequentially, by routing distance, or incrementally—maintaining consistent organization across hundreds of elements without tedious manual input.

Automated Sequential Naming

Manage large models effortlessly with intelligent automatic element naming. The software names subbasins, reaches, junctions, and other elements based on your specifications—sequentially, by routing distance, or incrementally—maintaining consistent organization across hundreds of elements without tedious manual input.

Automated Design Storm Assignment: Automatically retrieve precipitation depths and storm distributions for 1 to 500-year events across the USA, Canada, and many European countries. GeoHECHMS queries authoritative databases by project location—eliminating manual atlas lookups and ensuring regional code compliance for accurate, defensible hydrologic design.

Automated Design Storm Assignment

Automatically retrieve precipitation depths and storm distributions for 1 to 500-year events across the USA, Canada, and many European countries. GeoHECHMS queries authoritative databases by project location—eliminating manual atlas lookups and ensuring regional code compliance for accurate, defensible hydrologic design.

Automated TOC & Lag Time: Rapidly compute SCS time of concentration and lag time with automated flow segment analysis—sheet flow, shallow concentrated flow, and channel flow. The software automatically determines overland flow paths, lengths, slopes, and travel times from digital terrain and land use data—no manual calculations required.

Automated TOC & Lag Time

Rapidly compute SCS time of concentration and lag time with automated flow segment analysis—sheet flow, shallow concentrated flow, and channel flow. The software automatically determines overland flow paths, lengths, slopes, and travel times from digital terrain and land use data—no manual calculations required.

Automated CN & Green Ampt Computations: Compute composite SCS curve numbers, Green-Ampt parameters, and imperviousness using aerial mapping, GIS land use polygons, or simply painting regions on-screen. GeoHECHMS automatically calculates weighted averages across different land uses and assigns accurate values to each subbasin—effortlessly.

Automated CN & Green Ampt Computations

Compute composite SCS curve numbers, Green-Ampt parameters, and imperviousness using aerial mapping, GIS land use polygons, or simply painting regions on-screen. GeoHECHMS automatically calculates weighted averages across different land uses and assigns accurate values to each subbasin—effortlessly.

Critical Storm Analysis: Perform simultaneous critical storm analysis in minutes across multiple storm frequencies, distributions, and durations. The software automatically evaluates all combinations to identify the critical design storm—eliminating manual iteration and saving hours of analysis time.

Critical Storm Analysis

Perform simultaneous critical storm analysis in minutes across multiple storm frequencies, distributions, and durations. The software automatically evaluates all combinations to identify the critical design storm—eliminating manual iteration and saving hours of analysis time.

FEMA Approved Software: GeoHECHMS provides complete support for HEC-HMS and is FEMA-approved for National Flood Insurance Program (NFIP) stormwater and flood studies, ensuring regulatory compliance and acceptance by federal agencies, municipalities, and reviewing authorities nationwide.

FEMA Approved Software

GeoHECHMS provides complete support for HEC-HMS and is FEMA-approved for National Flood Insurance Program (NFIP) stormwater and flood studies, ensuring regulatory compliance and acceptance by federal agencies, municipalities, and reviewing authorities nationwide.

Water resources engineer providing expert technical support for stormwater modeling and design software.
Expert Technical Support: Extend your engineering team with unlimited 24/7 toll-free support from experienced water resource engineers—not just software technicians. Get expert guidance on complex hydrology problems, modeling challenges, and design questions whenever you need it, at no additional cost.

Expert Technical Support

Extend your engineering team with unlimited 24/7 toll-free support from experienced water resource engineers—not just software technicians. Get expert guidance on complex hydrology problems, modeling challenges, and design questions whenever you need it, at no additional cost.

AI-powered engineering assistance illustrated by a digital brain and processor, representing real-time support for stormwater modeling and simulation.
AI-Powered Engineering Assistance: Leverage AI-powered engineering assistance for real-time support with project review, simulation troubleshooting, and modeling questions. Get instant solutions to technical challenges and guidance based on engineering best practices—helping you work faster and more confidently.

AI-Powered Engineering Assistance

Leverage AI-powered engineering assistance for real-time support with project review, simulation troubleshooting, and modeling questions. Get instant solutions to technical challenges and guidance based on engineering best practices—helping you work faster and more confidently.

Interactive training and engineering assistance interface representing free training and expert guidance for stormwater modeling software.
Free Training & Engineering Project Assistance: Receive complimentary training tailored to your projects along with expert guidance from water resource engineers who support you from initial setup through project completion. Ensure your team is immediately productive and equipped with best practices for successful, efficient project execution.

Free Training & Engineering Project Assistance

Receive complimentary training tailored to your projects along with expert guidance from water resource engineers who support you from initial setup through project completion. Ensure your team is immediately productive and equipped with best practices for successful, efficient project execution.

64-bit multi-core processor illustrating high-performance computing for large and complex stormwater modeling projects.
Powerful 64-bit, Multi-Core Support: Handle larger, more demanding projects efficiently with powerful 64-bit, multi-core, parallel processing capabilities. Process extensive stormwater networks, perform complex hydrologic calculations, and run critical storm analyses significantly faster.

Powerful 64-bit, Multi-Core Support

Handle larger, more demanding projects efficiently with powerful 64-bit, multi-core, parallel processing capabilities. Process extensive stormwater networks, perform complex hydrologic calculations, and run critical storm analyses significantly faster.

What makes GeoHECHMS different?

Here’s a quick overview of how our features compare to our competitors.

Capability GeoHECHMS HEC-HMS PondPack StormCAD WMS Hydrology Studio
Automated TOC & CN Calculations
Automated TOC & Lag Time Calculations
Automated CN & Green Ampt Calculations
Automated Watershed Delineation
Powerful Report Generation Limited Limited
Automated Design Storm Assignment
Built-In Elevation Data Sources Limited
Integrated Terrain Modeling Limited
Automated GIS Mapping Functions Limited
Integrated 2D / 3D Viewing & Editing
CAD & GIS Integration Limited Limited Limited Limited
24×7 Toll Free Technical Support Limited
Free Onboard Training
Free Engineering Project Assistance

Client Videos

Civil & Environmental Consultants

The workflow is similar to what we were used to before, but with CivilGEO it’s much more refined and more centric into one package…

Aquafor Beech Ltd.

GeoHECHMS allows me to bring in all the information I need, and greatly speeds things up…

Other Clients Videos

Watch video testimonials to hear stories from other clients.

Other Client Videos

Client Testimonials

Case Studies

Other Case Studies

Civil & Environmental Consultants, Inc.

Water resource experts and leads at CEC, Matt Gramza and Steve Casey, sat down with CivilGEO’s engineering director, Chris Maeder…

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Aquafor Beech Ltd.

The compatibility of GeoHECRAS with GIS and other applications like PCSWMM makes the pre- and post-processing aspects….

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Stormwater Management Consulting

The use of GeoHECRAS for floodplain delineation has resulted in significant time and cost savings as well. Skupien notes that….

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