Below is a list of frequently asked questions for Hydro GeoAnalyst. If you have a question that isn’t listed here, please contact our technical support team (

Click here to access the Hydro GeoAnalyst Online User’s Manual.

Please visit our website to view a schedule of upcoming webinars for Hydro GeoAnalyst and other software products. If you do not see a time that is suitable for you, or there are currently no webinars scheduled, please complete the request form and a representative will be in contact with you to arrange a webinar.

Alternatively, you are welcome to view a recording of our Hydro GeoAnalyst Introductory webinar, at your own convenience. The recording is available on our YouTube Channel.

If you have installed Hydro GeoAnalyst, the demonstration tutorial is built into the software and can be installed from the Project Menu. Please view the online help documentation for additional details.
In order to use the water quality analysis feature within Hydro GeoAnalyst, you must first have AquaChem installed on the local machine. With your project open in Hydro GeoAnalyst, select Modules > AquaChem (or select the AquaChem icon from the toolbar). Hydro GeoAnalyst will check the current project database to see if the Geochemistry Extension has been added – if this has not been added you will be prompted to add this extension. Once the Geochemistry Extension has been added to the project database, AquaChem will launch displaying the selected data.

Please view the online help documentation for additional details on using the AquaChem (Water Quality Analysis) feature, or feel free to view a short video on this process available on our YouTube channel.

In order to use the Aquifer Test analysis feature, you must first have Aquifer Test 4.1 or later installed on the local machine. With your project open in Hydro Geo Analyst, select Modules > Aquifer Test (or select the Aquifer Test icon from the toolbar). This will launch the Pumping Test Analysis window. For additional information on completing the Pumping Test Analysis please view the online help documentation. Once all the required fields have been defined, click the Analyze button to send the data to Aquifer Test.
Hydro GeoAnalyst can be used to build the conceptual model layers for a Visual MODFLOW Flex model. You may also use the data in Hydro GeoAnalyst to import observation wells into Visual MODFLOW’s Classic Interface.

Creating Conceptual Model Layers:

In Hydro GeoAnalyst, you can query the database to determine layers with different lithology and export this data for use in Visual MODFLOW Flex.

For example, the HGA demonstration database can be queried to determine the bedrock elevation. To query the bedrock surface, we will need to do the following calculation:

Ground Surface (station.elevation) – Top of Bedrock (depth to shale or limestone). In the Query Builder this would be represented by:

Select Max Function and expression, lithology.from_ with the Alias name Top of Bedrock

A condition may then be applied for soil_type = limestone

You may need to adjust the query according to your project fields/data. You may then execute the query. Once the database has been queried to determine the bedrock elevation, a gridded surface can be created and used in Visual MODFLOW. In HGA, load the query into the Map Manager and create a gridded surface of the data (.grd file). For additional information on creating gridded data please view the online help documentation.

Export Model Layers. You can choose which layers to export and from which cross sections. The more cross sections you define, the more points you have for defining the layer interfaces. The model layers will be exported as a text file with x, y and z values. For additional details on creating your geological layer interpretations, please view the online help documentation.

In Hydro GeoAnalyst, you can create a calibration point file by creating a query with the following columns, for example, to import observation wells:

NameXYScreenMeasure Point ElevationStop TimeHead

Once you have created the appropriate query, you may export the data to an .xls or .txt file to import into the Visual MODFLOW Classic Interface.

In Visual MODFLOW, you will need to set up the model with the appropriate model or world coordinates so that the files imported from HGA will correspond with these coordinates. Create the model and import the model layers and calibration points from HGA into Visual MODFLOW.

If you are restoring your database from a backup, or are opening a project for the first time you will need to ensure that you have the entire project directory on your local machine along with a copy of the Backup File (*.BAK). From the Project Menu, select Open from Backup, this will launch the Restore Database dialogue. Specify the desired SQL Server, and the location of the Project (*.VBH) and Backup file to be restored and press the OK button to open the project.

Additional information on backing up your database can be found in the online help documentation.