Introducing the National Groundwater Conditions web application

A new, experimental application for viewing groundwater levels with historical context and for generating site-level reports.

Summary

We are excited to release an experimental web application that provides a searchable map interface and at-a-glance site summary statistics and visuals of current groundwater levels relative to historic values. This application provides some of the core functionality available in the former Groundwater Watch application.

Overview of the National Groundwater Conditions application

Groundwater is a critical resource for many people, and the USGS generates groundwater level data for thousands of sites across the United States and outlying territories. The ability to put current groundwater data into a long-term historical context is valuable in understanding trends in groundwater use at a particular monitoring location, region, or at the national scale. In 2022, the web application Groundwater Watch was shut down and a long-term replacement is in development. Here, we introduce National Groundwater Conditions, a national-scale web application that maps active groundwater levels and enables users to explore site-level groundwater data with a historical context. The application provides information for understanding long-term trends in groundwater availability at a particular site and for managing critical groundwater resources. It delivers the core functionality that was previously available in Groundwater Watch.

Access the application here , or at the following link: https://rconnect.usgs.gov/gwapp/ .

This tool is being released as an experimental product. In the future, the functionality available in the application will be integrated into our existing USGS water applications such as the National Water Dashboard and Monitoring Location Pages; these applications have a wealth of additional mapping features and functionality.

How to use the web application

The National Groundwater Conditions application has a national map to view current groundwater levels relative to historic values for all actively monitored sites. It includes data from USGS sites as well as non-USGS sites that are part of the National Groundwater Monitoring Network (NGWMN).

The page opens with a popup window that provides news and guidance on using the application. Users can go back to these references any time while using the application by toggling to the About tab. Once loaded, a map will appear. Use the ‘Map Controls’ pane on the left to filter the national dataset to sites of interest. Users can filter based on state/territory 2-letter code, national aquifer, data type, current flow percentile class, inclusion in the Climate Response Network , or recency of data (default is 730 days). The data presented in this map are updated daily.

For example, a user may be interested in sites located in Kansas with groundwater levels that are at or below the 25th percentile of mean historic levels. Scroll down below the map to view a Summary Table listing the sites that meet the search criteria.

Clicking on a colored dot opens a pop-up window with location-specific information including site name, most recent depth to water level, and percentile bin. There are also links to additional location information, including:

• A link to the WDFN Monitoring Location page
• A ‘Site Page’ containing a monitoring location report, which includes monthly groundwater level statistics graphs and a site statistics summary table
• Locations that are part of the National Groundwater Monitoring Network will have a link to the location’s NGWMN page

The links are also available in the Summary Table.

View groundwater level statistics for a monitoring location

The Site Page provides location metadata and groundwater levels summary statistics in graphical and tabular formats. These visuals are designed to give users quick access to the current (within the past 24 hours) groundwater level conditions with comparisons to monthly historic means for rapid assessment and decision-making. The tables and graphs are exportable for creating reports and presentations, and the Site Page itself has a stable URL to simplify sharing and collaboration.

The technical details

The application performs calculations and generates graphics using aggregated groundwater levels data and statistics obtained from an R package, called Hydrologic Analysis Package (HASP), which can aggregate individual site visit groundwater levels (e.g., discrete) data with data from a deployed sensor (e.g., continuous) into a single record. This enables viewing a longer time series data set for many sites. For more information on HASP, check out this blog post .

The Climate Response Network

The mapping application includes a filter for sites that are part of the Climate Response Network (CRN). This is a network of wells and springs to monitor the effects of droughts and other climate variability on groundwater levels.

Let us know what you think!

Please let us know if this tool is serving your needs. If you have any questions or run into technical problems, please contact us at comptools@usgs.gov .

We often seek volunteers to help us test our products. If you are interested in getting involved, please contact us at wdfn_usabilitytesting@usgs.gov .

Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.