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NWDTW 2026
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Thursday, July 23
 

10:00am CDT

Groundwater Workgroup Open-Forum
Thursday July 23, 2026 10:00am - 11:20am CDT
The goal of this open-forum/listening session is to provide groundwater expertise for Q&A and to promote interaction and networking within the USGS groundwater community
Speakers
avatar for Lance Gruhn

Lance Gruhn

Hydrologist, USGS
Lance Gruhn is a Hydrologist stationed in Iowa City, Iowa and is the groundwater technical and field support lead for the Hydrologic Networks Branck of the USGS Water Resources Mission Area. Lance coordinates the Groundwater Data Processing class and the Groundwater Field Techniques... Read More →
Thursday July 23, 2026 10:00am - 11:20am CDT
Moody Music - Room 1003 (150 Theater / Thurs Only)

1:00pm CDT

Measuring Groundwater flow velocity and direction: Project investigations, long term deployments, and Research and Development of New Multi-dimensional Heat Pulse Flowmeters
Thursday July 23, 2026 1:00pm - 2:20pm CDT
Groundwater flow meters that measure horizontal flow direction and velocity have been used by the USGS in a variety of investigations across the country. Traditionally, these instruments required on-site operation and supported investigative studies of contaminant plumes (such as TCE and PFAS) to aid in site characterization and remedial planning, as well as to evaluate aquifer test responses and production well influence. As part of the NGWOS Illinois Basin Study, groundwater flow meters have been deployed for long-term, telemetered monitoring at two testbed sites to help characterize groundwater flow and direction to assess groundwater–surface water interactions between streams and nearby agricultural areas. Recently, as part of the NGWOS Research and Development sub-program, work has commenced to develop a heat pulse flowmeter that is capable of measuring flow direction and velocity in 3-dimensional space rather than being limited to the horizontal plane. This presentation will provide an overview of available technologies, guidance on proper deployment and operation, case studies, best management practices, and research and development of a new multi-dimensional instrument.
Speakers
avatar for Lance Gruhn

Lance Gruhn

Hydrologist, USGS
Lance Gruhn is a Hydrologist stationed in Iowa City, Iowa and is the groundwater technical and field support lead for the Hydrologic Networks Branck of the USGS Water Resources Mission Area. Lance coordinates the Groundwater Data Processing class and the Groundwater Field Techniques... Read More →
avatar for David Lampe

David Lampe

Supervisory Hydrologist, USGS OKI WSC

MH

Matt Hardebeck

Hydrologist, United States Geological Survey
Thursday July 23, 2026 1:00pm - 2:20pm CDT
Moody Music - Room 1003 (150 Theater / Thurs Only)
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