Charles Schalk

Charles began his career in 1990 in the Ohio WSC, working on hydrogeologic flow modeling and database management. After moving to Maine in 2003, he worked on flood-insurance studies, algal bloom issues, and road-salt investigations. Charles joined the Office of Groundwater in 2015 and the Hydrologic Networks Branch of OSD in 2018, where he is the national groundwater networks coordinator.



  • M.S. degree, The Ohio State University, Department of Agricultural Engineering, 1990
  • B.S. degree, The Ohio State University, Department of Agricultural Engineering, 1988, cum laude with distinction 

Selected Work History

  • 2018-present - National Groundwater Networks Coordinator, Observing Systems Division, Hydrologic Networks Branch
  • 2015-2018 - Hydrologist, U.S. Geological Survey, Office of Groundwater
  • 2003-2015 - Hydrologist, U.S. Geological Survey, Augusta, Maine
  • 1990-2003 - Hydrologist, U.S. Geological Survey, Columbus, Ohio
  • 1988-1990 - Graduate fellow, Ohio Agricultural Research and Development Center and The Ohio State University

Selected Work Experience

  • 2015-present (U.S. Geological Survey, Water Mission Area)
    • Manage funding and growth of the Climate Response Network and participate in management of the National Groundwater Monitoring Network
    • Develop baseflow computation capabilities in Groundwater Watch
    • Update GW1636 (Groundwater data processing) training course for use with AQUARIUS
    • Groundwater/surface-water interaction team member for Next Generation Water Observing Systems (NGWOS) effort in the Delaware River basin
    • Represent Water MIssion Area on the federal agencies' soil moisture working group
    • Work with the NWIS program on data-delivery tools and other modernization efforts
  • 2003-2015 (U.S. Geological Survey, Maine):  
    • Cochairman of the Ground-Water Users Group, working with users and NWIS staff to oversee the development of the Ground-Water Site Inventory, a USGS national ground-water database.
    • Worked with the Office of Groundwater to present ground-water related tools and developments to the user community.
    • Proposed and managed projects, including primary production of algae in a river system in northern Maine and road-salt contamination of groundwater in fractured rocks.
    • Provided geographical information systems (GIS) support for many projects. 
    • Participated in and managed scoping efforts for flood studies in Maine.
    • Worked closely with State agencies to compile flood-related information and prepare and hold meetings with local managers and officers. 
  • 1990-2003 (U.S. Geological Survey, Ohio)
    • Technical liaison with U.S. Environmental Protection Agency, Region V; U.S. Air Force Aeronautical Systems Center, Wright-Patterson Air Force Base; and contractors doing hydrogeological and contamination studies in southwestern Ohio. 
    • Proposed and managed projects, including particle tracking at a municipal well field, nonjurisdictional delineation of wetlands, statewide estimates of ground-water vulnerability, development of digital GIS databases, and sampling for animal antibiotics in the environment. 
    • Helped construct several groundwater-flow models (phytoremediation project; municipal water use; contamination pathways).
    • Sampled ground and surface water in a haz-waste Level D environment. 
    • Measured saturated hydraulic conductivity by the slug method and unsaturated hydraulic conductivity by three methods.
    • Lectured on groundwater-flow modeling and GIS applications. 
    • Populated and managed a large relational database for an extensive water-quality project. Included data entry, handling, loading, and quality-assuring; developed applications (in C) for reporting purposes.