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

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

Selected Work Experience

  • 2015-present (U.S. Geological Survey, Water Mission Area)
    • Managed funding and growth of the Climate Response Network and participate in management of the National Groundwater Monitoring Network
    • Developed baseflow computation capabilities in Groundwater Watch
    • Coordinated and taught a groundwater data processing training course
    • Groundwater/surface-water interaction team member for Next Generation Water Observing Systems (NGWOS) effort in the Delaware River basin
    • Represented WMA on the federal agencies' soil moisture working group
    • Worked 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
    • Worked with the Office of Groundwater to present groundwater related tools and developments to the user community
    • Managed projects, including primary production of algae in a river system and road-salt contamination of groundwater in fractured rocks
    • Provided geographical information systems (GIS) support
    • Managed scoping efforts for flood studies in Maine
  • 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
    • Managed projects 
    • Constructed groundwater-flow models for phytoremediation, 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
    • 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