Data collected from May 1991 through September 1993 to determine seasonal fluctuations in ground-water levels and to estimate directions of ground-water flow in the saturated zone at selected study sites at the Iowa Management Systems Evaluation Area in the Walnut Creek watershed is presented. The Walnut Creek watershed is located on glacial deposits of Wisconsin Age in central Iowa and includes about 20 square miles. The upper glacial materials that contain the water table appear to be supraglacial till rather than basal glacial tills and contain both oxidized and unoxidized zones. A total of 102 observation wells were installed at 38 well nest locations. Descriptions of the observation wells drilled, the range of water-level fluctuation, and the estimated direction of ground-water movement at each of seven study sites in the watershed are provided. Diagrams of each study site show the location of observation wells and the estimated direction of ground-water flow for a selected date. Data tables include descriptive well logs, well-construction data, and water-level measaurements made between May 1991 and September 1993.
Additional publication details
USGS Numbered Series
Ground-water levels and flow at selected study sites in the Walnut Creek Management System Evaluation Area, Boone and Story counties, Iowa, 1991-93
Water-Resources Investigations Report
U.S. Geological Survey ;
Earth Science Information Center, Open-File Reports Section [distributor],