Historical Water-Quality Data for the High Plains Regional Ground-Water Study Area in Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming, 1930-98.

摘要

The purpose of this report is to describe and assess historical (1930-98) water-quality data for the High Plains study area. This retrospective assessment gives an indication of where data are present or lacking and helps define the temporal and geographic extent of water-quality concerns, thereby providing a framework for the NAWQA study design. In this report, the compilation of historical data is described, including sources of data, data-base design, screening procedures and quality assurance of data, and characteristics of the resulting data base. The data base is included in digital form as a companion to this report. Statistical summaries are presented for selected constituents in the data base. Finally, for some constituents, temporal and spatial variability in concentrations is described, and variability is examined relative to human and environmental factors that might affect concentrations.