Vertical Gradients in Water Chemistry and Age in the Northern High Plains Aquifer, Nebraska, 2003 : Usgs Scientific Investigations Report 2006-5294. Eric Lockaby
The northern High Plains aquifer is the primary source of water used for domestic, industrial, and irrigation purposes in parts of Colorado, Kansas, Nebraska, South Dakota, and Wyoming. Despite the aquifer's importance to the regional economy, fundamental ground-water characteristics, such as vertical gradients in water chemistry and age, remain poorly defined. As part of the U.S. Geological Survey's National Water-Quality Assessment Program, water samples from nested, short-screen monitoring wells installed in the northern High Plains aquifer were analyzed for major ions, nutrients, trace elements, dissolved organic carbon, pesticides, stable and radioactive isotopes, dissolved gases, and other parameters to evaluate vertical gradients in water chemistry and age in the aquifer. Chemical data and tritium and radiocarbon ages show that water in the aquifer was chemically and temporally stratified in the study area, with a relatively thin zone of recently recharged water (less than 50 years) near the water table overlying a thicker zone of older water (1,800 to 15,600 radiocarbon years). In areas where irrigated agriculture was an important land use, the recently recharged ground water was characterized by elevated concentrations of major ions and nitrate and the detection of pesticide compounds. Below the zone of agricultural influence, major-ion concentrations exhibited small increases with depth and distance along flow paths because of rock/water interactions. The concentration increases were accounted for primarily by dissolved calcium, sodium, bicarbonate, sulfate, and silica. In general, the chemistry of ground water throughout the aquifer was of high quality.
Read online Vertical Gradients in Water Chemistry and Age in the Northern High Plains Aquifer, Nebraska, 2003 : Usgs Scientific Investigations Report 2006-5294
Buy and read online Vertical Gradients in Water Chemistry and Age in the Northern High Plains Aquifer, Nebraska, 2003 : Usgs Scientific Investigations Report 2006-5294
Download and read Vertical Gradients in Water Chemistry and Age in the Northern High Plains Aquifer, Nebraska, 2003 : Usgs Scientific Investigations Report 2006-5294 for pc, mac, kindle, readers
Download to iPad/iPhone/iOS, B&N nook Vertical Gradients in Water Chemistry and Age in the Northern High Plains Aquifer, Nebraska, 2003 : Usgs Scientific Investigations Report 2006-5294 ebook, pdf, djvu, epub, mobi, fb2, zip, rar, torrent
Other files:
Illuminate : Ignite Change Through Speeches, Stories, Ceremonies and Symbols download pdf
conceptdraw pro v9 mac torrent
Diffusion Processes download pdf
Timber Physics : Preliminary Report (Classic Reprint) pdf
La faz cambiante del sacerdocio : sobre la crisis anÃmica del sacerdote download pdf
ON LOCATION GRADE 10 TEACHERS EDITION ebook
