The investigation of sediment deposition in Lake Corpus Christi was initiated by researching the published and unpublished sediment data for the 1972-85 water years for stations located upstream and downstream of the lake. Regression analysis was used to fill in the missing data. Data were tabulated for monthly discharge (acre-feet) and sediment load (tons, acre-feet, and percent by weight). Yearly totals and cumulative averages were computed and included in the tables. An estimated 10,300 acre-feet (wet volume) of sediment has been deposited in Lake Corpus Christi during the 14-year period of record (1972-85), an average of 736 acre-feet per year (wet volume). An earlier study by the U.S. Soil Conservation Service, based on 1942-48 changes of lake bottom contours, estimated that 736 acre-feet per year of suspended sediment had entered Lake Corpus Christi during that 6-year period.
Introduction-Purpose and scope Description of Cedar Creek Reservoir and its environment-Location of sampling sites Water qua!ity Thermal stratification 6 Di ssol ved oxygen Dissolved trace elements Iron and manganese Other trace elements Total nitrogen and total phosphorus-Dissolved solids, chloride, sulfate, and hardness Suitability of water as a public supply Summary and conclusions Sel ected references 30
A geochemical survey of the Big Sioux aquifer was undertaken to: (1) Make an estimate of the quality of the water in the aquifer, (2) determine if there are any water-quality problems in the aquifer, and (3) design a water-quality monitoring network to monitor changes in present and potential water-quality problems. For most agricultural uses, the water in the Big Sioux aquifer is of acceptable quality. However, in some locations, the ground water is either marginally acceptable or unfit for human use. The major water-quality problem is the high nitrate concentrations (geometric mean of 3.9 and a maximum concentration of 120 milligrams per liter as nitrogen) found in many domestic water supplies. The fact that samples taken from observation wells located by roads away from houses and barnyards show lower concentrations of nitrate (geometric mean of 0.35 and a maximum concentration of 22 milligrams per liter as nitrogen) indicates that the source of nitrate pollution is probably localized and due to human or barnyard sewage. A monitoring network is proposed consisting of at least: (1) Three wells adjacent to domestic wells, (2) three wells about 1,000 feet away and down the potentiometric gradient from domestic wells, and (3) three wells at least 3,000 feet from any source of pollution. This monitoring network would provide information on changes in both localized nitrate pollution and regional trends in nitrate pollution or other selected water-quality parameters.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.