PPT-Properties of Aquifers

Aquifer An aquifer is a wet underground layer of waterbearing permeable rock or unconsolidated materials from which groundwater can be usefully extracted using a water well Useful Definitions. 3 largesample properties CB 101 1 FINITESAMPLE PROPERTIES How an estimator performs for 64257nite number of observations Estimator Parameter Criteria for evaluating estimators Bias does EW Variance of you would like an estimator with a smaller varia Groundwater Hydraulics. Daene C. McKinney. Summary. Occurrence of Groundwater. Distribution of water in subsurface. Porous Medium. Porosity. Moisture Content. Particle Size. Capillary Pressure. Soil Moisture Characteristic Curves. Tripp Winters . Anisotropy is a common feature in water laid sedimentary deposits (fluvial, . clastic. lake, deltaic and glacial outwash). . Water lain deposits may exhibit anisotropy on the horizontal plain (X,Y if looking down from above). t. ests and tests in well fields. •Aquifers may be pumped at variable discharge rates either deliberately or due to characteristics of the pump. . •Aquifers can be pumped step-wise (always pumped but pumping rates vary) or may be pumped intermittently (not always pumped and pumping rates can vary). . Adam Forsberg. January 28, 2013. Until Now. Thickness constant. Water table horizontal. 3 Cases:. W. edge . shaped confined aquifers at . unsteady-state. S. loping . unconfined aquifers at . steady-state. Aquifers. ~ Any underground layer of rock or sediment that holds water.. ~ They can range in size from a small underground patch of permeable material to an area the size of several states.. Aquifers. Aquifers. ~ Any underground layer of rock or sediment that holds water.. ~ They can range in size from a small underground patch of permeable material to an area the size of several states.. Aquifers. porosity. – the amount of empty space in a rock or other earth substance; this empty space is known as pore space. Porosity is how much water a substance can hold.. vocabulary. word!. permeability . porosity. – the amount of empty space in a rock or other earth . substance. The higher the porosity, the more water it can hold.. . this empty space is known as pore space. Porosity is how much water a substance can hold.. Multi-tracer approach to understanding contaminant fate and transport in karst aquifers Amanda Laskoskie 1 , Dr. Dorothy Vesper 1 , Dr. Harry Edenborn 2 , Dr. Akram Alshawabkeh 3 , Dr. Ingrid Padilla POTENTIAL FOR LEAKAGE AMONG PRlNClPAL AQUIFERS IN THE MEMPHIS AREA TENNESSEE D Graham and W S Parks US GEOLOGICAL SURVEY Water-Resources Investigations Report 85-4295 Prepared in cooperation with the Artesian Prepared Artesian Water By G and P CONTRIBUTIONS Prepared UNITED UNITED UDALL SecretaryGEOLOGICAL DirectorFor CONTENTSPageAbstract ILLUSTKATIONSPLATE TABLESPage artesian CONTRIBUTIONS ARTESIA An . aquifer. is a wet underground layer of water-bearing permeable rock or unconsolidated materials from which groundwater can be usefully extracted using a water well. . Useful Definitions. Confining Layer – geologic unit with little or no intrinsic permeability. 1-Groundwater Hydrogeology , 1980, David K. Todd.. 2-Applied Hydrogeology , 1994, C.W. Fetter.. 3-Hydrogeology , 1966, Davis & De . Wiest. .. 4-Hydrology for Engineers , Geologists ,1997 ,Sergio E. Serrano..