Download or read book Surface Geophysical Techniques for Aquifers and Wellhead Protection Area Delineation written by United States Environmental Protection Agency (EPA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-22 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface Geophysical Techniques for Aquifers and Wellhead Protection Area Delineation

Download or read book Surface Geophysical Techniques for Aquifers and Wellhead Protection Area Delineation written by Paul Violette and published by . This book was released on 1987 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Surface Geophysical Techniques for Aquifers and Wellhead Protection Area Delineation written by Paul Laviolette and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Guidelines for Delineation of Wellhead Protection Areas written by and published by . This book was released on 1987 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Literature Review of Methods for Delineating Wellhead Protection Areas written by and published by . This book was released on 1998 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Delineation of Wellhead Protection Areas in Fractured Rocks written by and published by . This book was released on 1991 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Wellhead Protection Strategies for Confined Aquifer Settings written by and published by . This book was released on 1991 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Applicability of Wellhead Protection Area Delineation to Domestic Wells written by Marilyn H. Ginsberg and published by . This book was released on 1995 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Model Assessment for Delineating Wellhead Protection Areas written by Paul Van der Heijde and published by . This book was released on 1988 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Preliminary Wellhead Protection Area Delineation written by William H. McLemore and published by . This book was released on 1999 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Delineation of Wellhead Protection Areas Using Particle Tracking Analysis and Hydrogeologic Mapping Northern Anne Arundel County Maryland written by John M. Wilson and published by . This book was released on 1995 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Application and Evaluation of Wellhead protection Area Delineation Methods written by Jeffrey K. Bates and published by . This book was released on 1994 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Protocol for Delineation of Wellhead Protection Areas for Municipal Groundwater Supply Wells Under Direct Influence of Surface Water written by Ontario. Ministry of the Environment and published by . This book was released on 2001 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Delineation of Wellhead Protection Areas in Semiconfined Aquifers Using Semianalytical Methods written by George Stewart Roadcap and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The wellfields at Richwood, Ohio are completed in a fractured dolomite aquifer that is overlain by clay-rich till containing sand and gravel lenses. The five wells comprising the "old" and "new" wellfields are capable of producing 3 million gallons per day. Geologic logs and time-drawdown data from pumping tests performed at the wellfields indicate that the dolomite aquifer is semiconfined and behaves according to classic leaky-confined theory. A computer program was developed to calculate drawdowns and hydraulic heads at the intersections of an areal rectangular grid based on the Hantush-Jacob equation. The program incorporates the effects of well interference, the use of image wells, and the effects of regional hydraulic gradients. Based on site-specific values of T, S, and K, a semianalytical regional model surrounding the wellfields was constructed by computing drawdowns at grid intersections and subtracting these values from regional values of hydraulic head representing the prepumping potentiometric surface. Predicted heads agree favorably (+- 0.5 feet) with measured heads, indicating that the model is a good predictor of the hydrologic response of the wellfields to pumping stress. The predicted heads in conjunction with an estimated effective porosity value were used in a particle-tracking analysis to delineate the 1, 2, and 5-year capture areas surrounding each wellfield. The acres were determined to cover 42, 75, and 120 acres at the old wellfield, and 42, 66, and 110 acres at the new wellfield. Predicted pathlines and capture areas correspond to estimated traveltimes and known locations of nitrogen contaminating the old wellfield. The computed traveltime-related capture areas surrounding the new wellfield do not encompass any of the known sources of ground-water contamination in the area."

Download or read book Wellhead Protection Area Delineation for a Small Community in a Buried Valley Setting Near Waynesville Ohio written by Kris Fields and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Dakin Estates, a small community located approximately 1.5 miles south of Waynesville, Ohio, obtains its drinking water from the Little Miami River (LMR) buried valley aquifer. The aquifer is composed of permeable sands and gravels overlain by a laterally continuous, clay-rich confin-ing unit. While present water demand is easily satisfied by the aquifer, its inherent potential for contamination poses a serious threat to the community. Recognizing the detrimental effects of water pollution, the owner of Dakin Estates has elected to implement a Wellhead Protection (WHP) Program. The WHP program is designed to protect the drinking water of communities dependent upon groundwater. Hydrogeologic data was obtained from maps, well logs, previous and similar studies, outcrops, pump tests, and monitoring of groundwater and surface water levels. These data were used to formulate a conceptual model that was tested with a numerical flow model using the United States Geological Survey's (USGS) MODFLOW, a modular, finite-difference, groundwater flow model. Because LMR exerts a strong influence on groundwater levels in the vicinity of Dakin Estates, model calibration was based on fluctuation of groundwater levels corresponding to change in river stage. Water chemistry analyses were performed using the USGS PHREEQC aqueous geochemical mixing model. The geochemical results provide an independent assess-ment of the validity of the conceptual and numerical models. MODPATH, an advective transport particle-tracking model, was used to delineate the area contributing water to the pumping well for a specified time period. The results of this study indicate the Wellhead Protection Area (WHPA) extends upgradient, roughly paralleling the strike of the valley, without encountering significant flow boundaries. Results of the geochemical analyses suggest significant interaction between groundwater and surface waters is occurring, likely upstream from the WHPA. The water obtained by Dakin Estates is a mixture of underflow from upstream, infiltration of surface water, and aerial re-charge. Predictive simulations indicate the aquifer is capable of yielding projected increase of future demand.

Download or read book Delineation of Wellhead Protection Areas Using Groundwater Flow Models written by Syed Mohammed Ahsan and published by . This book was released on 1992 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Case Studies in Wellhead Protection Area Delineation and Monitoring written by Beth A. Moore and published by . This book was released on 1993 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt: