Download or read book Isotopic Discrimination of Aquifer Recharge Sources Subsystem Connectivity and Flow Patterns in the South Fork Palouse River Basin Idaho and Washington USA written by Kyle A. Duckett and published by . This book was released on 2019 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stable Isotope Analysis of Surface Water and Precipitation in the Palouse Basin Hydrologic Tracers of Aquifer Recharge written by Nathan Moxley and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterizing Groundwater Recharge written by J. Moran and published by IWA Publishing. This book was released on 2004-01-01 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of the project was to demonstrate the value of age-dating and isotopic tracers in characterizing the flow dynamics and water quality changes in a complex groundwater domain that includes high capacity municipal pumping wells, a geologic fault, and artificial recharge facilities with deep lake-like recharge ponds. Characterizing water quality changes during recharge and transport in groundwater was also an objective of this investigation. Below (west of) the Hayward Fault (BHF), water ages correlated well with aquifer layer sequence. BHF tracers did not reach the BHF wellfield within the time frame of the experiment. Above (east of) the fault, (AHF) tracers reached the targeted wellfield in only 60 days, indicating substantial heterogeneity and a fast travel time along preferential pathways compared to the average travel time of 2+ years indicated by age-dating and more classical estimating methods. A reconnaissance of water quality, conducted concurrently with the tracer studies, suggested certain water quality improvements occurring in either the pond sediment or the near-pond aquifer media. Variations in groundwater age depended on location and depth. A survey of natural isotopes indicated mixing of young and older water in wells, increasing age with depth of aquifer layer, and possible dissolution of carbonate minerals. AHF tracer experiments, along with other analysis, suggested that tracers probably percolated preferentially at shallow depths in the pond near the shoreline. Much of the tracer remained in deep pond water over time, increasing residence time in down-gradient wells. The tracer studies provided evidence of preferential pathways and heterogeneity in the AHF aquifer and a fast minimum travel time to the AHF wellfield. The tracer added to BHF ponds was detected in just two monitoring wells, but not at the BHF wellfield over the 10-month period. An AHF tracer from a small pond spanning the fault did, however, appear at the BHF wellfield. BHF pond water flows mainly to distal portions of the groundwater basin, or reaches the wellfield over a slow, circuitous route. Originally published by AwwaRF for its subscribers in 2003 This publication can also be purchased and downloaded via Pay Per View on Water Intelligence Online - click on the Pay Per View icon below

Download or read book Water Quality and Environmental Isotopic Analyses of Ground water Samples Collected from the Wasatch and Fort Union Formations in Areas of Coalbed Methane Development written by Timothy T. Bartos and published by . This book was released on 2002 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geochemistry and Isotope Hydrology of Representative Aquifers in the Great Basin Region of Nevada Utah and Adjacent States written by James M. Thomas and published by . This book was released on 1996 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Distribution of Isotopic and Environmental Tracers in Groundwater Northern Ada County Southwestern Idaho written by Candice Adkins and published by CreateSpace. This book was released on 2014-08-01 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Residents of northern Ada County, Idaho, depend on groundwater for domestic and agricultural uses. The population of this area is growing rapidly and groundwater resources must be understood for future water-resource management. The U.S. Geological Survey, in cooperation with the Idaho Department of Water Resources, used a suite of isotopic and environmental tracers to gain a better understanding of groundwater ages, recharge sources, and flowpaths in northern Ada County. Thirteen wells were sampled between September and October 2009 for field parameters, major anions and cations, nutrients, oxygen and hydrogen isotopes, tritium, radiocarbon, chlorofluorocarbons, and dissolved gasses. Well depths ranged from 30 to 580 feet below land surface. Wells were grouped together based on their depth and geographic location into the following four categories: shallow aquifer, intermediate/deep aquifer, Willow Creek aquifer, and Dry Creek aquifer. Major cations and anions indicated calcium-bicarbonate and sodium-bicarbonate water types in the study area. Oxygen and hydrogen isotopes carried an oxygen-18 excess signature, possibly indicating recharge from evaporated sources or water-rock interactions in the subsurface. Chlorofluorocarbons detected modern (post-1940s) recharge in every well sampled; tritium data indicated modern water (post-1951) in seven, predominantly shallow wells. Nutrient concentrations tended to be greater in wells signaling recent recharge based on groundwater age dating, thus confirming the presence of recent recharge in these wells. Corrected radiocarbon results generated estimated residence times from modern to 5,100 years before present. Residence time tended to increase with depth, as confirmed by all three age-tracers. The disagreement among residence times indicates that samples were well-mixed and that the sampled aquifers contain a mixture of young and old recharge. Due to a lack of data, no conclusions about sources of recharge could be drawn from this study.

Download or read book Use of Isotopic Data to Evaluate Recharge and Geologic Controls on the Movement of Ground Water in Las Posas Valley Ventura County California written by John A. Izbicki and published by . This book was released on 1997 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Simulation Analysis of the Unconfined Aquifer Raft River Geothermal Area Idaho Utah written by William D. Nichols and published by . This book was released on 1979 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Isotopic Investigation of the Sources of Recharge to the Coachella Valley Aquifer System Riverside County California written by Frank W. diemel and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: For stakeholders in the Coachella Valley, the Coachella Valley Aquifer system is the main source of water, and has been under drawdown conditions since 1936. Presently, Coachella Valley water authorities import up to ~225,000 Af/y of Colorado River water to combat continued over-development. In this investigation, stable and radioisotopes of water and carbon in approximately 80 samples of combined spring, surface waters and well waters from the study area are used to contrast and compare a stable water isotope water-budget versus the water-budget of the USGS 1974 "Analog Model Study of the Ground-Water Basin of the Upper Coachella Valley, California". Stable water isotope data (n = 56) demonstrate springs, surface waters, and wells located in the San Jacinto and San Bernardino mountains plot as a Local Meteoric Water Line defined as Î4D = 8.7Îþ18O + 19.4. Hot and warm springs (n = 6) of the Cahuilla Nation in the Palm Canyon watershed define a regional evaporation trendline written as Î4D = 5.2Îþ18O - 21. Stable water isotopes suggest San Gorgonio and Mission Creek subbasins underflow comprise ~72% of the groundwater recharge to the Indio subbasin. Snowmelt runoff from the Whitewater River and Mission Creek watersheds along with mountain front runoff from the flanking watersheds of the San Jacinto and Santa Rosa mountains are other sources of recharge to the Indio subbasin. There is very little mixing of groundwater from the Desert Hot Springs subbasin with the Indio subbasin groundwater. Nested wells located at the Windy Point recharge facility demonstrate shallow wells have stable water isotope values similar to imported Colorado River water, deep wells having stable water isotope values similar to wells and low elevation springs located in the San Gorgonio subbasin, validating underflow as a major source of recharge. Stable water isotope values in mid-depth Windy Point nested wells demonstrate an ~ 40% to 60% imported Colorado River water versus native Whitewater River surface water mixture. Piper diagram analysis of major-ion concentrations demonstrate mixing of imported Colorado River water and Whitewater River surface water in mid-depth Windy Point wells. Chloride versus Sulfate analysis of three mid-depth Windy Point wells show an ~40% to ~60% mixture of imported Colorado River water and Whitewater River surface water validating the stable water isotope observations. There is little to no underflow contribution from the Whitewater River watershed to the Indio subbasin. The Analog Model overstates the Whitewater River watershed groundwater contribution to the Indio subbasin, and understates the Mission Creek groundwater contribution to the Indio subbasin. Wells located At the Windy Point recharge facility Stable water isotopes datum points suggest the groundwater contribution to the Indio subbasin from the San Gorgonio Pass subbasin is ~48%, and Mission Creek subbasin ~24%. Or, approximately 12864 Af/y, and 6336 Af/y, respectively.Îþ18O and Î4D, C14 and Tritium in sample waters suggest recharge to the Coachella Valley Aquifer system occurs mostly as winter precipitation as snow in the watersheds of the flanking Santa Rosa, San Jacinto and San Bernardino mountains; with limited recharge occurring on the Coachella Valley floor. Taken together, stable water isotopes and radioisotopes of sample waters provide water managers and Engineering Geologist inexpensive tools for tracing groundwater recharge and groundwater movement in a compartmentalized aquifer system.

Download or read book Nutrients Suspended Sediment and Pesticides in Streams and Irrigation Systems in the Central Columbia Plateau in Washington and Idaho 1959 1991 written by Karen E. Greene and published by . This book was released on 1997 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Identification of an Isotopic and Hydrochemical Anomaly in the Discharge Area of the Fox Hills Aquifer South central North Dakota written by Cathleen Anne Carlson and published by . This book was released on 1994 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Determining Sources of Recharge in an Urban and Semiarid Aquifer written by and published by . This book was released on 2019 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The San Diego County Water Authority has been working to diversify its water supplies and there is an interest in the potential utilization of the Mission Valley aquifer as a source. Previously, groundwater in San Diego County has largely been ignored with only a few studies attempting to identify characteristics of the Mission Valley aquifer. In order to properly manage the Mission Valley aquifer, information about sources of groundwater recharge are necessary. This project answers this question by quantifying the flow pathways delivering water into the aquifer. Each potential source of recharge was investigated by determining their unique 18O and 2H isotopic “fingerprints” and comparing them to that of groundwater. These fingerprints were then used as endmembers in End-Member Mixing Analysis (EMMA), which solves a system of equations using the least squares method to produce percentages of each source contributing to recharge. To determine endmembers, samples of baseflow, precipitation, and stormflow from 8 storm events were taken from three different streams that may contribute to aquifer recharge. The samples were then analyzed for their isotopic composition. Results of EMMA indicate that during storm events, streamflow in the main stem of the San Diego River is initially discharged with precipitation, then groundwater return flow is dominant the rest of the storm. Overall stormflow composition of the San Diego River is a mixture pre-event evaporated baseflow and non-evaporated baseflow, characteristic of groundwater. Stormflow composition in two tributaries of the San Diego River was reflective of precipitation, indicating discharge produced during storm events is attributed to rainfall input. EMMA ran on each individual groundwater sample determined that groundwater was recharged through the infiltration of streamflow, with 2/3rds from non-evaporated streamflow occurring during storm events and 1/3rd from evaporated baseflow. Groundwater composition did not vary seasonally, suggesting long residence times.

Download or read book Isotopic Investigation of Recharge to a Regional Groundwater Flow System Great Basin NV written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater recharge processes were investigated in central Nevada by examining the relationships between the stable isotope ([delta]D and[delta][sup 18]O) compositions of snowfall, snowmelt, alpine spring waters, and regional groundwaters. Snowmelt infiltration is inferred to he the dominant source of groundwater recharge in this region. Bulk snow cores collected throughout central Nevada near the time of maximum accumulation have[delta]D and[delta][sup 18]O pairs that plot subparallel to the global meteoric water line (GMWL), but have negative d-values, implying kinetic isotope enrichments. Heavy isotope enrichments occur at the base of snowpacks due to fractionation during snow metamorphism, sometimes resulting in remarkably systematic isotopic variations. Ice crystals in the soil immediately beneath the snowpack can be strongly depleted in heavy isotopes relative to the overlying snow, implying fractionation or exchange with the snowpack. Late season ablation processes tend to homogenize isotopic variations between snowpack layers, and cause the bulk isotopic composition of the snowpack to become enriched in[sup 18]O by 2-3[per-thousand] relative to the composition during peak accumulation. The dynamic evolution of the snowpack and snowmelt isotopic compositions over time makes it difficult to directly ascertain groundwater recharge compositions without careful mass balance measurements. Preliminary evidence suggests that small local springs may be reasonable indicators of the integrated isotopic value of the snowmelt recharge in a particular area. Springs and snowmelt runoff samples collected throughout central Nevada during the peak runoff plot along a least squares regression line with the equation[delta]D= 7.3[delta][sup 18]O - 7, which is similar to the line obtained for 28 metamorphosed snow cores collected during peak accumulation ([delta]D= 7.5[delta][sup 18]O - 3). These results suggest that kinetic fractionation processes during snow metamorphism and ablation may largely account for the low d-values that are widely observed in groundwaters from both local and regional flow systems in Nevada.

Download or read book Isotopic Characterization of Groundwater Recharge and Flow in an Upland Bedrock Aquifer Vermont written by Michael David Abbott and published by . This book was released on 1997 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Using Groundwater Age and Other Isotopic Signatures to Delineate Groundwater Flow and Stratification written by J. E. Moran and published by . This book was released on 2005 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Isotopic tracers, such as stable isotopes of the water molecule and tritium, have been used in investigations of groundwater flow and transport and recharge water source for several decades. While these data can place hard constraints on groundwater flow rates, the degree of vertical flow between aquifers and across aquitards, and recharge source area(s), they are rarely used, even for validation, in conceptual or numerical models of groundwater flow. The Groundwater Ambient Monitoring and Assessment Program, sponsored by the California State Water Resources Control Board, and carried out in collaboration with the U.S. Geological Survey, has provided the means to gather an unprecedented number of tritium-helium groundwater ages in the basins of California. As the examples below illustrate, a collection of groundwater ages in a basin allows delineation of recharge areas (youngest ages), bulk flow rates and flowpaths, as well as a means of assessing susceptibility to anthropogenic contaminants.

Download or read book South Fork Palouse River Watershed Assessment and TMDLs written by and published by . This book was released on 2007 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Interpretation of Long term Grande Ronde Aquifer Testing in the Palouse Basin of Idaho and Washington written by Kathryn Moran and published by . This book was released on 2011 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: