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Nitrogen Loads, Yields, and Associated Field Data Collected During Baseflow Conditions and Site Attributes for Small Basins Draining to Long Island Sound During the spring and summer of 2022, the U.S. Geological Survey collected water-quality samples for nutrient analysis at 45 stations across the state of Connecticut and adjacent areas of New York and Rhode Island to better understand the groundwater discharge component of nitrogen loading to the Long Island Sound. The targeted stations were located in small drainage basins (less than 50 square kilometers) in the southern portion of the Long Island Sound watershed. Sites were selected randomly from groups based on expected drivers or controls on baseflow nitrogen loads. Factors used in the grouping included four metrics calculated for the upstream watershed: percent impervious cover, septic system density, percent... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Connecticut, Connecticut Coastal, Hydrology, Long Island Sound, New York, All tags... Rhode Island, USGS Science Data Catalog (SDC), Water Quality, Water Resources, groundwater and surface-water interaction, inlandWaters, nitrogen, nutrient content (water), stream discharge, Fewer tags Percentage of Hypothetical Well Pumpage Causing Depletions to Simulated Base Flow, Evapotranspiration, and Groundwater Storage in the Elkhorn and Loup River Basins, 2011 through 2060 This data release includes a polygon shapefile of grid cells attributed with values representing the simulated base-flow, evapotranspiration, and groundwater-storage depletions as a percentage of hypothetical well pumpage for the 2011-2060 time period. Depletions were simulated by the Phase-Three Elkhorn-Loup Model (ELM), constructed using MODFLOW-NWT (Niswonger and others, 2011). Each polygon represents one model grid cell, with pumping specified from either layer one or layer two of the model. All values are estimates and approximations. The phase three ELM simulated the High Plains aquifer in north-central Nebraska from predevelopment (pre-1895) through 2060 (Flynn and Stanton, 2018). The simulation was calibrated... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Shapefile; Tags: Calamus River, Dismal River, Elkhorn River, Loup River, Middle Loup RIver, All tags... Nebraska, North Loup River, Sand Hills, South Loup River, evapotranspiration, geohydrology, geoscientificInformation, groundwater, groundwater availability, groundwater irrigation, hydrologic models, inlandWaters, streamflow depletion, Fewer tags Data release of Bathymetric Map, Surface Area, and Capacity of Grand Lake O' the Cherokees, Northeastern Oklahoma, 2019 The U.S. Geological Survey in cooperation with the Grand River Dam Authority completed a high-resolution multibeam bathymetric survey to compute a new capacity and surface-area table. The capacity and surface-area tables describe the relation between the elevation of the water surface and the volume of water that can be impounded at each given water-surface elevation. The capacity and surface area of Grand Lake O’ the Cherokees were computed from a Triangular Irregular Network (TIN) surface created in Global Mapper Version 21.0.1. The TIN surface was created from three datasets: (1) a multibeam bathymetric survey of Grand Lake O’ the Cherokees in 2019 (Hunter and others 2020), (2) a 2017 USGS bathymetric survey... Categories: Data; Types: Downloadable, GeoTIFF, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Raster, Shapefile; Tags: Bathymetry, Bathymetry and Elevation, Bathymetry and Elevation, Grand Lake O' the Cherokees, Oklahoma, All tags... U.S. Geological Survey, USGS, USGS Science Data Catalog (SDC), Water Resources, bathymetry, climatologyMeteorologyAtmosphere, inlandWaters, multibeam echo sounder, utilitiesCommunication, Fewer tags Bathymetric survey and stage-storage assessment of Quail Lake, Calif., collected in 2022 This bathymetric dataset provides an update to the stage-storage relation for Quail Lake (reservoir) located in the El Dorado National Forest, Calif. Bathymetric data was collected using a multibeam echo sounder to provide near-complete coverage and was merged with USGS 3DEP lidar to compute a DEM of the lake and near shore. The DEM was used to computed storage and surface area for a range of stage elevations. Results show that the spillway elevation was 6799.3 feet (NAVD88) and the crest elevation was 6802.5 feet (NAVD88). At the spillway elevation the storage was 141.74 ac-ft with a surface area of 14.20 ac. At the crest elevation the storage was 190.05 ac-ft with a surface area of 15.89 ac. Categories: Data; Types: Downloadable, GeoTIFF, Map Service, Raster; Tags: Bathymetric, California, Eldorado National Forest, Geomorphology, Hydrology, All tags... Quail Lake, Reservoir Sedimentation, Sedimentology, Stage-storage relation, USGS Science Data Catalog (SDC), elevation, Fewer tags NGWOS Ground Based Discrete Snowpack Measurements Ground-based discrete snowpack measurements were collected during winter field campaigns starting in 2020. These data were collected as part of the U.S. Geological Survey (USGS) Next Generation Water Observing System (NGWOS) Upper Colorado River Basin project focusing on the relation between snow dynamics and water resources. This data release consists of three child items. Each child item contains snow depth, snow density, snow temperature, or snow water equivalent values measured discretely in the field. The data are provided in comma separated value (CSV) files. Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Colorado, Colorado River, Hydrology, Integrated Water Science, Rocky Mountains, All tags... USGS Science Data Catalog (SDC), Water Resources, snow, snow density, snow depth, snow pit, snow temperature, snow water equivalent, snowpack, Fewer tags Model subareas and moisture zones used in a sensitivity analysis of a water-budget model completed in 2022 for the island of Oahu, Hawaii A sensitivity analysis of groundwater-recharge estimates from a water-budget model was completed for the islands of Oahu and Maui, Hawaii (Johnson and others, 2023). Results of the sensitivity analysis were used to quantify the relative importance of selected model parameters to recharge estimates for three moisture zones (dry, mesic, and wet) on Oahu and Maui. This shapefile contains the boundaries of the moisture zones and boundaries of the model subareas that were used in the model simulations for Oahu. The shapefile attribute information includes the names of the land-cover types assigned to model subareas and the mean annual recharge values determined for the model subareas for the baseline scenario of the... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Shapefile; Tags: Hawaii, Oahu, Pacific Islands, biota, boundaries, All tags... climatologyMeteorologyAtmosphere, environment, geoscientificInformation, groundwater, inlandWaters, land use and land cover, water budget, water cycle, Fewer tags Rate of shoreline change statistics for New York State coastal wetlands This data set contains shoreline rate of change statistics for New York State coastal wetlands. Analysis was performed using the Digital Shoreline Analysis System (DSAS), created by U.S. Geological Survey, version 5.0, an extension for ArcMap. A reference baseline was used as the originating point for orthogonal transects cast by the DSAS software. The transects intersect each polyline vector shoreline establishing intersection measurement points, which were then used to calculate the rates of change. End-point rates, calculated by dividing the distance of shoreline movement by the time elapsed between the oldest and the most recent shoreline, were generated for wetlands where fewer than three historic shorelines... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Digital Shoreline Analysis System, End-Point Rate, Geography, Geomorphology, Great South Bay, All tags... Hudson River, Jamaica Bay, Linear Regression Rate, New York, New York Bay, New York State, Peconic Bay, Shoreline Change Rate, U.S. Geological Survey, USGS Science Data Catalog (SDC), United States, Water Resources, Woods Hole Coastal and Marine Science Center, coastal processes, erosion, estuary, shoreline accretion, wetland, wetland ecosystems, Fewer tags Central Valley Hydrologic Model version 2 (CVHM2): Small Watershed Climate Data (Recharge, Runoff) This digital dataset consists of monthly climate data from the Basin Characterization Model v8 (BCMv8) for the updated Central Valley Hydrologic Model (CVHM2) for water years 1922 to 2019. The BCMv8 data are available in a separate data release titled "The Basin Characterization Model - A regional water balance software package (BCMv8) data release and model archive for hydrologic California, water years 1896-2020". The data were modified by: (1) extracting the data from the data source for the relevant model domain and times, and (2) rescaling the 270-meter BCMv8 grid to the small watersheds that contribute boundary flow to the CVHM2 model for the hydrologic variables recharge and runoff. The three data pieces... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: California, Central Valley, Climate, Hydrology, Potential Evapotranspiration, All tags... Precipitation, United States, Water Budget, climatologyMeteorologyAtmosphere, environment, farming, geoscientificInformation, Fewer tags Passive seismic depth to bedrock data collected along streams of the Farmington River watershed, CT, USA Using the horizontal-to-vertical spectral-ratio (HVSR) method, we infer regolith thickness (i.e., depth to bedrock) throughout the Farmington River Watershed, CT, USA. Between Nov. 2019 and Nov. 2020, MOHO Tromino Model TEP-3C (MOHO, S.R.L.) three-component seismometers collected passive seismic recordings along the Farmington River and the upstream West Branch of Salmon Brook. From these recordings, we derived resonance frequencies using the GRILLA software (MOHO, S.R.L.), and then inferred potential regolith thicknesses based on likely shear wave velocities, Vs, intrinsic to the underlying sediment. Three potential shear wave velocities (Vs = 300m/s, 337m/s, 362 m/s) were considered for Farmington River watershed... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Connecticut, Farmington River, Hydrology, USGS Science Data Catalog (SDC), groundwater, All tags... groundwater and surface-water interaction, health, hydrogeology, hydrology, imageryBaseMapsEarthCover, regolith thickness, surface water (non-marine), Fewer tags Russian River Integrated Hydrologic Model (RRIHM): Climate Data for 1990-2015 The Russian River Watershed (RRW) covers about 1,300 square miles (without Santa Rosa Plain) of urban, agricultural, and forested lands in northern Sonoma County and southern Mendocino County, California. Communities in the RRW depend on a combination of Russian River water and groundwater to meet their water-supply demands. Water is used primarily for agricultural irrigation, municipal and private wells supply, and commercial uses - such as for wineries and recreation. Annual rainfall in the RRW is highly variable, making it prone to droughts and flooding from atmospheric river events. In order to better understand surface-water and groundwater issues, the USGS is creating a Coupled Ground-Water and Surface-Water... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: California, Hydrology, Russian River, USGS Science Data Catalog (SDC), United States, All tags... Water Resources, climate, climatologyMeteorologyAtmosphere, evapotranspiration, precipitation, solar radiation, temperature, Fewer tags Estimated crop irrigation water use withdrawals in Willcox Groundwater Basin, Arizona for 2022 Observations of irrigated agricultural land within the Willcox Groundwater Basin in Arizona. Digitized field boundaries were used to locate crops for in situ verification twice in 2022; crop verification occurred first on May 17th and again on August 26th. Field boundaries were digitized from U.S. Department of Agriculture, National Agricultural Imagery Program County Mosaic 2021 imagery for Arizona and supplemented with Landsat and Sentinel2 imagery collections accessed via the Sentinel Hub, Sentinel Playground (https://apps.sentinel-hub.com/sentinel-playground). Satellite images were also used to identify the length of the growing season and crop condition. Water withdrawals were calculated using the modified... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Arizona, Cochise, Graham, Land Use Change, USGS Science Data Catalog (SDC), All tags... Water Resources, Willcox Groundwater Basin, agricultural sites, groundwater, irrigation, water use, Fewer tags Hydrogeologic Aquifer Test dataset, Lower Mississippi-Gulf Water Science Center, December 2021 Since the 1940's, commercial, academic and government hydrologists have used aquifer tests to estimate the hydrogeologic properties of an aquifer near test wells. Results from these tests are recorded in various files, databases, reports, and scientific publications. The U.S. Geological Survey (USGS), Lower Mississippi-Gulf Water Science Center (LMG) is aggregating all aquifer test results from Alabama, Arkansas, Louisiana, Mississippi, and Tennessee into a single dataset that is publicly available in a machine-readable format. The LMG-Hydrogeologic Aquifer Test Dataset – December 2021 contains information and results from 690 hydrogeologic aquifer tests. Additionally, this dataset contains 7 attribute tables... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Alabama, Alabama (AL), Aquifer, Aquifer, Aquifer Test, All tags... Aquifer Test, Arkansas, Arkansas, Conductivity, Conductivity, Groundwater, Groundwater, Hydrogeology, Hydrogeology, Louisiana, Louisiana, Lower Mississippi Gulf Water Science Center, Mississippi, Mississippi, Mississippi Alluvial Plain (MAP) Project, Mississippi Alluvial Plain (MAP) Project, Permeability, Permeability, Specific Capacity, Specific Capacity, Storage Coefficient, Storage Coefficient, Tennessee, Tennessee (TN), Transmissivity, Transmissivity, Fewer tags Hydraulic Conductivity and Transmissivity Estimates from Slug Tests in Wells Within the Mississippi Alluvial Plain, Arkansas and Mississippi, 2020 During the spring and summer of 2020, the U.S. Geological Survey, Lower Mississippi – Gulf Water Science Center, conducted single well slug tests on selected wells within the Mississippi Alluvial Plain in Arkansas and Mississippi to estimate hydraulic conductivity (K) and transmissivity (T) values for the aquifers in which the wells are screened. A total of 324 tests were conducted on 48 wells. The computer software AQTESOLV version 4.50.002 (HydroSOLVE, Inc., 2007) was used to interpret the slug test data to estimate K and T values. Mean estimates of K for the 44 wells screened in the Mississippi River Valley alluvial aquifer ranged from 3 to 401 feet per day (ft/day) and mean estimates of T ranged from 285 to... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: 500-Foot Sand Memphis Sand, 500-Foot Sand Memphis Sand, 500-foot Sand, Ar, Arkansas, All tags... Common geographic areas, Conductivity, Groundwataer, Groundwataer, Groundwater, Hydraulic Conductivity, Hydraulic Conductivity, Instantaneous change in head test, Instantaneous change in head test, Memphis Sand, Mississippi, Mississippi Alluvial plain, Mississippi River Valley alluvial aquifer, Mississippi River Valley alluvial aquifer, Mississippi embayment aquifer system, Mississippi embayment aquifer system, Slug Test, Slug Test, Sparta Sand, Sparta Sand, Transmissivity, Transmissivity, USGS Science Data Catalog (SDC), middle Claborne aquifer, middle Claiborne aquifer, middle Claiborne aquifer, Fewer tags Paleomagnetic inclination data collected from Coreholes EREF-GW-1, STF-PIE-AQ-02, TAN 2336, USGS 138, USGS 139, USGS 142, USGS 143, USGS 144, USGS 145, USGS 147, and USGS 148A, located at and near the Idaho National Laboratory, Idaho The U.S. Geological Survey, in cooperation with the U.S. Department of Energy, conducted a study on the magnetic record contained in subsurface basalts within coreholes at the Idaho National Laboratory. Standard 1 inch paleomagnetism core samples were collected from 11 coreholes. The samples were characterized for polarity and average paleomagnetic inclinations over the entire length of the drill core. However, paleomagnetic declination data were not obtained due to the original azimuth of the drill cores not being preserved during drilling. The samples were extracted from individual lava flows based on identification of flow tops and bottoms in the drill core. These samples were then transported to the USGS Paleomagnetic... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: 432851113001401, 432906113025003, 433127112533201, 433358113042701, 433535112390801, All tags... 433736112341301, 433823112460401, 433837113010901, 434615112553501, 435053112423203, Butte County, EREF-GW-1, Eastern Snake River Plain, INL Lithologic Core Storage Library, INLPO, Idaho, Idaho National Laboratory, STF-PIE-AQ-02, TAN 2336, USGS 138, USGS 139, USGS 142, USGS 143, USGS 144, USGS 145, USGS 147, USGS 148A, USGS Science Data Catalog (SDC), Volcanology, environment, geology, paleomagnetic, paleomagnetic inclination, Fewer tags Little Rock Reservoir, California, 2022 bathymetric survey and stage-storage computations This bathymetric dataset provides an update to the stage-storage relation for Little Rock Reservoir located in the Angeles National Forest, California. Bathymetric data was collected using a multibeam echo sounder to provide near-complete coverage and was merged with U.S. Geological Survey 3D Elevation Project lidar to compute a digital elevation model (DEM) of the reservoir and surrounding watershed. The DEM was used to computed storage and surface area for a range of stage elevations. Results show that the mean cross-spillway elevation was 3273 feet above the North American Vertical Datum 1988 (NAVD88) and the mean dam crest elevation was 3277 feet (NAVD88). At the spillway elevation the storage was 3335.8 acre-feet... Categories: Data; Types: Downloadable, GeoTIFF, Map Service, Raster; Tags: Angeles National Forest, California, Hydrology, Little Rock Reservoir, Sedimentology, All tags... USGS Science Data Catalog (SDC), Water Quality, bathymetric survey, elevation, inlandWaters, sedimentation, stage-storage, Fewer tags Data Release: Water Quality and Estimated Changes in the Plum Creek Watershed 2010-2020 This section of the data release supports the data used in models for the associated publication. The U.S. Geological Survey and the University of Wisconsin – Green Bay collected hydrologic and water-quality data to assess the effectiveness of agricultural conservation management practice (CMP) implementation at Mainstem Plum Creek (USGS site ID: 04084911) and West Plum Creek (USGS site ID: 04084927) in northeastern Wisconsin. Monitoring data from 2010–2020 at Mainstem Plum and 2013–2020 at West Plum were used to detect changes in hydrologic and water-quality responses during runoff events. Runoff events were defined by hydrographers and used to compute event loads and event flow-weighted mean concentrations of... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Lake Michigan, Wisconsin, agriculture, erosion, nutrient content (water), All tags... precipitation (atmospheric), stream discharge, surface water quality, suspended material (water), Fewer tags Little Dry Creek and Cottonwood Creek Sediment Transport Data, 2012-2018, San Joaquin Watershed in the California Central Valley Two tributary watersheds¬ Cottonwood Creek and Little Dry Creek¬ to the greater San Joaquin watershed, in California’s Central Valley were assessed for sediment and flow dynamics, between water years (Oct. 1 to Sept. 30) 2011 and 2019. The two systems deliver suspended sediment to the San Joaquin River below Friant Dam, California. Because these two creeks are directly down river of Friant Dam, they become the most upstream source of sediment to the San Joaquin River below Friant Dam. Thus, is it important to assess their contribution to the San Joaquin system. Flow from each creek watershed, along with the San Joaquin River, was compared to continuously measured water surface elevations to quantify flow direction... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Cottonwood Creek, Cottonwood Creek, Ecology, Geomorphology, Hydrology, All tags... Little Dry Creek, Little Dry Creek, San Joaquin River, San Joaquin River, Sediment transport, Sediment transport, Sedimentology, USGS Science Data Catalog (SDC), Water Quality, Water Resources, Wildlife Biology, inlandWaters, river systems, Fewer tags Mapping karst groundwater flow paths and delineating recharge areas for springs in the Little Sequatchie and Pryor Cove watersheds, Tennessee The Little Sequatchie River and Pryor Cove Creek watersheds are located in southern Tennessee and drain the eastern escarpment of the Cumberland Plateau to the Sequatchie River. The Little Sequatchie River has the largest drainage area of any Sequatchie River tributary, with over 130 square miles in the topographic confines of the watershed. The hydrology of both watersheds has been largely altered by karst processes which have caused the majority of the streams to sink into the sub-surface, typically at the contact between the Mississippian Pennington Formation and the underlying Mississippian Bangor Limestone. A collaborative project between the U.S. Geological Survey and the U.S. Fish and Wildlife Service began... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Bryant Cove, Coppinger Cove, Cumberland Plateau, Grundy County, Hydrology, All tags... Little Sequatchie River, Marion County, Pryor Cove, Pryor Cove Creek, Sequatchie, Sequatchie Valley, Tennessee, USGS Science Data Catalog (SDC), Water Resources, biota, caves, caves, caves, dye tracing, dye tracing, groundwater, groundwater and surface-water interaction, groundwater flow, groundwater tracing, hydrogeology, karst, karst, karst areas, karst hydrology, karst topography, water cycle, Fewer tags Adirondack New York soil chemistry data, 1992-2017 (ver. 1.1, December 2020) This dataset contains measurements of chemical concentrations of soil samples representing 28 headwater drainage basins completely within the Adirondack Park of New York State (ADK Park), one basin partially in the ADK Park, and one watershed 2 kilometers from the ADK Park boundary. Seven of these watersheds have been sampled 2 or 3 times over periods of 12 to 22 years. Soil samples were collected from pit faces exposed by shoveling. Total mass of organic matter, carbon and nitrogen in the forest floor are also presented for 16 headwater drainage basins in the ADK Park. Forest floor mass data were determined from samples collected with soil corers. The presented data are organized by six projects: the Adirondack... Categories: Data, Data Release - Revised; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Adirondack Park, Adirondack Park, New York, Ambient Monitoring, B horizon, B horizon, All tags... Biogeochemical and Hydrologic Assessment, Ecological Assessment of Human and Natural Impacts, Ecosystem Health, New York, New York, Oa horizon, Oa horizon, Oe horizon, Oe horizon, Soils, USGS Science Data Catalog (SDC), acidic deposition recovery, acidic deposition recovery, forest floor, forest floor, forest soils, forest soils, loss on ignition, loss on ignition, mineral soil, mineral soil, soil acidity, soil acidity, soil aluminum, soil aluminum, soil calcium, soil calcium, soil carbon, soil carbon, soil change, soil change, soil chemistry, soil chemistry, soil horizons, soil horizons, soil magnesium, soil magnesium, soil nitrogen, soil nitrogen, soil organic matter, soil organic matter, soil pH, soil pH, soil profile description, soil profile description, soil science, soil science, soil sodium, soil sodium, soils data, soils data, Fewer tags Tennessee Karst Groundwater Dye Tracing Water Year 2022 Karst hydrologic systems are important resources in the state of Tennessee both as drinking water resources and as centers for possible biological diversity. These systems are susceptible to contamination due to the inherent connectivity between surface water and groundwater in karst landscapes. A partnership between the U.S. Geological Survey (USGS) and Tennessee Department of Conservation (TDEC) was formed to investigate karst spring systems across the state utilizing fluorescent groundwater tracing, particularly in areas where these resources may be used as drinking water sources. In fall 2021, USGS and TDEC staff identified possible vulnerabilities or complexities that may exist within karst spring systems based... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Boiling Fork Creek, COWAN TENNESSEE KARST SPRING CAVE DYE TRACING TDEC USGS, Cannon County, TN, Cowan, TN, Cumberland Plateau, All tags... Dickson County, TN, East Fork Stones River, Eastern Highland Rim, Franklin County, TN, Jasper, TN, Marion County, TN, Sequatchie River, Sequatchie Valley, TENNESSEE DYE TRACING SPRINGS CAVES KARST GEOLOGY HYDROLOGY, TENNESSEE KARST SPRING CAVE DYE TRACING TDEC USGS, Tennesee Dye Tracing Karst Spring Cave Hydrology, Tennessee, Tennessee Springs Hydrology Geology Dye Tracing, USGS Science Data Catalog (SDC), Vanleer, TN, Western Highland Rim, Woodbury, TN, biota, caves, caves, dye tracing, dye tracing, groundwater, groundwater and surface-water interaction, groundwater tracing, hydrogeology, karst, karst, karst, karst hydrology, karst hydrology, karst tn dye tracing water year 22, karst topography, Fewer tags 1 2 3 4 5 »