Data on annual total nitrogen loads and watershed characteristics used to develop a method to estimate the total nitrogen loads in small streams

This USGS Data Release represents the data used to develop multiple linear regression models for estimating the loads of total nitrogen in small streams. Recursive partitioning and random forest regression were used to assess 85 geospatial, environmental, and watershed variables across 636 small (less than 585 square kilometers) watersheds to determine which variables are fundamentally important to the estimation of annual loads of total nitrogen. These data support the following publication: Kronholm, S.C., Capel, P.D., and Terziotti, Silvia, 2016, Statistically extracted fundamental watershed variables for estimating the loads of total nitrogen in small streams: Environmental Modeling and Assessment, 10 p., http://dx.doi.org/10.1007/s10666-016-9525-3.

Categories: Data; Types: Citation; Tags: USGS Science Data Catalog (SDC), United states, Water Quality, fundamental variables, national model, All tags... nitrogen, random forest regression, recursive partitioning, Fewer tags

Hydrograph-separation results for 225 streams in the Chesapeake Bay watershed derived by using PART, HYSEP (Fixed, Local minimum, Slide), BFI, and a Recursive Digital Filter with streamflow data ranging from 1913 through 2016

This U.S. Geological Survey (USGS) data release contains daily-mean streamflow and estimated-daily base flow for 225 streamgages in the Chesapeake Bay watershed ranging from 1913 to 2016 (beginning and end dates may vary). There is a table containing hydrograph-separation results by six methods for 225 sites (Hydrograph_separation_results_for_225_streams_in_the_Chesapeake_Bay_watershed) and a summary table with hydrograph-separation results for each site and method (Hydrograph_separation_summary_for_225_streams_in_the_Chesapeake_Bay_watershed). Quantitative estimates of base flow are necessary to address questions of the vulnerability and response of aquatic ecosystems to natural and human-induced change in environmental...

Categories: Data; Tags: Base flow, Chesapeake Bay watershed, Hydrogeology, Hydrograph separation, USGS Science Data Catalog (SDC), All tags... groundwater, Fewer tags

Datasets to reproduce the exploratory Bayesian network developed in USGS SIR 2018-5053 for estimating water-quality parameters at streamgage 03374100 White River at Hazleton, Indiana, 1973-2016

This U.S. Geological Survey (USGS) data release contains the data used in the USGS Scientific Investigations Report 2018-5053 entitled "An exploratory Bayesian network for estimating the magnitudes and uncertainties of selected water-quality parameters at streamgage 03374100 White River at Hazleton, Indiana, from partially observed data." The four datasets, which contain only ASCII characters in a column-oriented format, are: (1) sel_qw_parm_full_time_series.csv: A comma-delimited file containing an irregular time series of 713 rows of discrete water-quality measurements that start on February 21, 1973 and end on September 14, 2016. (2) baye_network_initialize.cas: This tab-delimited file can be used to initialize...

Categories: Data; Tags: Bayesian, Bayesian network, Hazleton, Hydrogeology, Indiana, All tags... USGS Science Data Catalog (SDC), Water Quality, Water Resources, White River, conditional probability, d-separation (directional separation), directed acyclic graph (DAG), stream-gage measurement, streamflow, surface water (non-marine), surface water quality, water quality, Fewer tags

Estimates of atmospheric inorganic nitrogen deposition to the Chesapeake Bay watershed, 1950-2050

Reactive nitrogen is transported from the atmosphere to the landscape as wet and dry deposition that contributes to annual nitrogen loads to the Chesapeake Bay. Estimates of atmospheric inorganic nitrogen deposition to the Chesapeake Bay watershed during 1950 to 2050 are presented, and are based on field measurements, model simulations, statistical relations, and surrogate constituents used for estimates. Wet atmospheric nitrogen deposition has generally been quantified from weekly precipitation sample collections, whereas dry atmospheric nitrogen deposition has been simulated by a model at an hourly time step.

Tags: Chesapeake, Chesapeake Bay watershed, Delaware, District of Columbia, Environmental Health, All tags... Geochemistry, Hydrology, Land Use Change, Lower Chesapeake Bay, Maryland, New York, Pennsylvania, USGS Science Data Catalog (SDC), Upper Chesapeake Bay, Virginia, Water Quality, West Virginia, ammonia, ammonium, atmospheric and climatic processes, atmospheric deposition (chemical & particulate), atmospheric properties, direct atmospheric deposition, estuary, inorganic, nitrate, nitric acid, nitric oxide, nitrogen, oxides, precipitation (atmospheric), reduced, water quality, watershed, watershed management, Fewer tags

Datasets and scripts used for estimating streamflow and base flow within the nontidal Chesapeake Bay riverine system, water years 2006-15

This U.S. Geological Survey (USGS) data release contains estimated daily streamflow and base flow for HUC12 in the nontidal areas of the Chesapeake Bay watershed, monthly average streamflow and base flow, flow statistics, MATLAB scripts, and a document that describes how to create similar datasets in other watersheds. Daily streamflow was estimated for all the nontidal parts of the Chesapeake Bay watershed with the program "Unit Flows in Networks of Channels" (UFINCH; Holtschlag, 2016), together with the observations of measured streamflow at gages at the downstream ends of major rivers. The estimated streamflow was aggregated at the HUC12 level and reformatted as an Optimal Hydrograph Separation (OHS) input file...

Categories: Data; Tags: Chesapeake Bay watershed, Delaware, Maryland, Pennsylvania, USGS Science Data Catalog (SDC), All tags... Virginia, Washington, DC, Water Quality, West Virginia, base flow, baseflow, datasets, geospatial datasets, groundwater, hydrograph separation, stream-gage measurement, streamflow, surface water (non-marine), Fewer tags

Source and model output layers used for the prediction and display of the probability of elevated concentrations of redox-sensitive constituents in groundwater in the Fox-Wolf-Peshtigo watershed in Wisconsin and Michigan

This USGS data release contains 1-kilometer resolution source-layer rasters used to predict redox conditions and contaminant concentrations in groundwater in the Fox-Wolf-Peshtigo watershed in Wisconsin and Michigan using random forest classification. The model output layers are 1-kilometer resolution rasters of the predicted probability of elevated concentrations of nitrate, iron, and arsenic. This data release supports the following publication: Tesoriero, A.J., Gronberg, J.M., Juckem, P.F., Miller, M.P., and Austin, B.P., 2017, Predicting redox-sensitive contaminant concentrations in groundwater using random forest classification: Water Resources Research, v. 53, https://doi.org/10.1002/2016WR020197.

Tags: Fox-Wolf-Peshtigo watershed, Michigan, National Water Quality Program, USGS Science Data Catalog (SDC), Water Resources, All tags... Wisconsin, arsenic, drinking water quality, groundwater, groundwater quality, iron, nitrate, random forest classification, redox, Fewer tags

Nitrogen sources to and export from the Chesapeake Bay watershed, 1950 to 2050

This U.S. Geological Survey data release contains datasets that combine past data with future projections of nitrogen sources and nitrogen export to the Chesapeake Bay watershed for the years 1950-2050. To help understand the effect of human and environmental changes over this time period, data for nitrogen sources from wastewater, agricultural fertilizer and manure, and atmospheric deposition are combined with datasets of population and land use. These datasets were used in conjunction with a previously calibrated SPAtially Referenced Regression On Watershed attributes (SPARROW) modeling tool to estimate the mean annual loads of total nitrogen to the Chesapeake Bay and nontidal stream reaches in the watershed at...

Tags: Chesapeake, Chesapeake Bay watershed, Delaware, District of Columbia, Environmental Health, All tags... Geochemistry, Hydrology, Land Use Change, Lower Chesapeake Bay, Maryland, New York, Pennsylvania, TMDL, USGS Science Data Catalog (SDC), Upper Chesapeake Bay, Virginia, Water Quality, West Virginia, agriculture, baseflow, climate change, effects of climate change, estuary, eutrophication, evaporation, fertilizer, groundwater, groundwater and surface-water interaction, groundwater quality, land cover change, land use change, manure, mathematical modeling, nitrate, nitrogen, point sources, runoff, stormwater, streamflow, surface water, surface water (non-marine), surface water quality, transpiration, urban areas, wastewater discharge, water quality, watershed, watershed management, Fewer tags

Code, data, executables, and other information used to run Unit Flows in Networks of Channels (UFINCH) - A method for simulating unit and daily flows in networks of channels described by NHDPlus using continuous flow data at U.S. Geological Survey streamgages

This U.S. Geological Survey (USGS) data release contains the code, data, executables, and other information necessary to run the application Unit Flows in Networks of Channels (UFINCH). The UFINCH application is a computer code that utilizes the geospatial stream connectivity and catchment geometry described in National Hydrography Dataset Plus value added attributes (NHDPlus Version 2) to simulate unit (15-minute) flows in networks of channels, generally by use of daily flows at the most downstream stream segment in a basin at which a USGS streamgage is located. Preliminary testing indicates that UFINCH may be most applicable for simulating unregulated, non-estuarial, flows in basins as large as 3,000 square miles...

Types: Citation; Tags: Hawaii, NHDPlus geospatial data describing stream networks, NWIS daily flows, National Water Quality Program, Puerto Rico, All tags... USGS Science Data Catalog (SDC), United States, Virgin Islands of the United States, geospatial datasets, stream-gage measurement, streamflow, surface water (non-marine), Fewer tags

Patterns of Diel Variation in Nitrate Concentrations in the Potomac River

This data set includes nitrate concentration, water temperature, and discharge collected every 15 minutes during Dec. 2011 - Nov. 2013 from the USGS gage at the Potomac River near Wash, DC, Little Falls Pump Sta (01646500). Additional data includes day length from the US Naval Observatory, and photosynthetically active radiation from USDA research station in Beltsville, MD. Data on channel width and velocity based on manual discharge measurements made at the USGS gage at the Potomac River at Point of Rocks, MD (01638500) are included and were applied to calculate diel nitrate loss rates. Several calculations derived from these data are included in the data set. These data support the following publication: Burns,...

Categories: Data; Types: Citation; Tags: Chesapeake Bay, Potomac River, USGS Science Data Catalog (SDC), Water Quality, diel variation, All tags... in-stream processes, nitrate, nitrogen, river, Fewer tags

Real and synthetic data used to test the Two-tracer Ratio-based Mixing Model (TRaMM)

This USGS Data Release represents the synthetic and real data from hydrologically diverse streams used to test the performance and limitations of the Two-tracer Ratio-based Mixing Model (TRaMM) which uses high-frequency measures of two tracers (A and B) and streamflow to separate total streamflow into water from slowflow and fastflow sources. The ratio between the concentrations of the two tracers is used to create a time-variable estimate of the concentration of each tracer in the fastflow end-member. Synthetic data from a groundwater dominated stream and an overland flow dominated stream were used to test the sensitivity of the model to various conditions and tracer concentrations. The sensitivity analysis provides...

Categories: Data; Tags: Baseflow separation, Chesterville Branch, MD, Continuous data, End-member mixing analysis, Groundwater transport, All tags... High-frequency water quality data, Hydrograph separation, Indian Creek, KS, Modeling, Overland flow, Streamflow, Time-variable end-member concentration, USGS Science Data Catalog (SDC), Water Resources, Water budgets, Fewer tags

Datasets and metadata for estimates of nitrate loads and yields from groundwater to streams in the Chesapeake Bay watershed based on land use and geology

This USGS data release contains datasets, metadata, and figures associated with estimating nitrate loads and yields from groundwater to streams in the Chesapeake Bay watershed based on land use and geology. There are three shapefiles with associated metadata and figures representing the shapefiles: • Catchments_GWcontribN.shp: NHDPlus catchment estimates of groundwater contribution of nitrate to streams in the Chesapeake Bay watershed • HUC12_GWcontribN.shp: HUC 12 estimates of groundwater contribution of nitrate to streams in the Chesapeake Bay watershed • Sites_GWcontribN.shp: Sites with baseflow measurements for nitrate plus nitrite within the Chesapeake Bay watershed These data support the following publication:...

Types: Citation; Tags: Chesapeake Bay, Delaware, District of Columbia, Maryland, National Water Quality Program, All tags... New York, Pennsylvania, USGS Science Data Catalog (SDC), Virginia, West Virginia, baseflow, groundwater, nitrate, water quality, Fewer tags