Data

This metadata record describes the annual average number of occurrences of dry and wet events during the 30-year period 1981-2010 for the conterminous United States. A wet event is defined as a period when the number of consecutive days with precipitation equals or exceeds 1 millimeter. A dry event is defined as a period when the number of consecutive days with precipitation equals 0 millimeters.

This metadata record documents a rudimentary estimate of nitrogen from septic for the conterminous United States for 2010, derived from block-group 1990 and 2010 Decennial Census of Population and Housing data. Specifically, the data were computed from 1990 population and housing data where a ratio of the total population to the people on septic was obtained and applied to 2010 population data by

This data release consists of 9 comma-delimited ascii files that contain 1) ten-minute discharge values, 2) mean daily discharge and computed sediment loads, 3) grain size percentiles, 4) radionuclide source sample results, 5) radionuclide target sample results,6) laboratory sample splits, 7) elemental analysis results of samples, 8) suspended-sediment measurements, and 9) turbidity measurements.

This metadata record documents 3 sets of comma delimited tables representing the amount of reported best management practice (BMP) implementation within the Chesapeake Bay watershed as well as output data from scenarios of the Chesapeake Bay Program Phase 5.3.2 Watershed Model. The scenario data were used to estimate the effects of BMPs on water quality. The data are organized by three themes (chi

Conservation tillage practices and cover crops are used throughout the Chesapeake Bay watershed to reduce soil loss and improve water quality. Implementation of these Best Management Practices (BMPs) were reported to the Chesapeake Bay Program (CBP) by each state in the watershed (New York, Pennsylvania, Maryland, Delaware, West Virginia, and Virginia). Estimates of acres of implementation per CBP

Dataset contains a polygon shapefile representing poultry houses in the Upper Choptank watershed in Queen Anne's County, Maryland, and Kent County, Delaware.

Winter-spring nitrogen loads as measured at the Susquehanna River at Conowingo Maryland and Potomac River at Washington, D.C. have been determined to be an effective indicator of summer anoxic and hypoxic volume in Chesapeake Bay. The U.S. Geological Survey (USGS) provides an estimate of winter-spring nitrogen loadings to support an annual forecast of summer Chesapeake Bay conditions. The specific

Data collected from April 2014 through September 2016 were used to assess geomorphic characteristics and geomorphic changes over time in a selected reach of Tenmile Creek, a small rural watershed near Clarksburg, Maryland. Longitudinal profiles of the channel bed, water surface, and bank features were developed from field surveys. Changes in cross-section geometry between field surveys were docume

This metadata record documents 2 comma delimited tables that support the journal article "Bank-derived material dominates fluvial sediment in a suburban Chesapeake Bay watershed." They consist of a source and target dataset.

This metadata record documents 8 comma delimitated files that support the USGS Scientific Investigations Report 2018-5020 on field studies in the Bucks Branch watershed and the Andover Branch watershed. Data were collected from two fields at two locations and include: groundwater, soil water, soils and plant tissue chemistry. Data also include sulfur hexafluoride and dissolved gas concentrations u

This metadata record document contains 7 tables used to assess factors influencing long-term water quality changes in the Gwynns Falls, Baltimore, MD, 1998-2016. Included are daily discharge measurements (source: United States Geological Survey (USGS), 2016), weekly nutrient sampling concentrations (source: Baltimore Ecosystem Study (BES), 2015), and approximately monthly bacteria, ammonia, TKN, a

This metadata record covers 5 comma delimited ascii files that contain sediment source sample data, sediment target sample data, quantitation limits for samples, and daily temperature data. This data release is a companion to the journal article Sediment fingerprinting to delineate sources of fine-grained sediment in the agricultural and forested Smith Creek watershed, Virginia (2012-2015).