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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 Selected chemicals, solids, and microorganisms that are used in agriculture or produced as by-products of agriculture in the United States as of 2009 This data set brings together and categorizes many of the chemicals, solids, and microorganisms that are used in agriculture or produced as by-products of agriculture in the United States (as of 2009). Each entry in the data set includes the name, Chemical Abstracts Service Registry Number, purpose(s) in agriculture, and a reference. For pesticides and their degradates, the pesticidal use, parent pesticide, and the United States Environmental Protection Agency Pesticide Chemical Code are included. The data were compiled as part of a U.S. Geological Survey study to improve the understanding of field-scale and watershed-scale hydrology and the environmental behavior of individual chemicals. The goals of the study... Categories: Data; Tags: USGS Science Data Catalog (SDC), United States, agricultural chemicals, antimicrobial, chemical transformation, All tags... fertilizer, fungicide, herbicide, hormone, inert, insecticide, nutrient, nutrients, pesticide, pesticides, rodenticide, transformation product, Fewer tags Data set used to develop a conceptual framework for effectively anticipating water-quality changes resulting from changes in agricultural activities This USGS data release contains 2013 streamflow, baseflow, and precipitation data from three hydrologically-diverse streams in the United States used to develop a conceptual framework for effectively anticipating water-quality changes resulting from changes in agricultural activities. The framework combined generalized concepts on the movement of water, the environmental behavior of chemicals and eroded soil, and the designed functions of various agricultural activities. The framework addresses the impacts on water quality of a broad range of agricultural chemicals and sediment across a variety of hydrologic settings. • Chesterville Branch near Crumpton, Maryland, (USGS site ID - 01493112) had substantial baseflow... Categories: Data; Types: Citation; Tags: Indiana, Kansas, Maryland, National Water Quality Program, USGS Science Data Catalog (SDC), All tags... agricultural management practices, agriculture, base flow, baseflow, chemical sorptivity, chemical transformation, chemical transport, flowpath, groundwater, groundwater flow, groundwater quality, hydrologic transit times, sediment transport, sorption, water chemistry, water quality, 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