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 "serviceDescription": "This map represents modeled streamflow across the contiguous United States, for historical and future time periods, based on gridded simulations of daily total runoff. The flow regime is of fundamental importance in determining the physical and ecological characteristics of a river or stream, but actual flow measurements are only available for a small minority of stream segments, mostly on large rivers. Flows for all other streams must be extrapolated or modeled. Modeling is also necessary to estimate flow regimes under future climate conditions. We modeled streamflow across the contiguous United States, for the historical period (1977\u20132006), and two projected future time periods, mid-century (2030\u20132059), and end-of-century (2070\u20132099). These are based on gridded simulations of daily total runoff. These use RCP 8.5 projections of temperature and precipitation, downscaled to a 1/8 degree (~12 km) cell size, which are used as inputs to the Variable Infiltration Capacity (VIC) macroscale hydrologic model. This dataset updates the previous Western U.S. Stream Flow Metric Dataset (Wenger et al., 2010) (a link to the old datasets is available on the project website). It expands the spatial extent of this analysis, uses updated climate scenarios, and includes additional climate metrics. For each stream segment in the National Hydrography Dataset Plus Version 2 (NHDPlusV2) in the contiguous U.S. we calculated hydrographs for the three time periods. From these we calculated summary flow metrics to describe flow regimes for each stream segment and each time period and joined these to the NHD stream segments for visualization and analysis.These results allow scientists and managers to easily compare historical and projected flow patterns, including monthly, seasonal, and annual flow, flood and drought events, and timing of peak and low flows.Note: We recommend that line segments with an upstream area greater than 10,000 km2 be removed from the dataset for consideration of high flow metrics, since the downstream routing was simply an accumulation function. This is reasonable for larger watersheds at time scales of months and greater, but would be inaccurate for estimating floods at daily time scales on larger watersheds. This can be done using the field \u2018TotDASqKM.\u2019 Note also that the 10+ year flood models are not appropriate for use in engineering and design applications.",
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 "copyrightText": "The USDA Forest Service makes no warranty, expressed or implied, including the warranties of merchantability and fitness for a particular purpose, nor assumes any legal liability or responsibility for the accuracy, reliability, completeness or utility of these geospatial data, or for the improper or incorrect use of these geospatial data. These geospatial data and related maps or graphics are not legal documents and are not intended to be used as such. The data and maps may not be used to determine title, ownership, legal descriptions or boundaries, legal jurisdiction, or restrictions that may be in place on either public or private land. Natural hazards may or may not be depicted on the data and maps, and land users should exercise due caution. The data are dynamic and may change over time. The user is responsible to verify the limitations of the geospatial data and to use the data accordingly.",
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  "Title": "U.S. Forest Service Stream Flow Metrics",
  "Author": "",
  "Comments": "A map service depicting modeled streamflow metrics from the mid-century time period (2030\u20132059) in the United States. In addition to standard NHD attributes, the streamflow datasets include metrics on mean daily flow (annual and seasonal), flood levels associated with 1.5-year, 10-year, and 25-year floods; annual and decadal minimum weekly flows and date of minimum weekly flow, center of flow mass date; baseflow index, and average number of winter floods. These files and additional information are available on the project website, https://www.fs.usda.gov/rm/boise/AWAE/projects/modeled_stream_flow_metrics.shtml. Streams without flow metrics (null values) were removed from this dataset to improve display speed; to see all stream lines, use an NHD flowline dataset.",
  "Subject": "Modeled streamflow across the contiguous United States, for historical and future time periods, based on gridded simulations of daily total runoff.",
  "Category": "",
  "Version": "2.9.0",
  "AntialiasingMode": "Fast",
  "TextAntialiasingMode": "Force",
  "Keywords": "USDA Forest Service,USFS,Rocky Mountain Research Station,RMRS,Office of Sustainability and Climate,OSC,Enterprise Data Warehouse,EDW,Contiguous United States,USA,inlandWaters,environment,water,hydrology,streams,stream flow,streamflow,climate change,flood,low flow,drought,baseflow,national hydrography dataset,NHD,variable infiltration capacity,VIC,future"
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