{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Gardner Bent", "hasEmail": "mailto:gbent@usgs.gov"}, "description": "The U.S. Geological Survey (USGS), in cooperation with the Massachusetts Department of Conservation and Recreation, Office of Water Resources, developed regional regression equations for estimating selected low-flow statistics in Massachusetts. This data release contains the datasets used in the regression analyses for the regional low-flow equations for the mainland area of Massachusetts, which excludes the Plymouth-Carver-Kingston-Duxbury aquifer system area of southeastern Massachusetts and Cape Cod. Selected at-site streamflow statistics are provided for the 99-, 98-, 95-, 90-, 85-, 80-, 75-, 70-, 60-, 50-, 40-, 30-, 25-, 20-, 15-, 10-, 5-, 2-, and 1-percent flow durations; monthly 90- and 50-percent flow durations; monthly median of the monthly means; harmonic mean; median of the annual 7-day low-flow; and 7-day, 2-year (7Q2), 7-day, 10-year (7Q10), 30-day, 2-year (30Q2), and 30-day, 10-year low-flow frequencies for 174 USGS streamgages in and near Massachusetts. These streamflow statistics were computed using daily mean streamflow data through water year 2022 for non-frequency statistics and through climate year 2021 for the low-flow frequency statistics. Basin characteristics (hydrography, elevation, physical, land use, soil, surficial geology, and climate) are also provided for 174 streamgages. A geographic information system (GIS) coverage of the streamflow variability index (SVI) was developed as a basin characteristic for southern New England and eastern New York and used in the regional regression analyses. GIS coverages are provided for the regression equation explanatory variables: SVI, SSURGO hydrologic soils type A and B, and Parameter-elevation Regressions on Independent Slopes Model (PRISM) mean annual temperature 1981-2010. The Weighted-Multiple-Linear Regression (WREG) input and output files used to develop the final regional regression equations for Massachusetts are also provided.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P13AI5EP", "description": "Landing page for access to the data", "format": "XML", "mediaType": "application/http", "title": "Digital Data"}, {"@type": "dcat:Distribution", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.662ff473d34ea70bd5f263f4.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_662ff473d34ea70bd5f263f4", "keyword": ["Connecticut", "Massachusetts", "New Hampshire", "New York", "Rhode Island", "USGS:662ff473d34ea70bd5f263f4", "Vermont", "environment", "geoscientificInformation", "inlandWaters", "regression analysis", "stream discharge", "streamflow", "surface water", "water resources"], "modified": "2025-09-19T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-74.0000, 40.5000, -69.5000, 43.5000", "theme": ["geospatial"], "title": "Low-Flow Statistic Equations and Supplementary Data for Massachusetts"}