Data for the Estimation of Regional Flow-Duration Curves for Illinois (ver. 3.0, December 2021)

Digital datasets were used to develop basin characteristics values that are used in multiple regression equations and tested for the use in predicting flow-duration curves (FDCs) in ungaged areas of Illinois. Several basin characteristics are easily derived from StreamStats basin delineations, such as basin area and basin centroid (https://streamstats.usgs.gov/ss/). Other basin characteristics require ancillary datasets as input. The data provided through this data release are those data that have been collected, tested, and ultimately selected as a basis for FDC development. These include Soil Components (Available Water Capacity, Drainage Index, and Permeability); PRISM 3-Month Average Precipitation; and Thickness and Coarseness of Quaternary Sediments. There are 7 grids included in the Illinois portion of this data release: Soil Drainage index (drainind), PRISM December to February Average Precipitation (prdecfeb00), PRISM September to November Average Precipitation (prsepnov00), PermBXThick equation inputs (qss_permb and qss_thick), STATSGO Permeability (statsperm), and Available Water Capacity (watcapinil). NOTE: While previous versions are available from the author, all the records in previous versions can be found in version 3.0. First posted - May 26, 2020 (available from author) Revised - February 19, 2021 (version 2.0) Revised - December 2, 2021 (version 3.0)

                                            [
  "010:12"
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                                            {
  "fn": "Jennifer B Sharpe",
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                                            [
  "Basin characteristics",
  "Flow-duration curve",
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  "drainage basins",
  "stream-gage measurement",
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                                            [
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