Maitreyee Bera 20250715 The data is available as Watershed Data Management (WDM) database format (.wdm) from the link https://www.sciencebase.gov/catalog/item/680bbe0cd4be02201034d555. Denver, CO U.S. Geological Survey https://doi.org/10.5066/P13JN3YY This data release (DR) is the update of the U.S. Geological Survey - ScienceBase DR (Bera, 2024b), with the processed data for the period October 1, 2022, through September 30, 2023. This DR describes the watershed data management (WDM) database file SC23.WDM. The precipitation data are collected from a tipping-bucket rain-gage network and the hydrologic data (stage and discharge) are collected at USGS streamflow-gaging stations in and around Salt Creek watershed in DuPage County, Illinois, as described in Bera (2014). Hourly precipitation and hydrologic data for the period October 1, 2022, through September 30, 2023, are processed following the guidelines described in Bera (2014) and Murphy and Ishii (2006) and appended to SC22.WDM (Bera, 2024b) and renamed as SC23.WDM. Meteorological data (wind speed, solar radiation, air temperature, dewpoint temperature, and potential evapotranspiration) from October 1, 2022, through September 30, 2023, are copied from ARGN23.WDM (Bera, 2024a) and uploaded to SC23.WDM. Data in dataset number (DSN) 107 and 801–810 are used in comparisons of precipitation data. DSN 107 contains hourly precipitation data collected at Argonne National Laboratory at Argonne, Illinois. DSN 801-810 contains the processed Next Generation Weather Radar (NEXRAD)-multisensor precipitation estimates (MPE) data from 10 NEXRAD–MPE subbasins in the Salt Creek watershed (Bera and Ortel, 2018). Data in these DSNs are not quality-assured and quality-controlled. The data are downloaded and uploaded daily into a WDM database that is used for the near-real-time streamflow simulation system. Data from DSN 107 and 801-810 are copied from this WDM and stored in the SC23.WDM. DSN 107 and 801-810 in the SC23.WDM are updated with the data through September 30, 2023. Data in DSN 5400 (water-surface elevation at the Elmhurst Quarry at Elmhurst, Illinois) and 5700 (water surface elevation at Thorndale Avenue in Wood Dale, Illinois) are copied and updated through September 30, 2023, similarly (Murphy and Ishii, 2006). The Gage at Thorndale Avenue in Wood Dale, Illinois is maintained by DuPage County Stormwater Department. The complete list of missing precipitation data periods and the nearby stations used to fill in those missing periods from October 1, 2022, through September 30, 2023, is given in Table1.csv. This file is in the comma separated values (CSV) file format and can be downloaded from this landing page. The list of snow affected days of precipitation data and the missing and estimated period of the stage and flow data in SC23.WDM database during the period October 1, 2022, through September 30, 2023, are given in the USGS annual Water Data Report at https://waterdata.usgs.gov/nwis. To open the WDM database SC23.WDM the user may use the Sara Timeseries Utility executable file attached in this page. Table1.csv can be opened with any text editor or Microsoft Excel. References Cited: Bera, M., 2024a, Meteorological Database, Argonne National Laboratory, Illinois: U.S. Geological Survey data release, https://doi.org/10.5066/P146RBHK. Bera, M., 2024b, Watershed Data Management (WDM) Database (SC22.WDM) for Salt Creek Streamflow Simulation, DuPage County, Illinois, January 1, 1997, through September 30, 2022: U.S. Geological Survey data release, https://doi.org/10.5066/P14D6FRA. Bera, M., and Ortel, T.W., 2018, Processing of next generation weather radar-multisensor precipitation estimates and quantitative precipitation forecast data for the DuPage County streamflow simulation system: U.S. Geological Survey Open-File Report 2017–1159, 16 p., https://doi.org/10.3133/ofr20171159. Bera, M., 2014, Watershed Data Management (WDM) database for Salt Creek streamflow simulation, DuPage County, Illinois, water years 2005–11: U.S. Geological Survey Data Series 870, 18 p., https://doi.org/10.3133/ds870. Murphy, E.A., and Ishii, A.L., 2006, Watershed Data Management (WDM) Database for Salt Creek Streamflow Simulation, DuPage County, Illinois: U.S. Geological Survey Open-File Report 2006-1248, 20 p., https://pubs.usgs.gov/of/2006/1248/. The datasets in this database may be used as input to the Hydrological Simulation Program-FORTRAN (HSPF) model or other similar rainfall-runoff model for simulating streamflow in DuPage County and nearby areas in northeastern Illinois. This database will be available to the public and other cooperators for doing similar simulations or meteorological analyses. 19970101 20230930 publication date Planned Annually -88.1276 -87.8957 42.1567 41.7972 Watershed data management dewpoint temperature air temperature solar radiation wind speed potential evapotranspiration precipitation hydrology stage elevation National Geodetic Vertical Datum of 1929 discharge streamflow runoff flood forecasting dataset number USGS Metadata Identifier USGS:680bbe0cd4be02201034d555 Illinois Argonne National Laboratory, Illinois DuPage County, Illinois O'Hare International Airport, Illinois St. Charles, Illinois DeKalb, Illinois none Atmosphere none hourly none none Maitreyee Bera Central Midwest Water Science Center Mailing and Physical

405 N. Goodwin Ave

Urbana Illinois 61801-2347 USA 217-328-9749 mbera@usgs.gov Argonne National Laboratory staff who collected the primary meteorologic data; Jennie Atkins, the director of Water and Atmospheric Resource Monitoring (WARM) program of Illinois State Water Survey (ISWS) for providing the data from St. Charles and DeKalb, Illinois; Midwestern Regional Climate Center (MRCC) of ISWS website (https://mrcc.purdue.edu/CLIMATE/index.jsp) for providing dewpoint temperature from gage at O'Hare International Airport, DuPage County stormwater department for the precipitation data in and around DuPage county, Illinois, and U.S. Geological Survey Central Midwest Water Science Center field staff for collecting precipitation, stage and discharge data. No formal attribute accuracy tests were conducted No formal logical accuracy tests were conducted Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. No formal positional accuracy tests were conducted No formal positional accuracy tests were conducted Hourly precipitation and hydrologic data for the period October 1, 2022, through September 30, 2023, are processed following the guidelines described in Bera (2014) and Murphy and Ishii (2006), appended to SC22.WDM (Bera, 2024b) and renamed as SC23.WDM. Meteorological data (wind speed, solar radiation, air temperature, dewpoint temperature, and potential evapotranspiration) from October 1, 2022, through September 30, 2023, are copied from ARGN23.WDM (Bera, 2024a) and uploaded to SC23.WDM. The WDM database SC23.WDM contains seventy-five datasets with a DSN assigned to each in a systematic order. The data organization and sources for precipitation, stage, and discharge are discussed in Bera (2014) and Murphy and Ishii (2006). Units of measure for each dataseries is as given in the WDM attribute "STANAM" (Murphy and Ishii, 2006). The complete list of missing precipitation data periods and the nearby stations used to fill in those missing periods during October 1, 2022, through September 30, 2023, is given in Table1.csv file. The list of snow affected days of precipitation data and the missing and estimated period of the stage and flow data in SC22.WDM database during the period October 1, 2022, through September 30, 2023, are given in the USGS annual Water Data Report at https://waterdata.usgs.gov/nwis. To open the WDM database SC23.WDM the user may use the Sara Timeseries Utility executable file attached in this page. Table1.csv can be opened with any text editor or Microsoft Excel. Note: For Stage data series (DSN 4100, 4200, 4500, 4600, 4800, 4801, 4900, 5400, and 5700) missing hourly value is Datum (listed in annual Water Data Report at https://wdr.water.usgs.gov) plus -99.9; For streamflow data series missing hourly value is -99.9; The missing values for the precipitation time series 107 are flagged with -99.0, -99.9, and/or -9990.0. The missing values for the NEXRAD-MPE precipitation time series in DSN 801-810 are flagged with -99.0. The missing period for all other precipitation time series are filled with the nearby raingage data as a part of the quality assurance and quality control process. 20250425 The precipitation data are collected from a county-wide network of real-time tipping-bucket rain gages maintained by the USGS and DuPage County (Bera, 2014). The other meteorological data (wind travel, solar radiation, air temperature, and dewpoint temperature) are from the Argonne National Laboratory located in Argonne, Illinois (Bera, 2024). The hydrologic data are from both USGS stage and discharge gages (Bera, 2014). Discharge values for the missing hours are filled with the value -99.9. Elevation values for the missing hours are filled with the value datum (of the gage) plus -99.9. The WDM database SC23.WDM contains seventy-five datasets with a DSN assigned to each in a systematic order. The datasets with DSN 114, 128, 129, 145, 150, 164, 170, 186, 187, 188, 189, 190, 2100, 2500, 2801, 2900, 4100, 4200, 4500, 4600, 4801, and 4900, are updated with the quality-assured and quality-controlled data from October 1, 2022, through September 30, 2023. The datasets with DSN 207, 307, 310, 407, 410, 507, 510, 607, and 610 are the meteorological data other than precipitation and are copied from ARGN23.WDM (Bera, 2024a). The datasets with DSN 107, 801-810, 5400, and 5700 are copied from a WDM database that is used in a near-real-time streamflow simulation system and uploaded into the SC23.WDM database. The DSNs 7020-7025 are used for storing the HSPF computed snow variables for snow depth and snow water equivalent. No data is added to any of these DSNs. Bera (2014) and Murphy and Ishii (2006) describe the SC23.WDM database in detail. To open this file the user may use the executable file for the Sara Timeseries Utility, attached in this data release. https://doi.org/10.5066/P13JN3YY U.S. Geological Survey U.S. Geological Survey ScienceBase Mailing and Physical

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Denver Colorado 80225 USA 18882758747 sciencebase@usgs.gov Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it may contain copyrighted materials if noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner whenever applicable. The data have been approved for release and publication by the U.S. Geological Survey (USGS). Although the data have been subjected to rigorous review and are substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, the data are released on the condition that neither the USGS nor the U.S. Government may be held liable for any damages resulting from authorized or unauthorized use. Although the data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The U.S. Geological Survey or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Users of the data are advised to read all metadata and associated documentation thoroughly to understand appropriate use and data limitations. Digital Data https://doi.org/10.5066/P13JN3YY NONE To open the WDM file the user may use the executable file for the Sara Timeseries Utility, attached in this data release. Table1.csv can be opened with any text editor or Microsoft Excel. 20250715 Maitreyee Bera Central Midwest Water Science Center Hydrologist Mailing and Physical

405 N. Goodwin Ave

Urbana Illinois 61801-2347 USA 217-328-9749 mbera@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998