These data files include georeferenced water-quality data with associated time stamps (Central Standard Time) for basic water-quality parameters as measured by a towed multiparameter sonde (YSI 6920 sonde) from a manned boat in the Chicago Sanitary and Ship Canal. Data were collected on February 25-27, 2010, and again on March 2-3, 2010. The data collected in February 2010 had the sonde on a fixed mount about 1 foot below the surface. The data collected in March 2010 had the sonde on a towed cable about 7-9 feet below the surface. All data have been edited and reviewed. Omitted data have been flagged with a data value of -9999 in the data files.

The water temperature in degrees Celsius and specific conductance data in microsiemens per centimeter at 25 degrees Celsius (TC), measured at U.S. Geological Survey streamgage 05536995, located at Chicago Sanitary and Ship Canal near the Electrical Dispersal Barrier System in Romeoville, Illinois. The TC data are measured every five-minutes at four gage height levels above the gage datum (P1 = 21 feet, P2 = 17 feet, P3 = 13 feet, P4 = 9 feet). The gage datum is 551.76 feet above the North American Vertical Datum of 1988 (NAVD88). Daily mean and five-minutes water temperature and specific conductance data were downloaded from the National Water Information System and stored in a comma separated value files. Daily mean data are stored in a comma separated value file, "05536995-WY2019-temp-speccond-dailymean.csv" and the five-minutes data in "05536995-WY2019-temp-speccond-five-minute.csv". The 7-day moving average of daily mean values was calculated in Microsoft Office Excel spreadsheet. For each day, the 7-day moving average was calculated as the average of daily mean value for that day and the six previous days. This spreadsheet was saved as a csv file, "05536995-WY2019-temp-speccond-7daymovavg.csv". The water year 2019 annual minimum, maximum, mean, median, and standard deviation were calculated for each of the four temperature probes and the four specific conductance probes in Microsoft Office Excel and saved as a csv file, "05536995-WY2019-temp-speccond-annualstats.csv". The csv files containing five-minute, daily mean, 7-day moving average, and annual statistics (minimum, maximum, mean, median, and standard deviation) for water year 2019 can be downloaded from this page.

These data were collected using a 1200 kHz TRDI Rio Grande acoustic Doppler current profiler (ADCP) in mode 12 with 25 centimeter bins from a moving boat. The data were georeferenced with a Hemisphere Crescent A100 differential Global Positioning System (GPS) receiver with submeter accuracy. The data were processed in the Velocity Mapping Toolbox (Parsons and others, 2013) to obtain a mean velocity field for each cross section from four individual transects at each cross section. These data were collected by the U.S. Geological Survey (USGS) concurrently with environmental DNA (eDNA) sampling in this reach of the Chicago Sanitary and Ship Canal (CSSC) by the U.S. Fish and Wildlife Service (USFWS). NOTE: Any data assigned a value of "-9999" are bad or missing data and should not be used for analysis. Parsons, D. R., Jackson, P. R., Czuba, J. A., Engel, F. L., Rhoads, B. L., Oberg, K. A., Best, J. L., Mueller, D. S., Johnson, K. K. and Riley, J. D. (2013), Velocity Mapping Toolbox (VMT): a processing and visualization suite for moving-vessel ADCP measurements. Earth Surf. Process. Landforms, 38: 1244–1260. doi: 10.1002/esp.3367

On August 31, 2015, U.S. Geological Survey Illinois Water Science Center staff deployed a 2000 kHz side-looking acoustic Doppler velocity meter (ADVM) in the Chicago Sanitary and Ship Canal (CSSC) at the Electric Dispersal Barrier System (EDBS). These data were collected as a fully loaded commercial barge tow traversed the EDBS and passed the ADVM three times, and as several smaller vessels and an unloaded barge tow passed the ADVM. The ADVM was mounted to a rigid 2-inch PVC pipe in compliance with U.S. Army Corps of Engineers (USACE) operational safety protocols for working in or near the EDBS. The pipe with ADVM was lowered 4.5 feet below the water surface on the west (right) bank of the canal at a location approximately 477 feet upstream of the Romeo Road (135th Street) bridge (41.642050, -88.060383). The pipe was mounted to the walkway guard rail in a vertical orientation. An upstream and downstream guide line were used to provide additional tension to prevent movement or vibration on the PVC pipe. In this deployment configuration, the ADVM was profiling from the right wall of the canal out towards the center of the channel. ADVM data were viewed in real-time on a laptop computer during the deployment and logged simultaneously to the internal memory of the ADVM. The ADVM data were downloaded from the ADVM to a laptop computer while on site and reviewed briefly while in the field. Upon return to the USGS Illinois Water Science Center the ADVM data were downloaded from the field laptop and reviewed following standard USGS data quality assurance protocols.

A critical component of the Lake Michigan Diversion Accounting (LMDA) program, which oversees the diversion of Great Lakes water by the State of Illinois, is the U.S. Geological Survey (USGS) streamflow gaging station on the Chicago Sanitary and Ship Canal (CSSC) near Lemont, Illinois (05536890). The long-term application of an up-looking acoustic Doppler current profiler (ADCP) at this gaging station allows the flows at this site to be examined from a new perspective; one that is not possible with the horizontally-oriented instruments typically used at the site. This data release includes continuous 1-minute and 15-minute time-averaged velocity data from an up-looking ADCP deployed on the bed of the CSSC approximately 170 feet upstream of the streamgage (Latitude: 41.691151 degrees North, Longitude: -87.963081 degrees West; World Geodetic System 1984). The 1,200 kHz Teledyne RDI Rio Grande ADCP was mounted in a custom-built aluminum mount and fixed (bolted) to the bedrock bottom of the canal by divers on June 18, 2013. A direct connection between the gage house and the instrument was possible using a 300 foot (ft) armored power and communication cable. The trawl-resistant mount was designed to shed debris and places the ADCP transducers 2.0 ft above the bed of the canal. The bed elevation at the deployment location at the time of deployment was measured to be 550.61 ft above the North American Vertical Datum of 1988 (NAVD88). The ADCP was configured with thirty 0.98 ft bins and a 0.82 ft blanking distance. The center of the first bin was located 4.3 ft above the channel bed. The instrument was configured to use water mode 12 with 100 subpings per 1-minute ensemble and a time between subpings of 0.55 seconds. Therefore, each 1-minute ensemble represents an average over approximately 57 seconds of each minute. This configuration produces 1-minute time-averaged velocity profiles with an estimated standard deviation of horizontal velocity of approximately 0.04 feet per second. The 1-minute time-averaged data are used by the Campbell Scientific CR1000 data logger to compute the 15-minute time-averaged data. Time stamps (in Central Standard Time) are recorded at the end of the 1-minute and 15-minute averaging intervals. Data from the instrument including streamwise, transverse, and vertical velocity components, return signal strength indicator (RSSI), correlation, pitch, roll, water temperature at the transducer head, and battery voltage are included in the datasets.

The U.S. Geological Survey (USGS) monitors water surface flow reversals, commercial vessel traffic, and water temperature and specific conductance in the U.S. Army Corps of Engineers Electric Dispersal Barrier System (EDBS) on the Chicago Sanitary and Ship Canal, Chicago, Illinois. These data are planned to be released on USGS ScienceBase annually. This data release is the summary of all the data collected from water year 2019 (October 1, 2018, to September 30, 2019). Meyers and others (2019) describe all the data collected during October 1, 2018, to September 30, 2019. Water surface flow reversals at the EDBS were monitored using surface velocity radar. Commercial vessel traffic patterns through the EDBS were documented using a motion-activated video camera. Commercial vessel traffic data are only available from October 1, 2018, to July 3, 2019. Water temperature and specific conductance were reported in near real-time from USGS sensors at streamgage 05536995, installed just downstream from the EDBS.

The study at Lemont replicated and expanded upon seismic data collected at that location in 2011 as well as evaluated the pressure field created in the water by the water gun. The replicate data were collected with the water gun placements and input pressure identical to the 2011 study, but added static underwater pressure monitoring. Two 80-in³ water guns were suspended below a platform at depths of 4 and 14 feet. Pressure values were lower when only the gun suspended at 4 feet was fired as compared to firing the single gun at 14 feet and both guns simultaneously, with the latter two producing similar pressures. Data were collected to assess the pressure field produced by two 80-in³ water guns suspended at a depth of 14 feet, but separated by 80 feet. A 5 lb/in² threshold value, based on limitations set by the Army Corp of Engineers (USACE), was monitored throughout the experiment. Extent of the 5 lb/in² threshold value varied significantly with gun input air pressure. The ...

These data were collected using a 600 kHz TRDI Rio Grande acoustic Doppler current profiler (ADCP) in mode 12 with 50 centimeter bins from a moving boat. The data were georeferenced with a Hemisphere Crescent A100 differential Global Positioning System (GPS) receiver with submeter accuracy. The data have been depth-averaged over the entire measured portion of the water column and temporally averaged over 5-second intervals to reduce noise. These data were collected during dye tracing surveys of the right bank of the Chicago Sanitary and Ship Canal and include low-velocity regions of the canal such as barge slips in addition to the main channel. Data were processed using the Velocity Mapping Toolbox (Parsons and others, 2013). NOTE: Any data assigned a value of "-9999" are bad or missing data and should not be used for analysis. Parsons, D. R., Jackson, P. R., Czuba, J. A., Engel, F. L., Rhoads, B. L., Oberg, K. A., Best, J. L., Mueller, D. S., Johnson, K. K. and Riley, J. D. (2013), Velocity Mapping Toolbox (VMT): a processing and visualization suite for moving-vessel ADCP measurements. Earth Surf. Process. Landforms, 38: 1244–1260. doi: 10.1002/esp.3367

These data were collected using a 1200 kHz TRDI Rio Grande acoustic Doppler current profiler (ADCP) in mode 12 with 25 centimeter bins from a moving boat. The data were georeferenced with a Hemisphere Crescent A100 differential Global Positioning System (GPS) receiver with submeter accuracy. The data have been layer-averaged over the lower portion of the water column (0 to 4 meters above the bed). These data were collected by the U.S. Geological Survey (USGS) concurrently with environmental DNA (eDNA) sampling in this reach of the Chicago Sanitary and Ship Canal by the U.S. Fish and Wildlife Service (USFWS). Data were processed using the Velocity Mapping Toolbox (Parsons and others, 2013). NOTE: Any data assigned a value of "-9999" are bad or missing data and should not be used for analysis. Parsons, D. R., Jackson, P. R., Czuba, J. A., Engel, F. L., Rhoads, B. L., Oberg, K. A., Best, J. L., Mueller, D. S., Johnson, K. K. and Riley, J. D. (2013), Velocity Mapping Toolbox (VMT): a processing and visualization suite for moving-vessel ADCP measurements. Earth Surf. Process. Landforms, 38: 1244–1260. doi: 10.1002/esp.3367

Discharge measurements made at U.S. Geological Survey Chicago Sanitary and Ship Canal near Lemont, Illinois, streamgage (05536890) between 2005 and 2013 were reviewed and manually processed using QRev v3.12. Discharge was measured using Acoustic Doppler Current Profilers (ADCPs) deployed from a moving boat according to the procedures described in Mueller and others (2013). QRev generates an extensible markup language file (XML) that provides information on measurement characteristics (Mueller, 2016a,b). Data from these XML files were exported into a comma-separated values (CSV) table to create a summary of measurement information. This CSV table also indicates which measurements were used in the development of index-velocity ratings for the Acoustic Velocity Meter (AVM) and Acoustic Doppler Velocity Meter (ADVM) located at the Lemont streamgage. This data release contains the processed QRev XML files, a stylesheet (XSL) to view the QRev files easily, and the CSV measurement summary table. References: Mueller, D.S., Wagner, C.R., Rehmel, M.S., Oberg, K.A., and Rainville, Francois, 2013, Measuring discharge with acoustic Doppler current profilers from a moving boat (ver. 2.0, December 2013): U.S. Geological Survey Techniques and Methods, book 3, chap. A22, 95 p., https://dx.doi.org/10.3133/tm3A22. Mueller, D.S., 2016a, QRev—Software for computation and quality assurance of acoustic Doppler current profiler moving-boat streamflow measurements—User’s manual for version 2.8: U.S. Geological Survey Open-File Report 2016–1052, 50 p., http://dx.doi.org/10.3133/ofr20161052. Mueller, D.S., 2016b, QRev—Software for computation and quality assurance of acoustic Doppler current profiler moving-boat streamflow measurements—Technical manual for version 2.8: U.S. Geological Survey Open-File Report, 2016–1068, 79 p., http://dx.doi.org/10.3133/ofr20161068.

This dataset includes water temperature and specific conductance (TC) data measured at USGS streamgage number 05536995 (Chicago Sanitary and Ship Canal at Romeoville, IL). Four Campbell® Scientific SC547 TC probes are positioned in a natural niche on east (left) bank 1200 feet downstream of the stage gage at this site. The TC data are measured every five minutes at four gage height levels (P1 = 21 feet, P2 = 17 feet, P3 = 13 feet, P4 = 9 feet). The gage datum is 551.76 feet above the North American Vertical Datum of 1988 (NAVD88). The annual statistics of TC (minimum, maximum, mean, median, and standard deviation) for Water Year 2018 are provided in a comma separated value (csv) file.

description: A boat equipped with a differential Global Positioning System (GPS) receiver (Hemisphere Crescent A100 Smart Antenna) and a Turner Designs C3 submersible fluorometer was used to survey the spatial distribution of the Rhodamine WT dye in the Chicago Sanitary and Ship Canal (CSSC) throughout the study area. The fluorometer was installed in a fixed, downlooking orientation approximately 1 foot below the water surface. Fluorometer readings were taken at a frequency of 1 per second. Data were acquired on a personal computer running the Turner Designs C-FINS software extension for ArcGIS 10. This data acquisition software allows the C3 data to be georeferenced and plotted in real time as color-coded concentrations on a user-supplied base map. The data were logged in the CFINS program and stored as shapefiles, and raw (not georeferenced) data were stored internally on the boat-mounted C3 and downloaded at the end of each shift (every 12 hours). Survey techniques were restricted to streamwise transects along the bank of the CSSC nearest the Des Plaines River in both the upstream and downstream direction. The boat survey crew followed the wall of the canal as closely as possible, including data collection in barge slips. Mooring of barges and active barge traffic restricted surveys in some locations and led to some contamination of fluorometer data by increasing local turbidity concentrations near the active vessels. The C3 turbidity sensor was not calibrated and therefore reported only relative changes in background turbidity and not absolute turbidity values (in relative Nephelometric turbidity units (NTU)). Several vertical profiles were also made in target areas to ensure dye was not being transported near the bed without any surface detection.; abstract: A boat equipped with a differential Global Positioning System (GPS) receiver (Hemisphere Crescent A100 Smart Antenna) and a Turner Designs C3 submersible fluorometer was used to survey the spatial distribution of the Rhodamine WT dye in the Chicago Sanitary and Ship Canal (CSSC) throughout the study area. The fluorometer was installed in a fixed, downlooking orientation approximately 1 foot below the water surface. Fluorometer readings were taken at a frequency of 1 per second. Data were acquired on a personal computer running the Turner Designs C-FINS software extension for ArcGIS 10. This data acquisition software allows the C3 data to be georeferenced and plotted in real time as color-coded concentrations on a user-supplied base map. The data were logged in the CFINS program and stored as shapefiles, and raw (not georeferenced) data were stored internally on the boat-mounted C3 and downloaded at the end of each shift (every 12 hours). Survey techniques were restricted to streamwise transects along the bank of the CSSC nearest the Des Plaines River in both the upstream and downstream direction. The boat survey crew followed the wall of the canal as closely as possible, including data collection in barge slips. Mooring of barges and active barge traffic restricted surveys in some locations and led to some contamination of fluorometer data by increasing local turbidity concentrations near the active vessels. The C3 turbidity sensor was not calibrated and therefore reported only relative changes in background turbidity and not absolute turbidity values (in relative Nephelometric turbidity units (NTU)). Several vertical profiles were also made in target areas to ensure dye was not being transported near the bed without any surface detection.

Data include Rhodamine WT dye concentrations measured every 3 or 10 minutes by means of Turner Designs C-3 and C-6 fluorometers with internal dataloggers at three fixed locations on the Des Plaines River (DPR) (DP-1, DP-2, and DP-3); in three groundwater monitoring wells (ACL-1, WP10-85, and WP9-275); and at two fixed locations on the Chicago Sanitary and Ship Canal (CSSC) (SC-1 and SC-2) (see included Google Earth file AllDeployments_Locations.kmz). The detection limit for these fluorometers is reported to be 0.01 parts per billion (ppb). However, the fluorometer readings were affected by turbidity, and readings of less than about 1.0 part per billion (ppb) were considered to have been influenced by turbidity and variability in background fluorescence rather than indicative of the detection of dye. Measurements began prior to the arrival of dye at all locations (to ensure background concentrations were properly documented) and continued for 3–13 days after tracer injection ceased, depending on the location. Fluorometers were calibrated the day prior to the start of the study by using water from the site where the fluorometer was to be deployed to make the final dilution of the calibration solution. Turbidity sensors were not calibrated and therefore report only relative changes in background turbidity and not absolute turbidity values (all fluorometers either reported relative turbidity values in relative fluorescence units (RFU) or in Nephelometric turbidity units (NTU)). Fluorometers installed in the wells were deployed at the depths of hydraulically active fractures in each well. The fluorometer installed in the CSSC at the bottom of the ACL slip (SC-2) was mounted to a weighted frame and deployed adjacent to the canal wall near a potential hydraulically active fracture on the canal wall. The fluorometer placed upstream in the CSSC (SC-1) was a C-6 fluorometer, and it was deployed at U.S. Geological Survey (USGS) streamgage 05536890 at a depth of approximately 10 feet below the water surface in an attempt to document any dye infiltration upstream of this site. All deployment locations are given in the provided Google Earth KMZ file.

These data were collected using a 600 kHz TRDI Rio Grande acoustic Doppler current profiler (ADCP) in mode 12 with 50 centimeter bins from a moving boat. The data were georeferenced with a Trimble Ag132 differential Global Positioning System (GPS) receiver with submeter accuracy. The data have been depth-averaged over the entire measured portion of the water column and temporally averaged over 5-second intervals to reduce noise. These data were collected during water-quality surveys of the right bank of the Chicago Sanitary and Ship Canal (CSSC) and include low-velocity regions of the canal such as barge slips in addition to the main channel. Data were processed using the Velocity Mapping Toolbox (Parsons and others, 2013). Any data assigned a value of "-9999" are bad or missing data and should not be used for analysis. Parsons, D. R., Jackson, P. R., Czuba, J. A., Engel, F. L., Rhoads, B. L., Oberg, K. A., Best, J. L., Mueller, D. S., Johnson, K. K. and Riley, J. D. (2013), Velocity Mapping Toolbox (VMT): a processing and visualization suite for moving-vessel ADCP measurements. Earth Surf. Process. Landforms, 38: 1244–1260. doi: 10.1002/esp.3367

In 2017, the U.S. Fish and Wildlife Service, U.S. Geological Survey, and U.S. Army Corps of Engineers undertook a large-scale interagency field study to determine the influence of commercial barge vessels on the efficacy of the Electric Dispersal Barrier System (EDBS) in the Chicago Sanitary and Ship Canal (CSSC) in preventing fish passage. This study included a series of trials in which a tow, consisting of a tug vessel and fully-loaded barges, transited the EDBS in both upstream-bound (n = 65) and downstream-bound (n = 66) directions. Wall-mounted velocity probes were located at (41.6423629, -88.060329). The configuration of the barges for each run, and the time at which the bow and stern of the tow pass the wall-mounted velocity probes are provided in this Comma Separated Value (CSV) file.

These data are high-resolution bathymetry (riverbed elevation) in compressed LAS (*.laz) format, generated from the July 17–19, 2023, hydrographic survey of Bubbly Creek and various sidings, harbors, and turning basins on the Chicago Sanitary and Ship Canal (CS&SC) in Cook County, Illinois. The survey includes all Bubbly Creek from the confluence with the CS&SC in the north to the Racine Avenue Pump station in the south; various sidings and turning basins along the CS&SC between Kedzie Avenue and South Halsted Street; and the Marine Safety Station harbor near the Chicago Harbor Lock on Lake Michigan. This survey is a continuation and enhancement of the bathymetric survey of the CS&SC in Cook County, Illinois, conducted August 22–24, 2022 (Huizinga and Rivers, 2023). Hydrographic data were collected using a high-resolution multibeam echosounder mapping system (MBMS), which consists of a multibeam echosounder (MBES) and an inertial navigation system (INS) mounted on a marine survey vessel. Data were collected as the vessel traversed the river along overlapping longitudinal survey lines distributed throughout the reach. Data collection software integrated and stored the depth data from the MBES and the horizontal and vertical position and attitude data of the vessel from the INS in real time. Data processing required specialized computer software to extract bathymetry data from the raw data files and to summarize and map the information. The full-resolution data are provided in American Society for Photogrammetry and Remote Sensing (ASPRS) compressed LAS format as BubblyCr_CSSCsidings_bathymetry_2023-07_fullres.laz. This bathymetry dataset is the full-resolution, near-raw data output from the processing software. This dataset has undergone limited cleanup and editing to remove obvious stray data and aquatic vegetation, but data editing was minimized to retain detail. Furthermore, this dataset is large, and may not be readily viewable without specialized software. The reduced-resolution data also are provided in ASPRS compressed LAS format as BubblyCr_CSSCsidings_bathymetry_2023-07.laz. This bathymetry dataset is a subset of the full-resolution data in the BubblyCr_CSSCsidings_bathymetry_2023-07_fullres.laz file, reduced to a nominal 0.5-meter point spacing. The compressed LAS format is a standardized binary format for storing 3-dimensional point cloud data and point attributes along with header information and variable length records specific to the data. Data points are stored as a 3-dimensional data cloud as a series of x (longitude), y (latitude), and z (elevation) points. Please refer to http://www.asprs.org/Committee-General/LASer-LAS-File-Format-Exchange-Activities.html for additional information. Reference Cited: Huizinga, R.J., and Rivers, B.C., 2023, Chicago River and Chicago Sanitary and Ship Canal Bathymetry in Cook County, Illinois, August 2022: U.S. Geological Survey data release, https://doi.org/10.5066/P94TL2PV.

In 2016, the U.S. Fish and Wildlife Service, U.S. Geological Survey, and U.S. Army Corps of Engineers undertook a large-scale interagency field study to determine the influence of commercial barge vessels on the efficacy of the Electric Dispersal Barrier System (EDBS) in the Chicago Sanitary and Ship Canal (CSSC) in preventing fish passage. This study included a series of trials in which a tow, consisting of a tug vessel and six fully-loaded barges, transited the EDBS in both upstream-bound (n = 23) and downstream-bound (n = 22) directions. A 1,200 kHz Teledyne RDI Channel Master Acoustic Doppler Velocity Meter (ADVM) was mounted on the barge at the position of the rake-to-box junction. The ADVM faced outward from the side of the barge (side-looking) and was placed at a depth of 1.4 meters below the water surface. The ADVM was located at a distance of 0.7 meters from the box side of the gap (measured toward the rake), and recessed 0.93 meters into the gap as measured perpendicular to the side of the barge. The side-looking ADVM measured horizontal profiles of streamwise and cross-stream components of velocity at 35 bins spaced by 0.5 meters starting at 0.8 meters and up to 17.8 meters measured perpendicular to the side of the barge, unless the barge was within 17.8 meters of the West canal wall. All velocity measurements represent an average of 10 pings, recorded every 10 seconds during measurement. A Hemisphere V102(TM) differential GPS (dGPS) with Doppler-based heading was mounted on the box side of the rake-to-box junction and synchronized with the side-looking ADVM. The dGPS provided sub-meter accuracy positions, heading (accuracy ± 0.75°), and speed of the tow at a sampling frequency of 10 Hz. The time-stamped velocity measurements from the barge-mounted ADVM was matched to the nearest-in-time dGPS position and corrected for the velocity of the moving tow. Once corrected for the movement of the tow, the velocity data were rotated into the local streamwise-normal coordinate system, such that reported streamwise velocities are parallel to the banklines of the CSSC at the EDBS and positive downstream, and reported cross-stream velocities are perpendicular to the banklines and positive toward the east canal bank. All ADVM velocity time series data are included in this data release as Comma Separated Value (CSV) files.

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This dataset contains a summary of the characteristics of near-surface flow reversals at the Electrical Dispersal Barrier System (EDBS) on the Chicago Sanitary and Ship Canal at Romeoville, Illinois during Water Year 2019 (October 1, 2018, to September 30, 2019). Water velocity near the water surface was measured on a five-minute sampling interval in the EDBS using surface velocity radar at nine measurement cells on a cross section near U.S. Geological Survey streamgage 05536995 (Chicago Sanitary and Ship Canal at Romeoville, Illinois). Flow reversal events were analyzed for each individual cell as well as for the average velocity over all nine cells. For the analysis of individual cells, a flow reversal event is defined as a period of time in which the velocity in an individual cell is negative (flowing upstream). For the analysis of the average velocity, a flow reversal event is defined as a period of time in which the average velocity over all nine cells is negative (flowing upstream). Velocity observations and statistics for each flow reversal event are provided in Comma Separated Values (CSV) files stored in a zipped folder named 05536995-WY2019-Flow-Reversal-Events.zip.

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