This archive contains all relevant files to run and document the flood-frequency analysis using the PeakFQ 7.3 software for estimating the annual exceedance probability streamflows for U.S. Geological Survey streamgage 09416000 - Muddy River near Moapa, Nevada. The archive includes: 1) the PeakFQ input file (09416000_peak.txt); 2) the PeakFQ output file (09416000_PEAK.PRT); 3) the PeakFQ specifications file (09416000_PEAK.PSF); 4) the PeakFQ input data graph file (09416000_inp.EMF); 5) the PeakFQ Annual exceedance probability plot file (094196000.EMF); 6) the summary table documenting the flood-frequency (09416000_Flood_Frequency.xlsx);

This U.S. Geological Survey data release consists multiple datasets used to simulate the extents of flood inundation along the Muddy River, near Moapa, Nevada. Flood-inundation extents equal the maximum area of flood inundation and were estimated using a coupled one-dimensional (1D) and two-dimensional (2D) hydraulic model. The modeled extents represent six annual exceedance probabilities simulated for the current (2019) levee location adjacent to the Muddy River and a new levee location associated with a proposed restoration of a selected reach along the Muddy River. The data release includes: 1) a polygon dataset of the flood-inundation extents (MuddyRiver_Flood_Inundation_p.shp); 2) a zip file containing all relevant files to document and run the PeakFQ flood-frequency analysis used as input into the hydraulic model (0941600_Flood_Frequency_Archive.zip); 3) a zip file containing all relevant files to document and run the coupled 1D and 2D Hydrological Engineering Center-River Analysis System (HEC-RAS) hydraulic model used to generate a polygon dataset of flood-inundation extents (SWmodel_Archive.zip); 4) a polygon dataset of the current and proposed levee locations (MuddyRiver_Levee_p.shp); 5) a point dataset of survey points (RTK-TS_survey_x.shp) collected from April 1 to August 9, 2019, using real-time kinematic global navigation satellite system (GNSS) and total station (TS); and 6) a point dataset of seven static reference locations (Static_GNSS_x.shp) collected from March 29 to August 9, 2019, using a single-baseline online positioning user service – static (OPUS-S) GNSS survey.

This U.S. Geological Survey data release consists multiple datasets used to simulate the extents of flood inundation along the Muddy River, near Moapa, Nevada. Flood-inundation extents equal the maximum area of flood inundation and were estimated using a coupled one-dimensional (1D) and two-dimensional (2D) hydraulic model. The modeled extents represent six annual exceedance probabilities simulated for the current (2019) levee location adjacent to the Muddy River and a new levee location associated with a proposed restoration of a selected reach along the Muddy River. The data release includes: 1) a polygon dataset of the flood-inundation extents (MuddyRiver_Flood_Inundation_p.shp); 2) a zip file containing all relevant files to document and run the PeakFQ flood-frequency analysis used as input into the hydraulic model (0941600_Flood_Frequency_Archive.zip); 3) a zip file containing all relevant files to document and run the coupled 1D and 2D Hydrological Engineering Center-River Analysis System (HEC-RAS) hydraulic model used to generate a polygon dataset of flood-inundation extents (SWmodel_Archive.zip); 4) a polygon dataset of the current and proposed levee locations (MuddyRiver_Levee_p.shp); 5) a point dataset of survey points (RTK-TS_survey_x.shp) collected from April 1 to August 9, 2019, using real-time kinematic global navigation satellite system (GNSS) and total station (TS); and 6) a point dataset of seven static reference locations (Static_GNSS_x.shp) collected from March 29 to August 9, 2019, using a single-baseline online positioning user service – static (OPUS-S) GNSS survey.

This archive contains all relevant files to run and document the flood-frequency analysis using the PeakFQ 7.5.1 software for estimating the annual exceedance probability streamflows for U.S. Geological Survey streamgage 09418700 - Meadow Valley Wash near Rox, Nevada. Model runs can be initiated using the PeakFQ application by opening the application, selecting specification file (File->Open->(change file type to .psf), and then "Run PEAKFQ." The archive includes: 1) the PeakFQ input file (09418700.txt); 2) the PeakFQ output file (09418700.PRT); 3) the PeakFQ specifications file (09418700.PSF); 4) the PeakFQ input data graph file (09418700_input.EMF); 5) the PeakFQ Annual exceedance probability plot file (09418700_freq.EMF); and 6) the summary table documenting the flood-frequency (09418700_Flood_Frequency.xlsx);

This model archive contains all relevant files to run and document the Hydrological Engineering Center-River Analysis System (HEC-RAS) coupled one and two-dimensional hydraulic model used to simulate flood-inundation extents for the Muddy River, near Moapa, Nevada. The HEC-RAS model was applied to simulate flood-inundation extents for a current (2019) levee location and for a new location location proposed as part of a river restoration plan. The model archive includes information on: 1) stage-streamflow rating used for model calibration (calibration_targets); 2) the model run and output files (model_files); and 3) the 32-bit executable installation file for HEC-RAS 6.1 used to run the simulations (HEC-RAS_61.Setup.exe); 4) the modeling software version and website (model-software-version.txt); 5) the model bounding box coordinates (modelgeoref.txt); 6) an overview of how to run the model and all the files and folders in SWmodel_Archive.zip (README.txt).

This polygon shapefile represents model simulated flood-inundation extents for the Muddy River, near Moapa Nevada. A flood frequency analysis was performed at USGS streamgage 09416000 - Muddy River near Moapa, Nevada, to estimate the 50, 20, 10, 4, 2, and 1-percent annual exceedance probability (AEP) flood streamflows. The flood-inundation extents for the 50-, 20-, 10-, 4-, 2-, and 1-percent AEP floods were simulated for the current levee location in 2019 and for the new levee location of the proposed restoration. One model simulation represents the levee at its current (existing) location in 2019 on the east bank of the river and referred to as ‘current conditions (2019).’ A second model simulation removes the existing levee and represents the new levee location farther away from the river on the east side of the proposed restoration area. The second model simulation is referred to as the ‘proposed restoration conditions.’ Both model simulations had the same flood-hydrographs, hydraulic structures, and roughness coefficients; however, the topography data used for each model simulation was adjusted to represent differing locations of the existing and proposed levees. Flood-inundation extents were simulated with a coupled 1-D- and 2-D unsteady hydraulic model in the Hydrologic Engineering Center’s River Analysis System (HEC-RAS) computer program. Those locations where the water-surface was higher than the land surface were defined as inundated. The inundation polygons are named by AEP flow (50, 20, 10, 4, 2, 1-percent) and condition (current and proposed restoration).

This polygon shapefile represents model simulated flood-inundation extents for the Muddy River, near Moapa Nevada. A flood frequency analysis was performed at USGS streamgage 09416000 - Muddy River near Moapa, Nevada, to estimate the 50, 20, 10, 4, 2, and 1-percent annual exceedance probability (AEP) flood streamflows. The flood-inundation extents for the 50-, 20-, 10-, 4-, 2-, and 1-percent AEP floods were simulated for the current levee location in 2019 and for the new levee location of the proposed restoration. One model simulation represents the levee at its current (existing) location in 2019 on the east bank of the river and referred to as ‘current conditions (2019).’ A second model simulation removes the existing levee and represents the new levee location farther away from the river on the east side of the proposed restoration area. The second model simulation is referred to as the ‘proposed restoration conditions.’ Both model simulations had the same flood-hydrographs, hydraulic structures, and roughness coefficients; however, the topography data used for each model simulation was adjusted to represent differing locations of the existing and proposed levees. Flood-inundation extents were simulated with a coupled 1-D- and 2-D unsteady hydraulic model in the Hydrologic Engineering Center’s River Analysis System (HEC-RAS) computer program. Those locations where the water-surface was higher than the land surface were defined as inundated. The inundation polygons are named by AEP flow (50, 20, 10, 4, 2, 1-percent) and condition (current and proposed restoration).

This polygon shapefile represents the boundaries of the current (2019) and proposed levee locations used to simulate flood-inundation extents for the at Muddy River, near Moapa, Nevada. The new levee location is proposed as part of a river restoration plan for selected reaches of the Muddy River.

This U.S. Geological Survey data release consists of multiple datasets used to simulate the streamflow extents and hydraulic characteristics of Meadow Valley Wash at Stuart Ranch near Rox, Nevada. Streamflow extents equal the maximum area of flow inundation and were estimated using a two-dimensional (2D) hydraulic model. The modeled extents represent baseflow and six annual exceedance probabilities simulated for the current (2021) topography and modified topography associated with possible restoration of Stuart Ranch along Meadow Valley Wash. The data release includes: 1) a zip file containing a shapefile of a polygon dataset of the streamflow-inundation extents (Stuart_streamflow_extent.shp); 2) a zip file containing all raster datasets of streamflow depth (Stuart_Depth.zip); 3) a zip file containing all raster datasets of streamflow velocity (Stuart_Velocity.zip); 4) a zip file containing all relevant files to document and run the PeakFQ flood-frequency analysis used as input into the hydraulic model (09418700_Stuart_Flood_Frequency_Archive.zip); 5) a zip file containing all relevant files to document and run the 2D Hydrological Engineering Center-River Analysis System (HEC-RAS) hydraulic model used to generate a polygon dataset of streamflow-inundation extents (Stuart_SWmodel_Archive.zip); 6) a zip file containing a raster dataset of a digital elevation model (Stuart_DEM.tif) derived from survey points; 7) a zip file containing two polygon datasets of the restoration modifications used in conjunction with the Stuart_DEM to model possible restoration conditions (Beaver_Dam_Modification.shp and SideChannels_IrrigationDig_Modifications.shp); 8) a zip file containing a point dataset of survey points (SurveyData.shp) collected from December 14, 2020 to January 11, 2024, using real-time kinematic global navigation satellite system (GNSS), static GNSS, total station (TS), manual entries, and filtered ground observations from TLS surveys; and 9) a point dataset of lidar points (Stuart_Raw_TLS.las) collected at 44 scan locations by TLS surveys.

Flood-frequency analyses were conducted for three streamgages operated by the U.S. Geological Survey (USGS) in the Black River basin of southeastern Missouri (MO) and northeastern Arkansas (AR): 07064000, Black River near Corning, AR; 07068000, Current River at Doniphan, MO; and 07069000, Black River at Pocahontas, AR. Results from the analyses will be used for design purposes by the Arkansas Department of Transportation in the future Interstate 57 alignment from Walnut Ridge, AR to the MO state line. Annual peak-flow data through the 2023 water year (a water year is defined as the period October 1 - September 30, named for the year in which it ends) were downloaded from the USGS National Water Information System (NWIS) website at https://nwis.waterdata.usgs.gov/nwis/peak. Flood-frequency analyses using the Expected Moments Algorithm (EMA) were conducted in version 7.5.1 of USGS PeakFQ software (Veilleux and others, 2014; Flynn and others, 2006) following federal guidelines (England and others, 2019) and the techniques outlined in the most recent USGS flood-frequency report for Arkansas (Wagner and others, 2016). Peak-flow (.pkf), specification (.psf), output (.PRT) and export (.EXP) files from PeakFQ are provided, in addition to a plot of the frequency curve for each streamgage in .PNG format. Results from the flood-frequency analyses, including estimates of the magnitudes of floods corresponding to the 0.5, 0.2, 0.1, 0.04, 0.02, 0.01, 0.005, and 0.002 annual exceedance probabilities (AEPs; the equivalent of the 2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year recurrence intervals, respectively) and their associated variances and confidence intervals were retrieved from the .PRT file and are provided in .csv format.