The following data were collected as part of the NOAA National Severe Storms Laboratory's (NSSL) Severe Hazards Analysis and Verification experiment (SHAVE) in the summers of 2008 and 2009. Undergraduate meteorology students used geographic information along with a telephone database to poll the public likely to be affected by severe weather about their experiences. Their responses are included in the following dataset. More information about the SHAVE experiment can be found at: http://www.nssl.noaa.gov/projects/shave/ When referencing the SHAVE project, please refer to: Ortega, K.L, T. M. Smith, K. L. Manross, K. A. Scharfenberg, A. Witt, A. G. Kolodziej and J. J. Gourley, 2009: The Severe Hazards Analysis and Verification Experiment. Bull. Amer. Meteor. Soc., 90, 1519-1530. When referencing SHAVE flooding reports, please refer to: Gourley, J. J., J. M. Erlingis, T. M. Smith, K. L. Ortega, and Y. Hong, 2010: Remote collection and analysis of witness reports on flash floods. J. Hydrol., 394, 53-62, doi:10.1016/j.jhydrol.2010.05. ***** [UPDATE 2011]: Flash flood impact classification was added to SHAVE reports, as well as spatial attributes (land use, pop. density local upslope, drainage area and wetness index). Impact classification is based on comments and previous 'report type', 'evacuation', 'rescue' fields, now replaced by 'impact' fields. For each reports, the three most severe recorded impacts are registered in fields 'impact1, 2 and 3'. A clean up was also made by deleting redundant fields, or fields for internal use. - Calianno Martin, 2011 - When referencing Martin's work, please refer to: Calianno, M., I. Ruin, and J. J. Gourley, 2012: Supplementing flash flood reports with impact classifications, J. Hydrol., (in press). ***** This file consists of comma-separated columns of the following fields: Id_tag Denotes the call time and caller (for internal use) [In 2010, this field was changed to serve as a unique report identifier containing a number denoting when each report was taken in chronological order] Start_UTC Event start date and time in UTC Start_UNIX Event start time in Unix time End_UTC Event end date and time in UTC End_UNIX Event end time in Unix time Start_lat Latitude of report Start_lon Longitude of report Impact1 Most severe recorded impact. Impact categories are classified from the least to the most severe into the following categories : 1 = no impact (SHAVE 'null report') 2 = other (unclassified or unknown impact) 3 = overflow (streams out of their banks) 4 = greenlands flooding (inlcudes : cropland, pastures, yards, grassland) 5 = street/road flooding 6 = road closure (or impassible) 7 = inundation (floodwaters in buildings/homes, including basements) 8 = Evacuation 9 = Stranded cars (e.g.: moved by floodwaters, stalled in ditches, ...) 10 = Rescue, Fatality or Injury Impact2 Second most severe recorded impact Impact3 Third most severe recorded impact Metr_comments Additional comments about the call (pertaining to meteorological events) Report_type 2 = severe 1 = non-severe 0 = null The following criteria were used for determining a severe flood: 0.5 ft (0.15 m) of moving water, 3.0 ft (0.91 m) of standing water, road/bridge closures, washed out roads/bridges, rescues/evacuations, water in an above-ground structure, or major creeks/rivers out of banks Flood_ongoing Denotes if the flooding was still occurring at the time of the call Flood_move Denotes if the floodwater was moving or standing. [For 2008, reports where this could not be determined or where flooding did not occur are marked "unknown". For 2009 and 2010, reports where this could not be determined are marked "unknown" while reports where no flooding occurred are marked "null".] Flood_water_depth_m Depth of the floodwater (in meters) [For 2010, depth and extent were recorded in the same field, so values over 3 meters are assumed to be extent and those under 0.5 meters depth. Between these two cutoff points, comments have been used to determine which category is appropriate. Where possible, comments have also been used to assign depth and extent to the same reports.] Flood_lateral_extent_m Lateral extent of pond/creek/stream overflow (in meters) [See above for further notes about 2010 reports.] Flood_evac Location of the evacuation(s) [Not recorded in 2009.] Contact_re 'Contact Result' : Marks the call as "questionable" if the resident could not provide an exact time or location of the event or if the data given were suspect. Flood_freq How often the type of flooding experienced occurs : 0 = no response 1 = every time it rains 2 = only during heavy rain 3 = once per year 4 = once every 5 years 5 = once every 10 years 6 = never had seen it before [For 2009, this was not recorded and all reports contain "0" in this field. For 2010, this was recorded for only part of the SHAVE experiment. All other reports will contain a blank in this field.] LAND_USE_C Land Use (code) 0 Water (and Goode's interrupted space) 1 Evergreen Needleleaf Forest 2 Evergreen Broadleaf Forest 3 Deciduous Needleleaf Forest 4 Deciduous Broadleaf Forest 5 Mixed Forest 6 Woodland 7 Wooded Grassland 8 Closed Shrubland 9 Open Shrubland 10 Grassland 11 Cropland 12 Bare Ground 13 Urban and Built-up LAND_USE Land Use (text) POPULATION Population density (inhabitant/km2) SLOPE Local upslope (¡) FLOW_ACCU Flow accumulation, i.e. the drainage area (km2) CTI Coumpound Topographic Index, also called 'Wetness Index' SLOPE, FLOW ACCU and CTI are sampled from the USGS North America Hydro1k raster products (gridcell size : 1km2).