We here present a spatial set of natural-regulated catchment pairs to study the effect of reservoir regulation on local and regional flood and drought characteristics in the United States.
This data set is composed of the following components:
1) List of catchment pairs (paired_catch_list.txt) containing the USGS IDS of the 114 paired natural ('nat_id') and regulated ('reg_id') gauge.
2) Folder with shapefiles of gauge locations and catchment boundaries of natural and regulated catchments (folder shapefiles).
3) Folder with streamflow time series corresponding to the natural and regulated gauges
4) Folder with extracted mean drought and flood characteristics for the natural and regulated gauges

The different datasets can be linked using the USGS IDs, which are provided for each of the components.

shapefiles:
- natural_catchments_points.shp: gauge locations of natural catchments. Variables: STAID = USGS ID, STANAME = station name, CLASS = catchment class according to Dudley 2018 dataset, AGGECOREGI: region, DRAIN_SQKM: drainage area in km2, HUC02: HUC 2 membership, LAT_GAGE: latitude, LNG_GAGE: lonitute, STATE: US State, HCDN_2009: indicates whether or not station is classified as a HCDN 2009 station, ACTIVE09: indicates whether station was active in 2009, FLYRS1900: available years since 1900, FLYRS1950: flow years since 1950, FLYRS1990: flow years since 1990.
- natural_catchments_shapes.shp: catchment boundaries of natural catchments. Variables: AREA: catchment area m2, GAGE_ID: USGS ID
- regulated_catchments_points.shp: gauge location of regulated catchments. Same variables as for natural catchments plus STORAGE: storage capacity of all reservoirs in total storage per km$^2$ (1 ML = 1,000,000 L = 1,000 cubic meters)
- regulated_catchments_shapes.shp: catchment boundaries of regulated catchments. Same variables as for natural catchments

streamflow_data:
- one time series per catchment: _daily_discharge.txt. Variables: acency_cd: USGS, site_no: USGS ID, Date: YYYY-MM-DD, Flow: ft3/s

extremes:
- mean_drought_char.txt: Variables: USGS_ID_nat = USGS ID of natural gauge, USGS_ID_reg: USGS ID of regulated gauge, number_events_nat: mean number of events in natural catchment, number_events_reg: mean number of events in regulated catchment, timing_nat/reg: mean time of year o drought occurrence, duration_nat/reg: mean drought duration (days), deficit_nat/reg: mean specific drought deficit (deficit volume over whole drought duration normalized by catchment area; m^3), intensity_nat/reg: specific drought intensity (absolute value of discharge-threshold at the time of minimum flow normalized by catchment area; mm/d)
- mean_flood_char.txt: Variables: USGS_ID_nat = USGS ID of natural gauge, USGS_ID_reg: USGS ID of regulated gauge, number_events_nat: mean number of events in natural catchment, number_events_reg: mean number of events in regulated catchment, timing_nat/reg: mean time of year o flood occurrence, duration_nat/reg: mean flood duration (days), volume_nat/reg: mean specific flood volume (volume over whole flood duration normalized by catchment area; m^3), peak_nat/reg: mean specific flood peak (peak flow normalized by catchment area; mm/d)

References:
Dudley et al. 2018:Dudley, R., Archfield, S., Hodgkins, G., Renard, B., & Ryberg, K.(2018).Peak-streamflow trends and change-points and basin characteristics for 2,683 U.S.Geological Survey streamgages in the conterminous U.S.Retrieved fromhttps://www.sciencebase.gov/catalog/item/5b183960e4b092d965219d62doi:  10.5066/P9AEGXY0.
Brunner (2021): Reservoir regulation impacts droughts and floods at local and regional scales