Title: Reservoir regulated catchments in the European Alpine region

Contact: Jonas Götte, jonas.goette@slf.ch

Description: This dataset contains streamflow data for reservoir-regulated catchments in the European Alpine region. The dataset is split into two parts, suitable for two different analysis: a) "Pre_Post", representing streamflow records at the same location before and after the construction of reservoirs and b) "Up_Down", representing streamflow records at gauging stations up- and downstream of reservoirs. The streamflow records are of individual length for each station and are within a timeframe of 1 Oct 1899 to 30 Sep 2020. "Matched_Natural.zip" contains additional streamflow time series from non-reservoir-regulated catchments which are close to regulated catchments, as shown in 'CatchmentMatches.csv'. These time series can be used to estimate natural changes over time. The dataset accompanies the paper "How do reservoirs influence streamflow extremes? Insights from a large-sample analysis in the Alpine Region" by Götte et al. (DOI 10.1088/3033-4942/ae0151).

Structure of the meta file "Pre_Post_Qmeta.csv":
	- "ID": ID of gauge. It consists of an abbreveation for each country/sub region and the original ID as used by the data provider. If no data provider ID was available, the IDs were generated by enumerating the gauges
	- "Country": Country where the gauge is located
	- "River": Name of river the gauge is located on
	- "Area": Catchment area [km2]
	- "ElevMean": Mean catchment elevation [m]
	- "ElevMedian": Median catchment elevation [m]
	- "ElevMin": Minimum catchment elevation [m]
	- "ElevMax": Maximum catchment elevation [m]
	- "X_Coordinate": Gauging station x-coordinate (EPSG: 4326, WGS 84)
	- "Y_Coordinate": Gauging station y-coordinate (EPSG: 4326, WGS 84)
	- "Res_Number": Count of reservoirs in the catchment
	- "Res_Capacity": Accumulated reservoir capacity in the catchment [Mio m3]
	- "Res_Capacity_NA": Count of reservoirs in the catchment with unknown volume
	- "Res_MinDate": Date of first reservoir construction or operation, format: YYYY-MM-DD
	- "Res_MaxDate": Date of last reservoir construction or operation, format: YYYY-MM-DD
	- "Q_MinDate": Start date of used discharge timeseries, format: YYYY-MM-DD
	- "Q_MaxDate": End date of used discharge timeseries, format: YYYY-MM-DD
	- "Q_preMean": Mean discharge before reservoir construction [m3/s]
	- "Q_postMean": Mean discharge after reservoir construction [m3/s]
	- "Res_Capacity_rel": Relative reservoir capacity: Res_capacity / Annual Q_pre
	
Structure of each streamflow record file in "Pre_Post_Q.zip" and "Matched_Natural.zip":	
	- "Date": Date of recorded flow, format: YYYY-MM-DD
	- "Discharge": Mean daily flow [m3/s]
	- "Year": Calendar Year
	- "HydYear": Hydrological year

Structure of the file showing matched catchments "Catchment_Matches.csv":
	- "Reg_ID": ID of regulated gauge
	- "Reg_MinDate": Start date of reservoir-regulated discharge timeseries, format: YYYY-MM-DD
	- "Reg_MaxDate": End date of reservoir-regulated timeseries, format: YYYY-MM-DD
	- "Res_MinDate": Date of first reservoir construction or operation in the reservoir-regulated catchment, format: YYYY-MM-DD
	- "Res_MaxDate": Date of last reservoir construction or operation in the reservoir-regulated catchment, format: YYYY-MM-DD	
	- "Nat_ID": ID of matched gauge for a natural catchment
	- "Nat_MinDate": Start date of the natural discharge timeseries, format: YYYY-MM-DD
	- "Nat_MaxDate": End date of the natural discharge timeseries, format: YYYY-MM-DD
	
Structure of the meta file "Up_Down_Meta.csv":
		- "Up_station": Upstream gauge name
		- "Up_X_coord": Upstream gauging station x-coordinate (EPSG: 4326, WGS 84)
		- "Up_Y_coord": Upstream gauging station y-coordinate (EPSG: 4326, WGS 84)
		- "Down_station": Downstream gauge name
		- "Down_X_coord": Downstream gauging station x-coordinate (EPSG: 4326, WGS 84)
		- "Down_Y_coord": Downstream gauging station y-coordinate (EPSG: 4326, WGS 84)
		- "Res_X_coord": Reservoir x-coordinate (EPSG: 4326, WGS 84)
		- "Res_Y_coord": Reservoir y-coordinate (EPSG: 4326, WGS 84)
		- "River": Name of the river on which reservoir and gauges are located
		- "Q_MinDate": Start date of used discharge timeseries
		- "Q_MaxDate": Start date of used discharge timeseries
		
Structure of each streamflow record file in "up_down_Q.zip":
		- "Date": Date of recorded flow, format: YYYY-MM-DD
		- "Discharge_upstream": Mean daily flow, upstream [m3/s]
		- "Discharge_downstream": Mean daily flow, downstream [m3/s]

All streamflow records in "up_down_Q.zip" are trimmed to only include the period after reservoir construction.

The raw streamflow data was sourced from:
Switzerland (Federal Office for the Environment, FOEN)
Austria (Austrian Ministry of Sustainability and Tourism)
France (Banque HYDRO)
Regional agencies:
Bavaria (Bayerisches Landesamt für Umwelt)
Baden-Württemberg (Landesanstalt für Umwelt Baden-Württemberg)