Category Variable Unit Description and method Data source
Area_km2 km² Catchment area
Topography dem.mean mamsl Mean elevation of catchment, from DEM rescaled from 25 to 100 m resolution using average EEA (2013)
dem.median mamsl Median elevation of catchment, from DEM rescaled from 25 to 100 m resolution using average EEA (2013)
slo.mean ° Mean topographic slope of catchment, from DEM EEA (2013)
slo.median ° Median topographic slope of catchment, from DEM EEA (2013)
twi.mean - Mean topographic wetness index (TWI, Beven & Kirkby, 1979) EEA (2013)
twi.med - Median topographic wetness index (TWI, Beven & Kirkby, 1979) EEA (2013)
twi.90p - 90th percentile of the TWI as a proxy for riparian wetlands (following Musolff et al., 2018) EEA (2013)
Land use f_artif - Fraction of artificial land cover (Class 1 Level 1 CORINE) CLC (2016)
f_agric - Fraction of agricultural land cover (Class 2 Level 1 CORINE) CLC (2016)
f_forest - Fraction of forested land cover (Class 3 Level 1 CORINE) CLC (2016)
f_wetl - Fraction of wetland cover (Class 4 Level 1 CORINE) CLC (2016)
f_water - Fraction of surface water cover ( Lass 5 Level 1 CORINE) CLC (2016)
pdens inhabitants km-² Mean population density CIESIN (2017)
Nutrient sources
N_T_YKM2
t N km-2 yr-1
Mean N input from point sources (from EU-DWE database)
Vigiak et al. (2019); Vigiak et al. (2020)
BOD_T_YKM2
t N km-2 yr-1
Mean biochemical oxygen demand input from point sources (from EU-DWE database)
Vigiak et al. (2019); Vigiak et al. (2020)
N_T_YEW
t N inh-1 y-1
Calculated N input per person (from EU-DWE database) N_T_YKM2 / nEW * Area_km2
Vigiak et al. (2019); Vigiak et al. (2020)
nEW - Calculated number of inhabitants, pdens * Area_km2 CIESIN (2017)
n_UWWTP - Number of point sources from European database (UWWTP database) EEA (2017)
Lithology and soils f_porous - Fraction of porous aquifer (code 1 and 2 of aquifer type) BGR & UNESCO (eds.) (2014)
f_fissured - Fraction of fissured aquifer (code 3 and 4 of aquifer type) BGR & UNESCO (eds.) (2014)
f_hard - Fraction of locally aquiferous and non-aquiferous aquifer (code 5 and 6 of aquifer type) BGR & UNESCO (eds.) (2014)
f_consol - Fraction of consolidated rocks (Lithology Level 5) BGR & UNESCO (eds.) (2014)
f_part_consol - Fraction of partly consolidated rocks (Lithology Level 5) BGR & UNESCO (eds.) (2014)
f_unconsol - Fraction of unconsolidated rocks (Lithology Level 5) BGR & UNESCO (eds.) (2014)
dtb.median cm Median depth to bedrock in the catchment Shangguan et al. (2017)
f_sand f_silt f_clay
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Mean fraction of sand in soil horizons of the top 100 cm Mean fraction of silt in soil horizons of the top 100 cm Mean fraction of clay in soil horizons of the top 100 cm
FAO/IIASA/ISRIC/ISSCAS/JRC (2012)
soilN.mean g kg-1 Mean top soil N in catchment Ballabio et al. (2019)
soilCN.mean - Mean top soil C/N ratio in catchment Ballabio et al. (2019)
Hydrology Q_mean m³ s-1 Mean discharge (period 1986-2015 used for all hydrologic variables) Musolff (2020); Musolff et al. (2020); HYDRO MEDDE (2019)
Q_median m³ s-1 Median discharge Musolff (2020); Musolff et al. (2020); HYDRO MEDDE (2019)
Q_spec mm Mean annual specific discharge Musolff (2020); Musolff et al. (2020); HYDRO MEDDE (2019)
Q_CVQ - Coefficient of variation of time series of daily Q Musolff (2020); Musolff et al. (2020); HYDRO MEDDE (2019)
Q_medSum m³ s-1 Median summer discharge (months May-October) Musolff (2020); Musolff et al. (2020); HYDRO MEDDE (2019)
Q_medWin m³ s-1 Median winter discharge (months November-April) Musolff (2020); Musolff et al. (2020); HYDRO MEDDE (2019)
Q_Sum2Win - Seasonality index of Q, as ratio between median summer and median winter Q Musolff (2020); Musolff et al. (2020); HYDRO MEDDE (2019)
BFI - Base flow index calculated according to WMO [2008] with lfstat package (version 0.9.4) in R Musolff (2020); Musolff et al. (2020); HYDRO MEDDE (2019)
flashi - Flashiness index of Q as the ratio between 5% percentile and 95% percentile of Q time series Musolff (2020); Musolff et al. (2020); HYDRO MEDDE (2019)
Climate P_mm mm Mean annual precipitation (period 1986-2015 used for all climatic variables) Cornes et al. (2018)
P_SIsw - Seasonality of precipitation as the ratio between mean summer (Jun-Aug) and winter (Dec-Feb) precipitation Cornes et al. (2018)
P_SI - Seasonality index of precipitation as the mean difference between monthly P averages and year average Cornes et al. (2018)
P_lambda - Mean precipitation frequency λ as used by Botter et al. (2013) Cornes et al. (2018)
P_alpha - Mean precipitation depth as used by Botter et al. (2013) Cornes et al. (2018)
PET_mm mm Mean potential evapotranspiration Cornes et al. (2018)
AI - Aridity index as AI=PET_mm/P_mm Cornes et al. (2018)
T_mean °C Mean annual temperature Cornes et al. (2018)