Annual mean water quality metrics for catchments draining to German drinking water reservoirs

This data describes water quality parameters and catchment characteristics for 88 catchments draining into German drinking water reservoirs.
This data was used in more detail in Musolff et al. (2017).
The data comprises:
Catchment - number of the catchment
Year - year for which the data was averaged
SUVA254 - Specific ultraviolet absorbance at a wavelenght of 254 nm of the filtered water sample [L m-1 mg-1]
NO3 - nitrate concentration of the filtered water sample [µmol L-1]
Fe - dissolved iron concentration [µmol L-1]
DOC - dissolved organic carbon concentration [mmol L-1]
PO4 - soluble reactive phosphorus concentrations of the filteres water sample [µmol L-1]
Forest - share of the catchment covered by forest following CLC (2016), static metric [%]
TWI90 - topographic wetness index following Beven and Kirkby (1979) using a 10 m digital elevation model, static metric [-]
The hydrochemical data was averaged using Box-Cox-transformation (Box and Cox, 1964) for the samples of each year, arithmetic mean and backtransformation. On average 11 samples per years have been averaged.
The data is stored as a CSV file.

References
Beven, K. J., & Kirkby, M. J. (1979). A physically based, variable contributing area model of basin hydrology. Hydrological Sciences Journal, 24(1), 43-69.
Box, G. E. P., & Cox, D. R. (1964). An Analysis of Transformations. Journal of the Royal Statistical Society Series B-Statistical Methodology, 26(2), 211-252.
CLC. (2016). CORINE Land Cover 2012 v18.5. . https://land.copernicus.eu/pan-european/corine-land-cover.