I am evaluating the baseflow estimates derived from a variety of hydrograph separation methods against groundwater level data for UK catchment areas, for my dissertation project.
I have obtained daily groundwater data for 8 sites in the UK corresponding to NRFA stream-gauging stations from the BGS:
https://www.bgs.ac.uk/research/groundwater/datainfo/levels/home.html
but I would also like to use some supplementary groundwater level readings to complement the existing time series and provide a more reliable storage representation of the underlying aquifers.
I have also had trouble downloading actual time series data from Geoindex and discouraged from using it further.
Does anyone know where I can obtain additional UK groundwater level data?