In the alluvial ground of the river Fulda valley and in the diluvial terrace of the river Weser assortments of tubes of various lengths were sunk into sandy and gravely underground to bring to light groundwater of different depths. The installation of these groundwater pump stations was effectuated by two different methods: 1. with the aid of an apparatus for bringing down bore-holes, 2. by ramming in the pump tubes with the aid of a pneumatic hammer. The first biological and chemical investigations in these subterranean water research stations indicated that the vertical distribution of groundwater organisms and chemical substances in special cases may depend on the nature of subterranean water currents and the infiltration of polluted water into the sandy and gravelly underground of valleys and terraces.
Versuche zur Erfassung der vertikalen Verteilung von Organismen und chemischen Substanzen im Grundwasser von Talauen und Terrassen; Methoden und erste Befunde.
International Journal of Speleology,
Available at: https://scholarcommons.usf.edu/ijs/vol6/iss4/1