Keyword "CONDUIT" in:

Self-organized system of underground conduits originated by groundwater flow along fractures in quartz sandstone in Střeleč quarry
Soukup,J., Bruthans,J., Světlík,D., Schweigstillová,J., Smutek,D., volume 46, 2013 (GRR for 2012), pages 296–304
pdf (0.94 MB)

Self-organized flow and porosity in Bohemian Cretaceous Basin: Results of tracer tests and other methods
Bruthans,J., Mikuš,P., Soukup,J., Světlík,D., Kamas,J., Zeman,O., volume 44, 2011 (GRR for 2010), pages 233–238
pdf (0.36 MB)