Please note that this is an old document that has been scanned so the quality is not as good as in documents created as pdfs Describes German work on electrical drainage in fine-grained, waterlogged soil. Case studies include a railway cut near Salzgitter and the U-boat pens at Trondhjem. 28 pages. N.B. The contrast in the photographs is poor (enlarging them may help slightly) but it is poor in the original document.