Shape of the water table in tile drained land

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In 1915, while investigating drainage conditions at Kearney Park, California, the author was attracted by what appeared to be a discrepancy between the shape of the water table profile between lines of tile as found in the field and those usually shown in textbooks and other published papers on drainage. At the time, the shape of this profile was attributed to the heavy flooding which was being done on the drained tract.

A year or two later similar characteristics were observed on tile drained tidal marsh lands in Marin County, and this was attributed to the very heavy-textured soil of this area. It is now believed, however, that these observed shapes were not due to unusual or particular conditions, but that they represent the normal conditions of the water table on drained land.