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Show Roman Dikes The dikes which protect the Nether lands from the North sea in many cases go back to Roman times. Many are raised as much as 40 feet above high-water mark and are wide enough at the top for a general roadway or canal. They are made of earth protected pro-tected by stone slopes and by piles and at the more dangerous points by artificial structures of brushwood, laden with stones. The West Kapelle dike is 12,403 feet long and has a seaward sea-ward slope of 300 feet- On a ridge 39 feet wide are a roadway and a railway. |