Show roman dikes dike the dikes which protect the netherlands from the north sea in many cases go back to roman times many tire 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 by stone slopes and by plies piles and at t the more dangerous points by artificial structures of brushwood laden with stones the west kapelle dike Is feet long and has a seaward slope of feet on a ridge sit feet wide are a roadway and a railway |