Chicago : Engineering and Contracting Pub. Co. · leaf 153
e. of ponds and their elevations. This kind ofan investigation is truly superficial, but never-theless when coupled with a working knowl-edge of tile drain designing for various con-ditions and with the information gained fromthe tile line surveys, will enable the engineer volves upon engineers to… … Fig. 9—Junction of Pipe Line and Open Ditch. better to design the grade lines and point outbeneficial corrections in the methods adoptedby the owner. Since this typical owner con-siders a plat and profile of the survey anunnecessary expense, but must possess somerecord of the survey for the…
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