Thesis - Open Access
Master of Science (MS)
The basic objective in the design of subsurface drainage systems is to determine the most economical placement of drain lines which will enable control of the water t able so that optimum crop growth is permitted. One way this goal can be achieved is to place drain lines at a depth and spacing that will not allow the water table to rise above a given elevation during the growing season . For example, the Bureau of Reclamation, in establishing design criteria for the proposed Oahe Unit irrigation project in central and northeastern South Dakota, stated that the water table should normally be more than three feet below the soil surface ( United States Department of the Interior, 1965). The Bureau estimated that drain lines placed nine feet deep and 790 feet apart would most economically meet the three foot design criteria for average Oahe Unit soil conditions. The installation of these drain lines requires the construction of open trenches, a method that has been used for centuries.
Library of Congress Subject Headings
Drainage -- Research
Number of Pages
South Dakota State University
Kienholz, James Mardred, "Evaluation of Bi-level Drainage Theory with a Viscous-flow Analog" (1973). Electronic Theses and Dissertations. 3895.