Graduate Thesis Or Dissertation
 

A study of simulated water table fluctuations in a tile drained Amity soil

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  • A lack of reliable criteria for designing tile drainage systems in the Willamette Valley has lead to tile drainage installations in a given soil series being based on general observations of previous drain performance in the series. Relatively few quantitative measurements, which would aid in designing economical installations, have been made on existing tile systems in the Valley. An experimental tile installation with tile spacings of 30, 60, and 90 feet was made in what was considered to be a modal soil of the Amity Soil Series. Records of rainfall, tile flow, water table position, and water table profiles were obtained during the winter and spring for three years. Mathematical models programmed for a digital computer were constructed from the field data to simulate water table movement for combinations of 90, 120, and 150 foot tile spacings; unrestricted, 1.0, and 0. 5 inch per day main line capacities; surface storage; and a grassed or bare soil surface. Rainfall in the Willamette Valley is quite variable in amount and distribution from year to year, hence 16 years of hourly rainfall and monthly evaporation were used with the simulator programs to generate 16 years of monthly summaries of water table depths for March, April, and May. The data from the simulator programs were then analyzed to obtain estimates of probable water table depths for the several drainage installations simulated. Estimates were also obtained for the effects of surface cover, surface storage, restricting main line capacity, and changing tile spacing.
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