Abstract
ABSTRACT OVER 1,900 tile drainage discharge events were analyzed to evaluate the drainage coefficient of a Brookston clay loam soil. Only 71% of the discharge events had a duration of 24 h or greater. Of these 71%, 32% occurred in March, April and May, 12% occurred from June through October, and 56% occurred from November through February. Average 24-h discharge depths varied during the year but were highest in August to September due to rainfall occurring on cracked soil. A drainage coefficient can be associated with each season. The probability of an annual drainage coefficient of 11.5 mm/day is 50%. If a longer period of time is chosen for a drainage event, the required flow capacity of the collector drain is reduced and the cost may be decreased.
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