Abstract
Perforated draintubes have, in many places, supplanted the use of draintiles in drainage systems of agricultural lands, airports, structural foundations, etc. This indicates that there is a need to obtain analytical solutions of the drainage flow rate for perforated draintubes. By using a series solution of Laplace's equation and techniques of solution of dual trigonometric series, a formula for the flow rate into a draintube buried in a water-saturated soil medium is developed. The flow rate into a draintube depends on numerous characteristics such as the hole size, the number and spacing of holes, the drain size and depth. Graphs showing the variation in delivery ratio with respect to geometric characteristics of draintubes are presented.
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