Abstract
ABSTRACT IN order to predict the amount of sediment in subsur-face drain pipes, an analogy was established between the drain cross sectional area occupied by sediment and the amount of granular material that flowed in a confined volume through a perforation before a bridge formed. Experiments were performed using glass beads and eight different types of sand using a permeameter-like apparatus. Various parameters related to the shape and dimension of the perforations and to the particle size distribution of the sands were investigated. Results indicate that a sigmoid model describes more accurately than a linear model the relationships between the amount of material and the various factors related to the geometry of the perforation. For the eight sand types, the amount of material is best predicted (R2 = 0.828) from the hydraulic radius of the perforation and from the D60 of the sand.
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