Soil particle migration through slots in drains - I, unidirectional flows

B. Tahar, T. H. Hanna

Research output: Contribution to journalJournal articlepeer-review


The silting of drains is a well known phenomenon. Attempts are made to prevent soil particle migration by the use of a filter surround. A special apparatus is used to simulate, in a realistic manner, the flow in the vicinity of a slot which is believed to be representative of an opening or crack in a drain. The soil loss through the slot was recorded as a function of time, for several values of applied water head and slot width. Three sand filters - fine-to-medium, fine-to-coarse and gap-graded were used. The critical slot width can be related to the D85 size and values of slot width/D85 size ratio are in the range 2 to 4, much less than currently used values. For gap-graded soil the same limits apply provided that the coarser material does not allow the finer fractions to migrate.

Original languageEnglish
Pages (from-to)33-50
Number of pages18
JournalGeotechnical Engineering
Issue number1
StatePublished - Jun 1995
Externally publishedYes


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