Experimental and analytical modelling of filtration in granular media

B. Indraratna, F. Vafai, A. Haque

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther


This study looks at both experimental and analytical modelling of filtration with regard to cohesionless (granular) filters. Initially, the paper discusses the experimental aspects of sand filters in the retention of a range of particle sizes of a lateritic base soil, and identifies a distinct demarcation between effective and ineffective filters. The effluent flow rate, filter permeability and specific particle sizes of base soil are considered to describe the filtration phenomenon. The mathematical model is developed on the basis of mass and momentum conservation principles applied to base soil particles eroding under a critical hydraulic gradient. The model is capable of predicting the amount of material eroded or retained within the base soil filter system at a given time. The filtration process is described by the time-dependent changes in particle size distribution curves, effluent flow rate, filter porosity and permeability.

Original languageEnglish
Title of host publicationGeotechnical Special Publication
Number of pages18
Publication statusPublished - 1998
Externally publishedYes
EventGeo congress of the Geo-Institute of ASCE 1998 - Boston, United States of America
Duration: 18 Oct 199821 Oct 1998

Publication series

NameGeotechnical Special Publication
PublisherAmerican Society of Civil Engineers
ISSN (Print)0895-0563


ConferenceGeo congress of the Geo-Institute of ASCE 1998
Country/TerritoryUnited States of America
Internet address

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