Geotextile filters are rapidly replacing graded granular filters as the standard of practice in geotechnical design. However, as with graded. granular filters, their perfonnance cannot be assured without proper design. This paper presents the application and design of geotextile filters used in drainage and erosion control systems. Design is presented in generic form such that national standards and local conditions can be considered in evaluating the properties required for the geoteA1ile. A step-by-step design approach is included.
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