National Engineering Handbook: Chapter 45 - Filter Diaphragms
From ASDSO Dam Safety Toolbox
Natural Resources Conservation Service, 2007
The purpose of this document is to discuss design and uses of filter diaphragms. A filter diaphragm is a designed zone of filter material (usually well-graded, clean sand) con-structed around a conduit. It is a standard defensive design measure to prevent problems associated with seepage or internal erosion in earthfill surrounding a conduit.
A filter diaphragm is designed to intercept water that can flow through cracks that may occur in compacted fill surrounding conduits or water that may flow along the interface between the conduit and the surrounding fill.
Revision ID: 5888
Revision Date: 12/16/2022