Abstract
Numerous types of permeable material are used over field drainage pipes, principally as a hydraulic connection between mole drainage channels and the pipe itself. To date such materials have simply been required to be clean and within a certain size range. Data are presented here which cover mechanical strength, size and fines content while the possible complications of toxicity and solubility are also briefly discussed. It is demonstrated that a more detailed, performance based, specification may now be written which covers the majority of materials encountered.
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