Abstract
A form of gravel mole drainage, in which clean gravel aggregate of 10–20 mm, viz. passing 20 mm and retained on 10 mm square mesh, is filled into a mole channel, was developed as a solution to the problem of failure of mole drains because of unstable channels. The development and testing programme for the system is described. The results of field trials show that gravel mole drains perform equally well as conventional mole drains where the latter are stable and they continued to perform well in soils where mole drainage failed because the mole channel became filled with soil. The oldest drains are still working after 17 years and the system is in commercial use.
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