Springs, clay and wet drainage fields
If your drainage field sits near the spring line, it may be fighting groundwater for half the year. East of Grayswood the Weald Clay comes to the surface, and fields there drain slowly in any season. In both cases the tank can fill and back up faster than you’d expect, especially in a wet winter. A field on the clay can need a much bigger area than one on sand.
Regular emptying keeps solids out of a field that’s already under pressure. Where a field has failed, we can advise on a replacement drainage field designed for the ground.
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