Sandy ridge, wet brooks
The brooks below Pulborough are wet grassland that is often under water through the winter, and the RSPB reserve at Wiggonholt is managed with that in mind. Homes on lower ground near the Arun and Rother can find their drainage field sitting in saturated soil for weeks at a time.
When that happens the tank can’t release its liquid into the ground, and the level rises. Emptying it gives you breathing space while the water drops. If it happens every year, a septic tank survey will show whether the system needs changing.
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