This weekend's torrential downpour made us aware of a significant drainage problem with our property: water draining down from the back garden seems to be overflowing the drain next to the back wall, going through the ventilation gaps and thence under the house. On sunday morning we saw the traces of a flood of water through the garage caused by what must have been a considerable amount of water. Looking in the underfloor area, we were a little alarmed to find the water flow has already started to carve through the limestone bedrock (grand canyon in miniature). Presumably this has been going on for some time, judging by the fact the drain was completely blocked up when we first moved in.
It looks like we'll need to beef up the drainage in the back garden, and, as a side effect improve the aeration in the underfloor area.
A related issue: I'm curious to know where our gutters actually drain to. It seems unlikely that soak wells would work well here, given the clay-like nature of the soil. Could they drain into the street drain?
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