Over the weekend I noticed that the mole has extended its excavations into the flower border below the bird feeders. For the last few weeks that single molehill, right in the middle of the lawn, had been the only sign of its activity.
If I can infer the layout of its tunnels from the heaps of earth above ground, the main tunnel runs west northwest to east northeast. This is along the contour of the slope. Would a down-slope tunnel be at more risk of flooding?