Real winter rains to rid us of moles?

Winter, the real Cape winter of old, has certainly arrived in Cape Town at last. Cyclonic rain from the northwest was the norm; days of gentle rain soaking into the ground. Now it seems to be heavier rain, causing flash flooding and damage to property, as well as chaos on the roads. Of course the number  of incapable drivers on our roads has exploded and so there is generally chaos in dry conditions, but more accidents occur in the wet.
I've spent a few days this week trying to minimise the effects of what is forecast for the weekend - more rain in a day than we have had in years - and we have chopped back the huge trees whose branches beat against the house, cleared the gutters, cut down the bougainvillea whose beautiful cerise bracts adorned half the roof (we could never see them as it's a double storey, but they scattered on the ground like confetti when the wind blew) and disconnected the gutters from the JoJo tanks. The latter is because they are full and we have no use for all this water, believe it or not, despite the dire straits of just a few weeks ago. It can only be used to water the garden, which doesn't need it now, or flush the toilets, and that takes less than 50 litres a day. So what to do with 10 000 litres of rainwater? Let it run straight into the garden like it used to.
A molerat, and presumably its extended family, has destroyed the garden of late. Vast caverns have appeared in the lawn and under the paving, tree roots have become exposed and the lawn, which was starting to look a little respectable, doesn't bear looking at. In the old days, a thunderflash down the hole would have sent it scurrying to quieter climes, but nothing is putting this lot off. Except, maybe, the diversion of the flood that comes down from the road through the garden; this no longer turns it into a lake, as it now channels itself directly down the first molehole under the trees, washing away the bromeliads, and must be contributing substantially to raising the water table! If that doesn't get rid of the moles, nothing will. I'm hoping the coming rain will sort it out once and for all, then I can order a truckload of soil to fill in the sinkholes!