Go to the head of the responsible lower water authority and ask him for a sensible solution. Here, the very friendly municipal employees knew the conditions and we investigated in advance what would be approvable. We live mostly on rock, so little seeps away. In the end, we built a soakaway of agreed dimensions under the first part of the driveway, where there was the least rock and the lowest part of the property. The pipes to it were long and we needed 2 additional shafts. Talking helps a lot after all. You can clarify such things well on site.