Just having a driveway installed and the tradesman pointed out a concern to me in regards to top of the drive. We converted the front part of our garage a couple of years back and a drainage channel was installed by the new brickwork. As the channel now finishes a bit short to where the edge of the new drive will be he noticed that there is a void underneath the channel and also a hole has been made directly underneath where the down pipe is, so water from the guttering fall into this void too. His concern is the amount of water that will go into here and also it being right next to the foundations. The work was also signed off by building regs, so should I have concerns. Tia