A channel just under the surface running across a driveway and covered with a grille or grate is not unheard of. It may be used to get water across where just a few inches below grade are needed for gravity flow.
Such a channel is also used to collect rainwater running down the driveway and divert the water to a dry well rather than out into the street or down into the property.
The disadvantages of crab apple trees. In summer, the apples are too sour to pick and eat. In winter the birds come and leave dropping all over the place.