related question: if my drive crosses a slope, the drive will cause a dam. using your above gravel/rock suggestions, how many/how large diameter of drain pipe would place at the base to move water? i have about 200 feet of driveway to create, and think i'll need to have it cut into the grade but am worried about rain/melting snow damming up.
As long as it's not a continuous stream a 12 inch pipe should be adequate.