The Collin County terrain description identifies generally level to gently rolling land. A level-looking entrance can still have a grade change across the gate’s travel. We measure that path, not only the opening between posts. A swing gate needs clearance throughout its arc; a sliding gate needs a clear route beside the opening. Fence runs also need a deliberate choice between following the grade and stepping panels.
The county identifies deep clayey soils over marl and chalk in its central and western areas. That regional description makes checking the actual subgrade necessary before planning posts or concrete. Where expansive black clay is present, moisture changes can move shallow supports and disturb gate alignment. We apply the one-third depth rule to concrete footings and assess drainage around the supports. For driveways and gate pads, we check how the proposed surface meets the existing grade so runoff and vehicle transitions are addressed together.



