My Land Suggestion:

Deep ditches: Similar to a ditch. When empty cannot be crossed, and when full irrigates twice as much, and counts as 2 ditches for windpump fill limits and for land attraction value. Costs $25.

Windpump Limit: 10 ditches.

Advanced windpump: Costs $500. Can fill 25 ditches instead of 10.

Bridge: Built on ditches. Works like a path.