See exactly where the water goes, dated evidence for planning, permits and disputes.
Runoff, pooling and erosion documentation from the air.
Pick a package, add extras if you want them, check out. Everything is one-time unless it's marked /mo or /yr.
A surface model showing exactly where water goes, the low spots, the paths, the places it pools.
Problem zones marked on the aerial so the drainage issue is obvious to anyone looking, not just an engineer.
Dated evidence of erosion and washout, the record you need for planning, permits or a dispute.
No, draw the problem area on the map and the estimate prices itself. Rough acreage works too if you'd rather type it.