The frost line in Ohio is 3ft
The frost line depth for North Dakota is 4 feet normally to 6.5 feet extreme. 5 feet would be safe for posts.
Because the frost can settle around things and shift them about. Pipes, conduits and such that are buried beneath the frost line are much more likely to stay in place.
The recommended specifications for deck posts and footings to ensure structural stability and safety include using pressure-treated wood for posts, ensuring a minimum post size of 6x6 inches, setting footings below the frost line, and spacing posts no more than 8 feet apart. Additionally, footings should be at least 12 inches in diameter and extend below the frost line to prevent shifting.
Every geographical area in the wrld is different. Find out how deep the Frost line is for your area and bury the water line six inches to one foot below that.
frost line in Gwinnett
Bury to Holcombe Brook Line was created in 1882.
Bury to Holcombe Brook Line ended in 1963.
no Frost
Thetford to Bury St Edmunds line was created in 1876.
No
Not sure exactly but Franklin County is 32" some counties are 30" and in Portsmouth most fence posts and simple structures typically use 18"???