Most common issue here is those rural 1 acre blocks on a road corner sold/ give to a church back in early 1900's and as mentioned side road not at 90° so the 'acre' is anything up to that size.
Common to convey 1 acre, 4 chain by 2.5 chain and show a plan with 90° corners.
Occasionally the lot is laid out square sided but 2.5 X 4 chains rather than 4 X 2.5.
Thankfully as these deeds generally emanate from solicitors and church wardens probably drawing all together on kitchen table the Titles Office allow normal discretion and assumptions.
So a resurvey of same is easy where they don't subscribe to deed descriptions and fences don't fit or are just for convenience.
As to 1 acre that 'we all know what that is' that rarely surfaces for me, though occasionally you get experts that know everything about boundaries but that goes way beyond simple areas.
I get clients that know that there is a difference between a 210' acre and a 208.71' acre. It is commonly called a "big acre" and I get told whether I'm supposed to survey a "big acre" or a "little acre". It has always been a joke that I would change my business name to "Big Acre Surveying" (hence the login name) and have a tv commercial like personal injury lawyers where there would be a client holding a copy of the survey while a survey crew was working the background. The client would say "I called Mr. Byrd and he got me the Big Acre I deserved".
:gammon:
