Loyal, post: 393531, member: 228 wrote: I have never worked in pancake land, so I tend to see the world from the perspective of high elevations, mountains, and the Basin and Range Province.
I think that the answer is that in most normal urban areas the error introduced in ignoring the orthometric height corrections between benchmarks 3.5 miles apart is on the order of about 2mm or less.
Kent McMillan, post: 393533, member: 3 wrote: I think that the answer is that in most normal urban areas the error introduced in ignoring the orthometric height corrections between benchmarks 3.5 miles apart is on the order of about 2mm or less.
You're probably right Kent.
But most ain't all, and not every surveyor has that easy-button sand box to play in.
Too many of the surveyors that I talk with around these parts, think they are in pancake land when it comes to such things, and that is NOT a good thing.
Loyal
Loyal, post: 393536, member: 228 wrote: You're probably right Kent.
But most ain't all, and not every surveyor has that easy-button sand box to play in.
Too many of the surveyors that I talk with around these parts, think they are in pancake land when it comes to such things, and that is NOT a good thing.
Loyal
It can be quite shocking how much the qeiod/gravity messes with elevations, even it the "flat" lands here......
I'm so used to it that it's usually the first thing I look at,,,,,,,,that and what's the fed land status around me.........
Jim Frame, post: 393101, member: 10 wrote: I was asked to provide a cost proposal to establish rim and invert elevations on 600 or so manholes distributed across a project 7 miles long and 3.5 miles wide for purposes of hydraulic modeling.
I'm all for hydraulic modeling if it'll keep my neighborhood from flooding after it rains! Yesterday, a main road on the west side of Orlando was flooding due to rain. I don't care how well the streets were designed, if the drainage structures aren't kept clear of debris they can't do their job. A 0.01' vertical tolerance for drainage structure inverts is ridiculous! Drainage structures are often filled with silt, and there can be concrete overpour. PIPE-MICs are good for cutting through silt, and for getting angled inverts. Many times I wished for a vacuum truck to accompany us to get rid of water. Thanks for the post!
