Back in the old days I used to do a lot of accident surveys involving crown & paving issues. I always used my robot, but generally provided them not only the coordinate file, but a 0.10' contour map of the project. Not sure if the lawyers even knew what they were looking at, so make sure you remain on the "expert witness" side of the case..$$$$
I'd be careful about going below that precision. Kind of because it involves a real level, then a horizontal position. Nobody ever wants to pay for that anymore, even lawyers.
0.25', no problem. Just charge more and do it right the first time.
Good luck and go cash the check....;-)
I've Done 0.2' Contours For intersections And Cul-de-sacs
Overkill, but the reviewing engineer had a mind that was unable to imagine what happened in between the normal contours.
Paul in PA
Don't forget to create a breakline along the top and bottom edge of all potholes and take several shots in the bottom of each.
A few years ago, I had a job where we had to topo the asphalt in front of the hangars at the small local airport. There was water ponding. They wanted 1/2-foot contours. If I remember right, we were on a 10' grid.
Old Days?
Back in the old days I used to do a lot of accident surveys involving crown & paving issues. I always used my robot"
Try to imagine my creaky old voice here saying:
"Sonny boy, if you were using a robot, those weren't the old days!"
🙂
Don
AND GOPHER HOLES- ( QUE UP KENNY LOGGINS!)
DITDITDITDITDITDIT-I'M AL-RIGHT!
Old Days! ! ! !
Eastern Ohio coal fields 1978 narrow (9 ft lanes) state highway. Tractor-trailer hauling coal stopped and weighted with portable scale. Trucking company called my boss while weighting was in progress. Boss marked edge of pavement at scales, measured length of truck and axle spacing. Other trucks hauling through weighing and all survey work.
Got crew out within a few hours. Conventional levels and cross section road at 25 foot intervals for over twice the length of the truck both sides of scale location. Site was not level enough for use of portable scale. Cost of survey saved overload fine.
No problem for hard surfaces. Rough graded dirt ?? No.
