I've been using site levels and lasers for years now. I'm fairly well versed with them. However, I am currently working on a project that has me stumped.
I have 4 catch basins with 24" storm drain in a line. I am trying to find the elevation of each catch basin.
My benchmark is set at 157.91. If I set the benchmark on my laser rod and it's set at 3.25(for example), if my 1st basin shoots a 4.50 on my rod, I calculate the difference of 1.25. I then subtract 1.25 from 157.91 and get the elevation of 156.66 for my 1st basin. My question is, if my 2nd basin shoots a 5.50 on my rod, do I subtract the difference between 4.50 - 5.50(1.0)from my original benchmark, or do I subtract it from my 1st box elevation of 156.66?
I really hope this makes sense as it's kind of hard to explain.
Anybody? Thanks a bunch in advance.
I have 4 catch basins with 24" storm drain in a line. I am trying to find the elevation of each catch basin.
My benchmark is set at 157.91. If I set the benchmark on my laser rod and it's set at 3.25(for example), if my 1st basin shoots a 4.50 on my rod, I calculate the difference of 1.25. I then subtract 1.25 from 157.91 and get the elevation of 156.66 for my 1st basin. My question is, if my 2nd basin shoots a 5.50 on my rod, do I subtract the difference between 4.50 - 5.50(1.0)from my original benchmark, or do I subtract it from my 1st box elevation of 156.66?
I really hope this makes sense as it's kind of hard to explain.
Anybody? Thanks a bunch in advance.
Elevation Calculations
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