Planimeter

[acrow]

I drew my cross sections sort of free hand. I offset some lines for the grid and then traced some other lines for my contours. My scale is 3' and 30' in paper space. Is there any way I can calculate my cut or fill tracing my area in papper space then multiply them by 90 and is this going to be correct. My boss used his surveying program and his number are different than mine.

[ReMark]

What is this for, a borrow pit (as in where gravel is excavated)?

 

Planimeter. Jeez, I haven't used one of those in ages. Where I used to work the engineers would want me to make 3 to 5 passes then average the results. Something else I haven't used in a while is a pantograph. Anyone here remember that contraption? We had one that could span the length of a 3'x6' drafting table and a much smaller version.

Edited January 11, 2013 by ReMark

[acrow]

Thank you, but I still need the answear. We dont have planimeter here either. I draw the pline in the paper space, which gives me some area, then I multiply this by 90 (3'X30' scale) but my number is different then my boss and he doesn't know much. Those calculations are for the some lake to be or is excavated.

Thanks anyway.

[ReMark]

How many cross-sections do you have? What is the distance between each section?

[acrow]

The distance is 100 feet. I need to know how to calculate the sf area of just fill or cut.

[eldon]

I would have thought that the only way to get an accurate area of a cross section would be to have the section drawn out full size.

 

Then volumes can be calculated with the aid of Simpson's rule, for example.