If the Existing Ground is DEEPER than the Finished Ground ... it is needed to FILL (NOT CUT) to achieve that level of Finished Ground -- referring to timestamp 1:21 to 1:31.
In real world examples, it becomes a little more tricky when you have an Asphalt road running through three quarters of the grid and you have a building foundation running through one quarter of the grid. Then you have to account for their individual thicknesses avg it (3 x road thickness + 1 x building fdn thickness)/4 to get the average bottom elevation. Of course there are earthwork takeoff software like Roctek Winex etc. to automate all these calculations and get a very accurate cut/fill takeoff.
I agree! In our academic setting, we definitely are trying to get them to see that there are many factors to consider. Their first project was actually to review various take-off software, but our department's philosophy is that if you don't know how to do a process manually, you will be relying on a device instead of your knowledge. Please keep watching and commenting! I love it :-)
HI, Very nice example ... it was a good refresher on manual earthwork takeoff calculations for me ... just some minor corrections if I may point out please... one the 4th point 159-157.5 is 1.5 (instead of 2.5) and so the average is (.6+.3+1+1.5)/4 = 0.85 ft Fill Height. Vol = 30 ft x 30 ft x 0.85 ft = 765 c.ft. And I guess here's the important part.... since this fill is compacted and we have a soil shrinkage of 12% we need more soil i.e., 765 x 1.12 = 857 c.ft. / 27 cft per yd = 32 cyd. And 1 truck being 13 cyd. We need 32/13 = 2.46 that's approx 3 truck loads of soil fill. Same as your final answer luckily unless you can order 2 and a 1/2 truck loads. Anyways nice example. Thanks.
I'm lost, so once you figured 36.67 cy of fill required for this section wouldn't you then multiply 36.67 x 1.12 = 41 cubic yards? That's adding 12% for shrinkage? Or is it 12% less? -4.4 yards = 32.3 cubic yards? If the fill shrinks after compaction then 41 cubic yards would go in and be compacted down 12% = 37 cubic yards. Is this right?
Yes you are right. You need to multiply 36.67cy by a factor of 1.12 (shrinkage factor) to account for the compaction later. Also, the 36.67 cy was actually 32cy as the 4th point was accidentally calculated as 2.5m instead of 1.5m. But overall nice example.
@@surajdarra Thank you so much! And I didn't even catch mistake. So the 4 points added up = 3.4 ÷ 4 = .85 x 900 sq. ft. = 765 ÷ 27 = 28.33 x 1.12 = 31.73 (32 cyds.) which I just now noticed is the same as you already wrote below. So great! I get it! I understand now 100%, thank you very much!!! (hint: if you hold down the Alt key on the keyboard and type 246, you will end up with the "÷" divide sign, instead of using "/" ) It works, but I thought I would try to help you somehow, since you helped me learn!
@@aaronsharp8857 Shrink is the amount the fill material can be compacted once out of the truck, so you need to order that % more than your fill volume. Swell is how much the cut material expands once it is in the truck, so you need to calculate that % more than your cut volume to correctly estimate the number of hauls (truckloads).
I dont understand, i did this method when I did my ICC soil plan reading and still failed the exam. It is really frustating i dont know what im doing wrong
