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Calculating Elevation Difference and Planning

15:36
20:31
788.4K views

At 15:36 in

Teaching a NOOB how to read grade, Run a laser & change elevations on a jobsite- PT 1/2. 4k video

What happens here

After establishing the benchmark, the presenter demonstrates taking a reading further away from the benchmark to calculate the difference in elevation. He lays the 16-foot grade rod on the ground and explains that for proper drainage (1 inch drop per 8 feet), being 16 feet away means the target elevation should be 2 inches lower than the benchmark. By reading the grade rod at this new point and comparing it to the benchmark, they can determine if they need to cut or add material. The video ends here, with the actual grading work being saved for a 'Part 2'.

Goal: Calculate elevation differences to plan for cutting or adding grade.

Tools and materials

  • Grade Rod DeWalt — Measuring elevation at various points on the job site
  • Laser Receiver DeWalt — Detecting the laser beam and indicating height
  • Smartphone or Notebook Any — Recording calculated target elevations

What they say

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work zone okay so now you know that's 16 feet right the end of that rod so anywhere in that neck of the woods how much lower are you gonna have to be we're 16 feet away from our benchmark how much how many inches lower would we be 16 feet out exactly so now set your let's go see what we're reading cuz now we're gonna see how far off we are but we know the next note that you're going to take in your phone is where we've got to go to okay so if we need to go 2 inches lower than our benchmark what's the number going to be on our stick yeah yep because we're now dropping the stick down actually no we're bass-ackwards remember we're going yes right because we were at six foot two and three quarters right so we added two inches to six foot two and three quarters and that gives us six foot four and three quarters so that's the elevation that we want to hit over there so you better break that down you see how complicated all these numbers can get when you don't take notes on them and that way you've got a a record of it and then that's something that you can easily transfer to somebody else if you ever working on a site if you are gone or you get called off you can just send them the notes on everything just a nice little thing so let's see where we're actually at out there on this right out there go ahead and pull your stick up and let's read the grade now we're gonna find out how high we are so that'll tell us how much we've got to actually cut down how are we looking okay so we are 1/2 inch higher from this point to that point right so how much grade do we got to cut down to achieve our desired grade we're a half inch high and we got to cut two inches below this mark yep so that kind of gives you an indicator when you're actually running the loader and you're looking and all of a sudden you cut out five inches of material you'll be like wow that's way too much yeah right so you literally got a cut this much out but you've got to cut it and blend it over this whole area here and match it all the way up around there and match it over to there so as it kind of getting a little clearer how to read these grade rods okay good because that was the goal was just to help you understand how to do it but let's get on to the next part of this job you got the basics down to this but now we've got more to do you can leave the grade rod set right up because you're gonna need it right just keep it keep it out of the way and a nice tucked away spot alright so here's the gist of…

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