Joined: July 2004
||Posted: 01 Mar. 2018,11:48
Set up your level in a position that can clearly see all relevant level points on the site, or as many as is possible. Iíd suggest somewhere a metre or so from the top right corner of the house, and set as high as you can comfortable reach, even if stood on a box, say 2m (ish) above GL.
Take a staff reading at your datum point. I donít know what points are in existence, but, again for argumentís sake, letís assume the footpath at the front of the property is extant, and has the level shown on your plan : 3190
Knock in a masonry nail at this point so you can find it again if necessary.
Letís say, for argumentís sake, that the reading from the staff on this datum point says 1950
You know the plan has this point as 3190, but your staff says 1950, so you would need to add 1240 to the staff reading to get the same result.
Now, if you move the staff to a peg marking, say, the lower RH corner of the building, you know that the level here is supposed to be 5000 but you also know that your level is giving readings at 1240 below the plan levels, so you need to set a level at this point/peg that is 5000 minus 1240 = 3760
When you get a staff reading of 3760, you know that, in relation to your original datum point on the footpath, this point/peg is 1810 higher (5000 Ė 3910)
Your staff reading at datum was 1950. Add the 1810 rise that is required: 1950 + 1810 = 3760. You need to set the peg to a level read from the staff of 3760
Now, you can use the same technique to establish levels elsewhere on the site.
Does this make sense?
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