![]() ![]() So what we can determine from the site boundary on the bottom of the plan, is that the land is 7.78 metres higher than the R.L 10.00 reference point located on the footpath. ![]() I find this the easiest way to set a reference line for offsetting the heights of the other R.L's above the R.L 10.00 level. I have drawn an imaginary horizontal line from the R.L 10.00. So (13.94 - 10.00 = 3.94) or 3.94 metres above R.L 10.00īelow is a section through the site on the site boundary. So 1.97 is 1.97 metres above the R.L of 10.00 So the basic maths is (11.97 - 10.00 = 1.97) Note that Land Surveyors drawings equate to metres. We work that out by taking 10.00, from 11.97. That means at this point, the land is 1.97metres above the bottom left corner of the site. If we work from left to right along the bottom of the site boundary from the number 10.00, then next number is 11.97. That is the lowest point on the site, so lets use that as our reference number to determine the heights of the levels above this reference point. If you look at the site plan, on the bottom left of the corner of the site is the level 10.00. As an arbitary number, or, according to the Australian Height Datum (AHD) ![]() The heights where these 'levels' are located are referred to as the Reduced Level (or R.L for short) The R.L can be referenced in 2 ways. The heights where these 'levels' are located are referred to as the Reduced Level (or R.L for short) The cross marks where the level was taken on the site with the equipment, and the number is the height. The cross marks where the level was taken on the site with the equipment, and the number is the height.
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