How to measure the slope of land in Brisbane

How to determine the slope of a property in Brisbane

There are a few methods for researching the slope of a property in the Brisbane City Council region. You can head straight to the site and take a look for yourself, or, if it is unclear or you can’t get to site, then using the contours within the City Plan interactive mapping is the next best thing. A step-by-step guide has been provided below:

  1. Open the interactive mapping and search a property
  2. On the right-hand side of the screen select the ‘Map Contents’ and scroll down to select ‘May Layers’ (note, these might already be open);
  3. A list of layers will drop down on the right-hand side of the screen and in this area, under the ‘Boundaries and labels’ section, click ‘Contours (2002)’;
  4. Turn all of the layers on, you will now see the contours that affect the property.
Screen Recording 2020-09-03 at 01.44.23.70 PM

How do you determine the average slope and which way a slope falls?

Using the measuring tool (found in the right-hand dropdown column in the same area as the contours), in the below image, we have measured that there is 27m between contour 17m and 14.5m. This means the site falls 2.5m over 27m. Or, for every 27m, the site will fall or rise 2.5m.

Screen Recording 2020-09-03 at 01.48.13.05 PM

If we divide the length by the fall, we will get the same calculation per vertical metre. (27m divided by 2.5m = 10.8m). So, for every 10.8m, the site falls or rises 1m, or 1 in 10.8m.

Image 2020-09-03 at 1.50.46 PM

The contours are in measurements above sea level, for example, in the above image, we have highlighted the contours with red circles. As you can see in the above image, the label on the contours are not always in the same place so it can sometimes be hard to find what level the contours are and requires you to zoom in and out.

What to learn more about property development and how to investigate protected vegetation? Check out our online courses: https://learn.urpec.com.au/all/all-courses/

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