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You are here: Experts > Industry > Land Surveying > Land Surveying > Survey problems
Expert: Cliff Wagner
Date: 3/7/2008
Subject: Survey problems
Question
I have had my property surveyed. It is an irregular lot with a roughly 25 degree slop down from the road. I have two questions.
a) Is the area 'officially' the area projected on the horizontal plane, the (larger) area of the shape if I were to cut it out of cardboard or the area of a grid of rectangles (or maybe triangles) that match the contour lines? (Or maybe something else?)
b) Our city differentiates building rules based on a hypothetical 'slope' of the property. Their method of calculating this seems strange (multiply the length of each contour line times a factor divided by the area). Is there a 'common' engineering definition of a lot 'slope' that I could find somewhere?
Answer
The area (and all the survey measurements shown on your map) are on the horizontal plane for lot surveys. typically there is a statement on the survey indicating "All distances horizontal" or something similar.
Unfortunately, the city definition will override any definition I could give you. In general, slope is a percentage rise/run times 100. if the lot is fairly uniform you can approximate the slope by averaging the elevations at the front and rear of the lot and then applying the basic formula above. Again, you will have to use the city formula for any applications to the city.
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