How To Survey A Kidney Pool.  

by Pool Builders on 11-30-2011 in Articles

Pool covers that fit well will result in reduced pool chemicals usage as well as time spent manually cleaning. To make the most of your cover then, you need to provide accurate dimensions to the manufacturer. A swimming pool cover that does not fit properly is also likely to wear through more quickly, lessening its life.

Most pools such as a standard rectangular pool are easy enough to measure. Some shapes such as a kidney or a freeform however are much more difficult. A variety of different methods exist, but this is our preferred method and has produced well fitting covers time after time. The method we recommend is the Triangulation Method. Using this method we identify a number of points around the perimeter, and take measurements from two different points that then cross reference the original one, allowing us to build up a picture of the perimeter.

The first step is to mark, using chalk, all the points that we will measure to. Start with 1, and then mark points clockwise around the edge approximately 18" apart, finishing just before your original point 1. On reasonably straight stretches they can be further apart, but on curved areas they may need to be closer. On most pools you are likely to have marked about 30 to 35 points when you come back to the start.

The next step is to mark the A and B reference points. Ideally these should be to one side of the pool, approximately 10 feet from the edge, and slightly wider apart than the pool is long. Mark one as point A, and the other as point B.

Now take the measurement from point A to all the points in turn, starting with 1 and finishing with the last point. Record these as A1, A2, A3, etc. It is vital that the end of the tape at point A is held securely, either with help from someone or secured with a stake or something similar. Also you need to make sure that the tape does not become entangled with any obstructions such as plant pots or pool ladders. Obviously the tape needs to be kept straight at all times and any deviation will cause inaccuracies in the finished plan. Then repeat the process from point B.

Some pools will have some fixed obstructions such as ladder uprights or diving boards. These fixed points also need to be recorded from points A and B and noted on the recording sheet so that the manufacturer can make allowances for these. For example incorporating slits to accommodate ladder uprights.

Lastly, it is important to provide a sketch diagram of the pool showing approximate location of points A and B.

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