I would like any suggestions on how to do this with a tape. (This is pretty non controversial, right?) I have spent a career trying to figure out how to measure things, and I am curious. From the comments in this group, the problems I mention below must have been solved.
First you stretch the tape along the side of the pool. That would work well, but how are you sure you are aligned with the walls, or that the walls are square? Also, you need to measure in several lanes, rather than the side.
So you get in the pool and hold the tape against the walls, 1 foot below water level. The problem is that the tape sags, and any measurement will overestimate the length of the pool by a significant amount. You could pull the tape tighter, but I suspect before the tape gets tight enough, your tape will stretch or break. (I used to assign that as an intro physics problem). I suppose you could build a support structure across the pool, but that would be a pain in the neck, and you would have to move it from lane to lane.
Getting the water out of the pool would make that support structure easier, but the water weighs a lot. It almost certainly causes the walls to bend outward, especially in the deeper pools. (How do the people who design above ground, temporary competition pools do it?) I don't know how much the walls will move, but how do you account for that? (and by the way, how do the masons make sure their plaster/tiling is correct in an empty pool?)
Here is an idea - you lower the water level by a foot or so, and build a *floating* support structure for the tape. I think that would solve most of the problems. Has anyone done that?
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I linked to this old thread while reading the current one on "pool length" and could not resist offering a simple solution to the problem. I have built more than a hundred houses over the years and currently oversee construction for Habitat for Humanity-Maui. Our new homes are usually simple rectangles and we follow the industry standard of setting up batter boards off each corner. The batter boards are all set to the same level and enable us to pull masons line to outline the perimeter of the building. It is simple to "tune up' these strings to ensure squareness and length of sides, sometimes to "fanatic out" we will even take into account the thickness of the line, for example using the inside of the string as our guide.
Seems like measuring a pool would be similar. the goal being to set two parallel lines directly over the most inward part of each of the opposing walls. Then just measure the distance between the strings making sure the tape measure runs square to the lines and does not sag, not difficult since we could pull the tape on the deck on either side of the pool.
I linked to this old thread while reading the current one on "pool length" and could not resist offering a simple solution to the problem. I have built more than a hundred houses over the years and currently oversee construction for Habitat for Humanity-Maui. Our new homes are usually simple rectangles and we follow the industry standard of setting up batter boards off each corner. The batter boards are all set to the same level and enable us to pull masons line to outline the perimeter of the building. It is simple to "tune up' these strings to ensure squareness and length of sides, sometimes to "fanatic out" we will even take into account the thickness of the line, for example using the inside of the string as our guide.
Seems like measuring a pool would be similar. the goal being to set two parallel lines directly over the most inward part of each of the opposing walls. Then just measure the distance between the strings making sure the tape measure runs square to the lines and does not sag, not difficult since we could pull the tape on the deck on either side of the pool.
