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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Originally posted by Howard
Suppose you are running a 3 day state meet in a pool with a bulkhead. To be correct you would have to measure the pool 4 times. Can you give us a very rough estimate on what it would cost to have a qualified Land Surveyer to do that many measurements?
It depends on what part of a country you're in, as their hourly rates vary drastically, depending on a local economy and local real-estate values.
For the measurements, the stuff a surveyor would have to do is pretty basic (compared to the other stuff they normally do), they would probably charge you about an hour to do this, it would be two guys for an hour... (it would take less then that, but most would charge a minimum of an hour) each time they come out.
You want to hire someone who is close, not someone who would have to drive two hours to get to the pool.
In Southern California, in LA area, a 2 man crew wouldcost around $180 per hour, 200 miles away, the prices can be down to a $100/per hour for a 2 man crew.
In other parts of the country, with different rates, it could be as low as $50 per hour for a 2 man crew.
If it's on a weekday, near the end of the day, and you make friends with a local surveyor, they may be able to just swing by and do the measurememnts really quickly for you... as a donation, or as a favor.
Originally posted by Howard
Suppose you are running a 3 day state meet in a pool with a bulkhead. To be correct you would have to measure the pool 4 times. Can you give us a very rough estimate on what it would cost to have a qualified Land Surveyer to do that many measurements?
It depends on what part of a country you're in, as their hourly rates vary drastically, depending on a local economy and local real-estate values.
For the measurements, the stuff a surveyor would have to do is pretty basic (compared to the other stuff they normally do), they would probably charge you about an hour to do this, it would be two guys for an hour... (it would take less then that, but most would charge a minimum of an hour) each time they come out.
You want to hire someone who is close, not someone who would have to drive two hours to get to the pool.
In Southern California, in LA area, a 2 man crew wouldcost around $180 per hour, 200 miles away, the prices can be down to a $100/per hour for a 2 man crew.
In other parts of the country, with different rates, it could be as low as $50 per hour for a 2 man crew.
If it's on a weekday, near the end of the day, and you make friends with a local surveyor, they may be able to just swing by and do the measurememnts really quickly for you... as a donation, or as a favor.
