Quote Originally Posted by PoolDoc View Post
Method #1: Measure the volume exactly, when you next empty and fill, by reading your meter before and after, and the deducting average water use during the period.

Method #2: 'Grid' the pool, by laying out a rectangle to enclose the pool. The sides should be divisible by 3. Use stakes or tent pegs to layout nylon lines, 3 long wise, and 3 cross wise, and count the 'squares. Count each section as 0, 1/2 or 1. Measure the depth in each 1/2 or 1 square. Leap frog the lines, to create the new squares. Calculate the volume of each square (9 sft x depth or 4.5 sft x depth). Sum the volumes.

It will be easier if you use graph paper to track your work. This should be within 20% of actual volume.
Wow. Thanks! Will probably try the second method. I'm guessing:

1. I can use a plumb line (something weighted) to measure the depth of the pool.
2. The accuracy of the measurement for this approach is based on how small I make the squares?

One side of the pool is higher than the other. Thus, it may be a slight challenge to secure the lines on that side of the pool. However, as that side is a wall with stacked slate, I can just stick something in horizontally with an eye-let.

As an aside based on your statement of "when you next empty and fill", is there any reason I would need to completely empty the pool on a regular basis? I presumed I would only ever need to empty to repaint or resurface the pool.