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Question 174459: I am a 70 year old guy with a 26000 gallon swimming pool. Lately, I have been losing water. Maybe a leak or maybe natural evaporation. I would like to know how to calculate the amount of water I am replacing every couple of days. I know how much water it needs as I can tell by the amount I need to put in to raise the level in the "skimmer" until adequate. The following are variable that I know: 26,000 gal pool, 18x36 feet, amount of time it takes running my tap water to bring the level back to where it should be and the number of inches of water I put in to be where it should be.
I think there is some volume/metric formulaes I can use to ascertain how many gallons of water I am losing periodically. Am I right? Am I wrong? Am I missing a factor that is needed to calculate the results?
Thanks for any help you can give on this.
Found 2 solutions by nerdybill, ankor@dixie-net.com:
Answer by nerdybill(7384)   (Show Source):
You can put this solution on YOUR website! The easiest way to figure this out is to:
1. get a large bucket, say a 5 gallon bucket (larger the better)
2. turn on the hose full blast and time how long it takes to fill the bucket
3. from the above you can get a fairly accurate "gallons per minute" rate of the volume of water from your garden hose
4. finally, time how long it takes to raise the pool level
5. multiply the time calculated at step 4 by the rate calculated at step 3
Answer by ankor@dixie-net.com(22740)  (Show Source):
You can put this solution on YOUR website! The following are variable that I know: 26,000 gal pool, 18x36 feet, amount of time it takes running my tap water to bring the level back to where it should be and the number of inches of water I put in to be where it should be.
I think there is some volume/metric formulaes I can use to ascertain how many gallons of water I am losing periodically. Am I right? Am I wrong? Am I missing a factor that is needed to calculate the results?
:
The pool is almost sure not to be rectangular, so knowing it contains 26000 gal
is not very useful, however,
:
If we Calculate the no of gal in a layer of water 18' by 36' by 1 inch, that
would be useful.
Another words for each change of 1 inch in the water level, we know how many gal
has been lost. (or gained when you add water)
;
Change ft to inches: (18*12) * (36*12) * 1 = 93,312 cu/inches
:
Change that to cubic feet;  = 54.0052 cu ft of water
:
Change cubic ft to gal: 54.0052 * 7.481 = 404.0 gallons
:
Gal lost/gained = 404d, where d = inches (for a surface area of 18' by 36' only)
:
Find the amount of time that is required to lose or gain 1 inch
You can find the flow rate of your faucet this way, find no. of gal/min
:
Regarding evaporation rate, I have heard that you can place a bucket of water
near the pool and if the level in the bucket and the pool decrease the same
amount in the same length of time, you don't have a leak in your pool.
I cannot verify if this valid. It sounds right. Hope this helps you
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