My pool leaks. How do I find the leak?

[iNow]

4 hours ago, Genady said:

I'd like to narrow it down as much as possible.

Grab a soil moisture probe and start poking around in a grid pattern. Record measurements taken within each cell of your grid and see where it’s wettest

https://www.bestbuypick.com/elite/best-5-soil-moisture-meters-of-2024-2/

Do it every foot or 2 for more granular precise measures

https://www.bobvila.com/articles/best-soil-moisture-meter/

[Genady]

1 hour ago, iNow said:

Grab a soil moisture probe and start poking around in a grid pattern. Record measurements taken within each cell of your grid and see where it’s wettest

https://www.bestbuypick.com/elite/best-5-soil-moisture-meters-of-2024-2/

Do it every foot or 2 for more granular precise measures

https://www.bobvila.com/articles/best-soil-moisture-meter/

Thank you. The issue is, if I understand correctly, that they are designed to measure moisture in a gardening soil, although one of the meters mentions wood and drywall. My "ground" is not a soil. It is a mix of coarse sand, rocks, and gravel. Add mostly arid climate (except in rainy season, when everything is soaking wet). I doubt there is any moisture above the leak.

[iNow]

Fair. I’m no expert on moisture meters, but I bet there’s a tool or process beyond divining rods to figure out which areas around the drain line are wettest relative to the surrounding vicinity.  

With that knowledge in hand, you could then focus your dig on a smaller section of yard. Otherwise, just redo the whole line and move on with your life. 

Edited January 17 by iNow

[swansont]

If there’s a leak in the filtration system, isolating it would allow one to measure the pool level change and see if it reverted to the evaporation value, rather than probing the ground.

[Genady]

41 minutes ago, iNow said:

focus your dig on a smaller section of yard

Yep, this is the goal.

42 minutes ago, iNow said:

redo the whole line and move on with your life

Sure, but it's not time to give up yet.

18 minutes ago, swansont said:

If there’s a leak in the filtration system, isolating it would allow one to measure the pool level change and see if it reverted to the evaporation value, rather than probing the ground.

I'll do this next. Thanks.

[Genady]

17 hours ago, Genady said:

17 hours ago, swansont said:

If there’s a leak in the filtration system, isolating it would allow one to measure the pool level change and see if it reverted to the evaporation value, rather than probing the ground.

I'll do this next

I did. Shut off all the valves to and from the motor-filter assembly. No effect. Evidently, the leak is in the underground pipes.

 

18 hours ago, iNow said:

I bet there’s a tool or process beyond divining rods to figure out which areas around the drain line are wettest relative to the surrounding vicinity.  

I got an unconventional idea for such a thing. Will try tomorrow.

[iNow]

1 hour ago, Genady said:

I got an unconventional idea for such a thing. Will try tomorrow.

Unroll a package or two of paper towels across the lawn and walk across them? See where the water soaked in most?

Curious to hear your report.  

[Genady]

31 minutes ago, iNow said:

Unroll a package or two of paper towels across the lawn and walk across them? See where the water soaked in most?

Curious to hear your report.  

Below is the close-up picture of the surface texture of my "lawn". If it did not rain recently, all is dry.

Here is another:

Edited January 17 by Genady

[TheVat]

How easy is it to push a garden stake into the ground there?  If it penetrates far enough, then pull it out and see if the tip is damp.

[Genady]

2 minutes ago, TheVat said:

How easy is it to push a garden stake into the ground there?

To push - impossible. Only by hitting with a good hammer. A wooden stake will break.

It's a mix of rocks of various sizes.

To clarify. These rocks and gravel are not a cover of the ground. They ARE the ground. At least to the depth of ~40cm.

[iNow]

2 hours ago, Genady said:

At least to the depth of ~40cm.

Sorry, how warm is that in Fahrenheit though?

 

/rimshot

[Genady]

45 minutes ago, iNow said:

Sorry, how warm is that in Fahrenheit though?

 

/rimshot

😉

[Sensei]

On 1/15/2025 at 3:14 AM, Genady said:

Not a very fast leak, about 2cm down of the water level a week. This is about twice of a normal evaporation.

What does the evaporation rate calculator say?

https://www.omnicalculator.com/physics/evaporation-rate

Does this agree with estimates of the evaporation rate of 1 cm?

 

 

 

ps. The leak, if it exists at all, should suck up the plastic wrap if placed nearby. So just cover all the walls with plastic sheeting.

Edited January 18 by Sensei

[Genady]

59 minutes ago, Sensei said:

What does the evaporation rate calculator say?

https://www.omnicalculator.com/physics/evaporation-rate

Does this agree with estimates of the evaporation rate of 1 cm?

 

 

 

ps. The leak, if it exists at all, should suck up the plastic wrap if placed nearby. So just cover all the walls with plastic sheeting.

By now, we know that there is a leak and that the leak is in a pipe between the pool and the filter.

[TheVat]

14 hours ago, iNow said:

Sorry, how warm is that in Fahrenheit though?

 

/rimshot

16 inches, 85 decibels and 1.5 Teslas.  You can subtract the decibels, if there's no rimshot.  But you keep the Teslas, for the MRI your brain needs soon.  

[iNow]

Well, in fact, I just made the Kessel Run in 12 parsecs.

 

Sorry for having some off topic fun in your problem solving thread, Genady. 

Well wishes on the leak being easy-ish to correct. 

[Genady]

6 minutes ago, iNow said:

Well wishes on the leak being easy-ish to correct.

Thank you. Almost there (I think.)

[Genady]

Solved. The leak found and fixed. Thank you to all for participation.

If you wonder how I have found the leak, the hint is here: