Leakinjg pond.

[william jones]

Because you will never be able to create a seal between the pond liner and the substrate so that sufficient air pressure will be created to have the air forced out through the liner and into the water column.
Give it a try and you'll see what I mean.

.

Hello MitchM,
I can see what you mean but with only 8" of water in the pond I can see the liner floor being lifted with the air pressure beneath so I'm sure that it would produce a visible column of bubbles if the liner was torn anywhere and I can't. Even though there must be enough pressure to inflate a car tyre. The necessary pressure may not be getting to where the leak is. So I am rushing to the conclusion that I should just change the 18 year old liner and have done with it.
Anyway thanks for all the comments.

 

[william jones]

Most definitely, wouldn't blow the air! Wouldn't work very well at all. I have a 2000 gallon pond and evaporation is so insignificant that if I had a leak, I'd know it. Meyer said a 1/4 inch/ day wouldn't be a leak. Maybe, maybe not but if the line at the weir on my savio were down 1" every 4 days, I'd check my water fall to see if it were running back. If it was good, I'd know I had a leak. I rarely ever add water as rainfall usually balances it out. In North Cornwall, your temps are quite cooler than here in the summer and your rainfall should balance out your pond. Exactly how much water are you losing in how long a period?

I'm trying to get a number right now but it takes time because it can rain for long periods or not rain at all and this makes it difficult to get any idea. That's Cornwall for you!

 

[william jones]

I'm trying to get a number right now but it takes time because it can rain for long periods or not rain at all and this makes it difficult to get any idea. That's Cornwall for you!

It really depends on the configuration of your pond and the total surface area of exposed water. The pond and stream that I had was a total of 700 sq.ft. exposed water surface (stream, wetlands and pond). Because water loss manifested itself only in the main pond basin, it was normal for me to lose 1" to 2" of water daily. Absolutely no leaks...all evaporation and evapotranspiraton.

Your numbers give me hope because I don't lose anything like this much but it is difficult to be accurate because the rainfall is so intermittent and variable. I'm still trying. The pond surface area is about 50 sq ft when full. What on earth is evapotranspiraton.

 

[Meyer Jordan]

What on earth is evapotranspiraton.

It is the sum of evaporation and water loss from plants during the photosynthetic process (transpiration)..

 

[william jones]

It is the sum of evaporation and water loss from plants during the photosynthetic process (transpiration)..

Thanks, makes sense, but I looked it up anyway.