The best way to prevent a leak in your pond is to get it built by a professional.
The next best way is for you to call one to take a look. Most diy ponds develop leaks due to poor design and material.
For example, many people decide to forgo adding gravel, thinking their ponds will be easier to maintain this way.
This causes the liner to be susceptible to damage
when the pond is being serviced.
When looking for the source of the leak, check the low edges along a stream or a waterfall.
All you have to do is walk along the mentioned areas and visually inspect for wet soil, which indicates you are losing water.
The edges of streams are common locations for leaks because many people, when building, either do not
tamp the ground enough or they do not leave enough excess liner.
The first step in fixing your leaking pond is finding out if there is actually a leak.
Perfectly functional ponds will still lose water due to weather and evaporation.
One of the biggest contributors of water loss is
splashing water from your waterfall or stream. The bigger the splash radius, the bigger the water loss.
If you feel like you have to bring out the garden hose way too often
or much more than you had to in the past, you probably have a leak somewhere in your pond.
How to pinpoint where your are losing water
The first step in diagnosing a leaking pond is to determine whether there is a hole in the liner. You can test this by shutting off your pump for about 24 hours ( make sure your fish have oxygen! ) and seeing
if the leak continues. If your leak magically disappears while your pump is unplugged, it means there are no holes in your liner. If you continue to lose water with the pump off, there is a hole somewhere in your liner.
Below you can read the scenario which best applies to you.
Leak stops when pump is off
You must turn the pump back on and check along your stream and waterfall to see if there is any water loss occurring. An easy way to tell is to check for wet spots along the ground. If there is no sign of wet ground,
your plumbing may be the problem. Pond plumbing applies to everything involved in moving water from the pump to the waterfall and/or stream. This includes components such as pvc, pvc connections, check valves, splitters, etc. It may be hard
to access these components as they are often buried underground.
Leak continues when pump is off
This scenario means you have a hole somewhere in your liner where the water loss is occurring. The last part of the previous sentence "where the water loss is occurring" is important because it is
possible that your pond has two separate bodies of water and only one continues to leak when the the pump is off. The next step is to figure out the location of the hole. For this you must let your pond continue to leak until
it stops on its own. You must be careful during this step as you may have to relocate your fish if it seems like your pond is going to leak out all the way. This would only occur if you had a hole at the bottom of your pond.
The water level of your pond when your leak stops on its own is going to be the same level as the leak. Imagine a full 2 liter bottle of coke with a hole 4 inches from the bottom.
That bottle would leak out until it has reached 4 inches from the bottom, the level of the hole. To find the exact location of the hole, your must check around the
perimeter of the water level.
How to patch EPDM pond liner
- -Firestone Quick Prime Plus for Pond and Water Features
- -EPDM liner
- -marine grade polyurethane caulk
This guide is only for patching EPDM liner and is not applicable for other types. Once you have found the hole and have made it accessible, you can start preparing your old liner for patching. You must wipe the location where
the patch will be applied so that it is free from any debris or obstructions. You can use a wet towel or clothe for this purpose. Once the area is clean, you must obtain a piece of EPDM liner to use as a patch for the old one.
While the exact size is unimportant, this piece should fully cover the hole. Next, apply the Firestone Quickprime on both the patch and the old liner where the patch will be applied.
Then, you can press the patch against the hole so that the two are fully joined. Last, apply some marine-grade polyurethane along the edges of the patch so that it is fully waterproof.