How much water does a pond lose - water loss tips

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How much water does a pond lose - water loss tips: water

To find out if the fluctuations are normal or something is wrong, you have to look more closely at the topic.

What influences are there on the water level in the pond?

  • water temperature
  • air temperature
  • wind speed
  • curling
  • air pressure
  • planting
  • Transpiration of plants
  • Nature and material of the riparian zones
Not all of these values ​​are measurable to the layman, which makes it impossible to make a clear statement about their influence on the water level.

Water level fluctuations according to Deutscher Wetterdienst

According to Deutscher Wetterdienst, fluctuations of 1mm 1 liter per m² per month are normal. For a medium-sized pond 2 meters deep, this means that about 140 liters of water per month evaporate in July. In April it is only half, but the temperatures are lower and the sun does not have that much power. In lower ponds, however, the evaporation is higher. If you are looking for details, that is the page // In any case, the evaporation should not be serious. If water is lacking regularly, it usually has other causes.

What to do if there is water loss in the pond?

That the water level drops in the summer is completely normal. This is because the sun and heat evaporate some of the water and also the plants have a higher water requirement. Especially in shallow water zones, "plenty of water disappears". But there are other causes for the loss of water.

Causes of water loss

If there is no regular water in the pond, even in cool and damp weather, it can have other causes. A hole in the pond liner is only one option. Fortunately, this suspicion is confirmed only rarely. More often, however, a missing capillary barrier is the reason for the loss of water. So water is absorbed by the soil outside the pond. Depending on the size of the pond, this can be a lot of water that never disappears.
  • the effects of weather
  • Hole in the pond liner
  • Missing capillary barrier
  • Fountains and streams
  • Hoses, pipes and technology

Hole in the pond liner

Water lilies Nymphaea

The most difficult thing about a leak in the pond liner is the search for the leak. There are some useful ways to find this. The pond water is drained in stages. If more and more water disappears, the hole is deeper and you have to let the next leg out. Otherwise, the pond can be filled up completely. Every day is marked with a chalk screed the water level. If the level stops decreasing, the water depth at which the hole is located is reached. At this height you have to search specifically. Cracks in the upper part of the film are easy to repair. The area around the leak must be cleaned carefully but thoroughly. There, with the help of special glue, a new piece of pond liner is glued on. This should be very generous measure, survive at least 5 cm to each side. The adhesive must dry according to the manufacturer's instructions, which can take one or even several days. Then the pond is refilled. If the hole is very deep down in the pond, it will be difficult to repair. Mostly the plants and fish have to be removed from the pond and if you are unlucky also the gravel and the stones that cover the ground. All water should be drained. It is associated with a lot of effort. Individual small areas can be repaired with "patches". But if there are too many, there are cracks or the film has even become brittle, it is better to replace them completely.
Tip: PVC pond liners can be repaired quite simply as just described. With rubber films (EPDM) it is a bit more complicated because different adhesives are used. The film must first be processed with a special basic cleaner. An adhesive is then applied to the dry rubber sheet. This is followed by double-sided, permanently elastic tape, which has to be especially suitable for the connection of EPDM. On this well-prepared splice is the prepared film patches. He must be pressed hard, preferably with a heavy rolling pin or a wallpaper scooter.
  • PVC film has a lifetime of 10 to 15 years
  • A rubber film lasts longer, 25 years and more

Missing capillary barrier

The capillaries in the soil have a suction effect on the pond water. Similar to plant roots that spread out on all sides, they stretch towards the water and exert a suction. Although it helps to cut off the plant roots and take back the soil a bit, a permanent solution is usually not. Earth, stones and plant roots can draw water from the pond over the edge of the pond, sometimes considerable amounts. Most of the pond edge must be completely new or a functioning capillary barrier installed. The easiest way to achieve this is by pulling up the pond liner at the edge.You push them over a small mound and dig them in behind them again. So clean edges are created, everything looks very neat. Embankment mats additionally protect the bank from tearing of the film due to tensile stress or UV radiation.
  • Suction effect on the pond water
  • Shore mats, plant bags and stone foil can cause water loss if they do not end up inside the foil seal
  • Install capillary lock

Fountains and streams

Even fountains or streams can be causes of water loss in the pond, especially in strong winds. The wind carries the water droplets in the edge area or out of the pond area. If this continues for many hours, a lot of water comes together and disappears.

Hoses, pipes, taps or valves leaking

Even technology and supply lines can be to blame if a pond constantly loses water. Here only one thing helps to check everything, so all hoses, pipes, supply lines, faucets, valves and the like. The leak must be found. Particularly inexpensive water hoses do not last very long and must be replaced frequently. First, all pumps should be turned off. The water level must be observed below. If it stays at the same level, the ports must be checked. The whole technique has to be controlled.


Even plants can damage a pond, especially the pond liner. This can happen from the outside and from the inside. Plants forming strong and pointed shoots are not suitable for pond margins. Among them are mainly bamboo and reed species. If you still want to plant these plants there, you must set a rhizome barrier of at least 80 cm around it or at least along the pond. In the pond, reeds are dangerous for the slides. It should generally only be placed in a stable and closed container in the pond. In addition, the growth is frequent and regular to control. It forms strong foothills, which perforate the film like a cheese. In the swamp area it is often the loosestrife that damages the slides, often as early as the first summer.
ConclusionIf regular water is missing in the garden pond, this can have different causes, from the natural evaporation, to a defect in the pond liner, to the deduction of plants and soil due to lack of capillary barrier. It is important to find out the cause first. More than 90 percent of it is the capillary barrier, or lack thereof. There, most of the water is lost. Often it is tedious and time consuming to repair the mistake. Often the pond owner was simply uninformed or badly advised and made mistakes when building the pond or planting. Therefore, a good preparation is especially important before you put a pond in the garden. Many things are avoidable, which saves money, time and nerves.

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