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More information is needed in order to answer this question. The size of the pond, preferably in square meters.
alot! 1,234,345.
The answer will depend on the size of the pond!
If your pond isn't at least 20 ft. deep, at some point. It is almost a guarantee that the pond will need chemicals to help keep it clean. Shallow water, because of heat gain and lack of circulation and aeration and runoff and the fill around the pond; even the vegetation and animals can lead to problems.
statues of birds will usually deter an egret. also, your pond should be deep enough for the koi to stay out of range, at least 36 inches deep. i have rock ledges in my pond for the fish to hide under. if your pond has a ledge, fill it with plants so there is nowhere for the bird to stand.
It needs to be atleast 2 ft deep if you want to keep the fish in the cold weather however i would suggest going much deeper to be on the safe size, a small pond can have steep sides to dig to about 3 ft and there will be no problems with the fish in cold weather, other than that it is not important how deep the pond is, as long as they can swim freely.
509.7 litres
9,510.19 Gallons
they can be shallow or deep.
598 Imperial gallons, approx.
The volume you are trying to fill is 120000 cubic feet(100 x 100 x 12)1 cubic foot = 6.22883288 Imperial gallonsSo your pond of 120000 cubic feet would take about 747456 gallons to fill.or1 cubic foot = 28.3168466 litresSo your pond of 120000 cubic feet would take about 3397920 litres to fill.
The conditions necessary for a fish pond would be pretty much anywhere you decided to set one up. You will need to dig a hole, cover with a garbage bag lining, place the pond over the lining and fill with water. You will need to treat the water before adding the fish.