103. If there is too much water in your pond, some of the water
may flow over the banks. This may wash the banks away and some of your fish may
104. You can use an overflow to keep the water in your pond from
rising over the banks.
105. The better outlet you learned about in Items 97- 101 will
act as an overflow.
106. If you use a straight pipe outlet or a siphon to let water
out of your pond, you will need another kind of overflow.
107. This kind of overflow can be made from a piece of bamboo or
a pipe of plastic or metal. The overflow pipe should be about 6 centimetres in
108. The overflow pipe should be long enough to reach through
the top of the bank from the inside of the pond to a place far enough on the
outside to keep overflow water from washing away the bank. You will need a pipe
about 4.5 metres long to do this.
109. If you cannot get a pipe that is long enough, join short
pieces of pipe or bamboo together. (see items 90 and 91).
110. It is best to place your overflow in the bank at the lower
end of your pond right above the outlet so that the water that overflows can run
off in the outlet ditch.
111. If you are going to put the overflow over the outlet, you
can put it in the same gap that you dug for the outlet in Item 92. The water-
line should be about 50 centimetres below the top of the bank, so put your
overflow there as you rebuild the bank.
112. If you are going to put the overflow in another place, you
will have to dig another gap in the bank about 50 centimetres deep.
113. When the pond is full, the overflow will keep the water
about 60 centimetres deep at the shallow upper end and about 90 centimetres deep
at the deepest Dart.
Keep the water