WATER IN THE GARDEN I9I 



wood like that illustrated. Fresh cement 

 of good quality should be used, tempered with 

 a third part of sharp sand. 



Pipes for inlets and outlets should be inserted 

 when the sides of the pond are being made. If 

 a single pond is installed it will only be neces- 

 sary to carry a waste-pipe from its bottom to 

 the drain. This should be done in a straight 

 line, if possible, to facilitate unstopping in case 

 of obstruction. The most suitable piping 

 is iron gas pipe of not less internal diameter 

 than one and a half inches. A plug must be 

 provided to close the inlet, and this may be 

 a simple cone of wood fitted to the bore of 

 the pipe. 



When two or more ponds are made, they 

 should be connected by piping into a single 

 system, the waste-pipe connecting the one 

 nearest the drain to it. 



If all ponds stand at the same level, the 

 connecting pipes may enter and leave at the 

 bottom, but if the levels are stepped, as would 

 be the case on sloping ground, the overflow 

 from each pond to the next lower one of the 

 series must be placed at the water-line, other- 

 wise the water would all flow to the lowest 



