The pool should be connected with the general water supply, if practicable, and a drain provided (Fig. 141) so that the pool may easily be emptied, cleaned and refilled. The most economical and practical method to arrange for the overflow and drainage is to have a standpipe with a ground beveled end to fit in a socket set at the low point of the pool. The size of the pipe will depend on the amount of water, but, for ordinary purposes, a one and one-half inch pipe is sufficient to carry off the overflow. To drain the pool it is only necessary to remove the standpipe. Another method of providing for the overflow and drainage is to have a concealed standpipe (Fig. 142) built into the end wall of the pool. When the water rises to the top of the standpipe at A, it overflows. To drain, the stand-pipe is removed through a concealed opening at B.
Where the drain is controlled by a valve, the valve should be set in a small box with an iron cover set flush with the grade.
From a point immediately outside the walls of the pool the water may be carried off by a three-inch terra cotta pipe.
The appearance of the pool will be greatly improved by placing an inch of clean pebbles over the bottom.
Fig. 142. - Concealed stand-pipe for garden pool overflow and drainage..
Oftentimes garden pools are placed at the ends of the gardens fed from a fountain head placed in a vertical wall.
The construction of such pools should be similar to that already outlined.
The vertical wall should rise above the wall enclosing the garden to emphasize the feature.
Fountains and pools so located should be provided with a good background, preferably evergreens of a dark shade; the Red Cedar and similar types are admirable for the purpose.
The planting near ■ garden pools should include some bright colored flowering plants in positions where they will reflect all the glory of their color on the surface of the water, for the pool is a delightful outdoor mirror, reflecting all its environment with a softness that is most charming.
The garden pool is not complete, nor affording one of its greatest pleasures, if it does not support some Water Lilies (Fig. 140).
In tightly built pools it is necessary to plant the Lilies in tubs. A very economical and satisfactory tub may be provided by cutting in two an old vinegar or liquor barrel.
The soil for the proper support of the Lilies should consist of a good loam well enriched with decomposed cow manure, equal to one-fifth of the entire bulk. On top of this place two inches of bar sand. The tubs should be set to a depth that will allow about six inches of water over the soil.