DRAINAGE. Though it is an important axiom that a garden lake should have the outflow of its water clearly defined, the drainage of the grounds is on no account permitted to mix with the current of the lake. The low and level parts of the garden should be provided with several concealed outlets for rain water, which are carried underground to a drain beyond the site, or which may occasionally be connected with the extremity of the stream forming the lake-outlet, provided that it be at a point far removed from the ornamental areas. In certain small gardens, which represent mountain dells and are completely enclosed by artificial hills and banks, an elaborate system of hidden drainage becomes most essential, and little bamboo pipes may be discovered in places, forming the inlets to such a system. The levelling of large gardens is also carefully attended to, and the general surface drainage is carried away from the buildings in a gentle and almost imperceptible slope.
