In laying a 4-in. diameter house drain, which is 50ft. long, to join a sewer which is 20ft. below the level of the house, the pipes should be laid at a reasonable depth, say, 2 ft. 6 in. or 3 ft., with a proper fall to the intercepting chamber. The drain should then either be taken down by a quick fall (as in Fig. 1), or by a vertical drop (as in Fig. 2). In the figures, S indicates the sewer, and C the intercepting chamber. Such a ease as this is neither contemplated nor provided for in the Model Bye-laws.

Connecting House Drain to Deep Sewer.