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FIG. 1.

AUTOMATIC FLUSHING TANK

A type design of an automatic flushing tank is shown in Fig. 1. These cost about Rs. 100 each complete, the syphon pipe alone representing some Rs. 30. Where sufficient head is not unavailable for this type, Adams’ Patent Adamic Flusher may be suitable. These cost about Rs. 70 for a 4″ pipe size, and works with a head of 10 inches.

Where sullage water is discharged into storm-water drains this should be treated in sullage filters at convenient intervals. See Fig. 18, page 36.

Masonry drains.

The most suitable form for surface drains is the semi-circular base, with side slopes of 1 to 2·4, as the discharge is only slightly less than that of the ovoid section, and the drains are more easy to construct. They can be easily swept clean, or run through with a wooden board made to fit the section, and pushed along by a boy.

The Dacca type rectangular drain, as shown in Fig. 2, page ssss1, is very suitable for narrow lanes. The dimensions can be altered to suit local conditions.