Works for the Purification of the Water Supply of Washington, D. C.

A sand filtration plant for the purification of the public water supply of Washington, D. C., has recently been put in service, and at present about 70 000 000 gal. of water per day are being treated. The following is an account of the steps leading up to the construction of this plant, and a description of some of the more important and novel features of its construction and operation.