Leadership

OPEN VERSUS CLOSED RESERVOIRS.

Issue 6 and Volume 63.

OPEN VERSUS CLOSED RESERVOIRS. An interesting paper is published in another column, describing an experiment in covering a small service reservoir. It is by John Gaub, chemical engineer of the filtration plant at Washington, D. C, and the author argues that an open reservoir permits all manner of dust and other foreign matter—insects, microscopic growths and many other influences tending toward deterioration—to enter the water, thereby increasing the danger of pollution. The plan of providing a cover, when practicable, for the reservoir, he claims, very largely does away with these dangers, avoiding the entrance of foreign substances into the water, the increase of injurious bacteria, which breed in the sunlight, the fluctuations in the temperature of the water, and the pollution by the larvae of insects, which lay their eggs at the edges of the exposed reservoirs. The cover is thus described by Mr. Gaub: “Briefly, the cover was designed…

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