s made to
complete the re-sanding of a filter which had been nearly completed
by the old method. The precaution of filling the filter with water
was not taken, nor was any special device used for distributing the
sand. When this method was again taken up, various experiments were
tried before the present method was adopted.

Mr. Whipple's remarks on the results from the operation of filters
under winter conditions are very interesting, and, considering his
standing as an authority in such matters, they are worth careful
consideration.

In the operation of the Washington plant, it has always been
noticeable that the results were much poorer in winter than in
summer. In fact, nearly all the unsatisfactory water which has been
delivered to the city mains has been supplied during the winter
months. On the other hand, the typhoid death rate has always been
comparatively low in cold weather. These facts would seem to
indicate that the water supply was not responsible for the typhoid
conditions.

End of the Project Gutenberg EBook of Transactions of the American Society
of Civil Engineers, vol. LXXII, June, 1911, by E. D. Hardy

*** END OF THIS PROJECT GUTENBERG EBOOK SOC. CIVIL ENGINEERS, JUNE 1911 ***

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