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Water Conservation In Philadelphia, Pa. The maximum summertime demand of Philadelphia at times before 1942 reached 400 mgd, which is the capacity of the plant. It was estimated that with increased popula­tion and industrial use it would far exceed this in 1942, but it was impossible to increase the supply. Conserva­tion was the only answer, and the city put it up to the consumers to use no more water than they needed, repair all leaking plumbing, curtail garden and lawn sprinkling, and develop the habit of water watchfulness. A campaign was conducted through the press, radio, civic organiza­tions and civilian defense agencies. As a result, last summer the demand averaged 20 mgd less than the previ­ous year, instead of 40 mgd more, which it was estimated would otherwise be demanded— a conservation of 60 mgd, or 1S%.A36