Diagram Showing Decreased Amount of Dissolved Oxygen in Delaware River, 1913
Diagram illustrating the deoxygenation of Delaware River water between 1912 and 1914 due to the "discharge of crude sewage."
This item is part of the 1914 Report on the Collection and Treatment of the Sewage of the City of Philadelphia, which can be viewed here along with two preliminary reports from 1911 and 1912. To see other illustrations from this report, click “1914 Sewage Treatment Plan” in the Subject list.
A material decrease in the amount of dissolved oxygen in the (Delaware River) water has been noted between the observations made in 1912 and in 1914, as shown in the accompanying diagram.