Source: Pima County Wastewater Management Department, Tucson, Arizona.

Design drawings for the incline on the Indian Run Sewer (flight sewer), Philadelphia, Pennsylvania, 1904.

Source: ""The Indian Run Sewer, Philadelphia," The Engineering Record, Volume 50, No. 27 (31 December 1904), p. 779.

Plan for a 61-foot drop manhole and connecting sewer at Washington and Arlington streets, Los Angeles, 1909.

Source: Tom Bates, Lancaster, Pennsylvania.

Valve designs for sewer systems discharging into the ocean, circa 1909.

Source: Colonel E. C. S. Moore, Sanitary Engineering, Volume I, 3rd Edition revised by E. J. Silcock (Philadelphia: J. B. Lippincott Company, 1909), p. 25, 26.

Design for a combined sewer system (combining storm water and sewage) that allows small rain runoff to enter the sewer, while large (and presumably cleaner) runoff is discharged into a river or body of water, circa 1909.

Source: Colonel E. C. S. Moore, Sanitary Engineering, Volume I, 3rd Edition revised by E. J. Silcock (Philadelphia: J. B. Lippincott Company, 1909), p. 45.

Design for a combined sewer system (combining storm water and sewage) with a ball and lever to cut off storm water when needed, circa 1909.

Source: Colonel E. C. S. Moore, Sanitary Engineering, Volume I, 3rd Edition revised by E. J. Silcock (Philadelphia: J. B. Lippincott Company, 1909), p. 46.

Trench for sewer and storn-water drain, showing concrete support to pipes and use of sight rail to ensure proper gradient of the invert, circa 1910.

J. T. Brown, W. H. Maxwell, editors, "Sewerage," The Encyclopaedia of Municipal and Sanitary Engineering (New York: D. Van Nostrand Company, 1910), p. 427.

Pipe and brick lamphole designs, circa 1916.

Source: A. Prescott Folwell, Sewerage - The Designing, Construction, and Maintenance of Sewerage Systems, 7th edition (New York: John Wiley and Sons, 1916), p. 159.

Design details for manhole, lampholes, and manhole covers, circa 1916.

Source: A. Prescott Folwell, Sewerage - The Designing, Construction, and Maintenance of Sewerage Systems, 7th edition (New York: John Wiley and Sons, 1916), p. 159.

Design details for flush tank, inlets, drop manhole and house connection, circa 1916.

Source: A. Prescott Folwell, Sewerage - The Designing, Construction, and Maintenance of Sewerage Systems, 7th edition (New York: John Wiley and Sons, 1916), p. 161.