PURCHASE IMAGE REPRODUCTION
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PHILADELPHIA STREETS DEPARTMENT, SURVEY AND DESIGNS BUREAU
Frank Morelli
Survey Bureau Manager
Philadelphia Streets Dept.
Phone: (215) 686-5540
Email: frank.morelli@phila.gov
Plan, Diagram showing quantity of water reaching sewer based upon the Philadelphia Formula, corresponding grade, size and velocity when running full. Department of Public Works, Bureau of Surveys, 1915 ca.
Original size: 25 x 31 in. (estimated)