Main Drainage Works of the City of Boston (Massachusetts ...)
Main Drainage Works of the City of Boston (Massachusetts ...)
Boston (Mass.). Engineering Dept
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is from a photograph taken at this point. As a precaution, where the foundation seemed insecure, the vertical diameter of the sewer was increased by six inches, so that, should slight unequal settlements occur, the invert may be brought to its true grade without lessening the desired size of the sewer. For about 76 feet, to avoid interfering with the street surface, the intercepting sewer was built entirely within an abandoned common sewer (Fig. 15, Plate VIII.). At the upper end of the interce...pting sewer, at Prince street, the gi*ade of the invert is about four feet above mean low water, which is the highest elevation of any portion of the Main Drainage Sys- tem. At this point a direct connection with the harbor has been made, which is closed under ordinary circumstances by a three feet square penstock gate. By opening this gate at the time of high tide the sewer can be thoroughly flushed. Digitized by Google Plate IX? x! («.: I'i^^ jft^ Digitized by Google PUMPING-STATION. 53 CHAPTER VII.
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