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The water level at each end of the tube will be at the same elevation, whether the two ends are adjacent or far apart, so a line between them will be horizontal at its midpoint and a shed base, building foundation or similar structure laid out using several such lines will be "horizontal" within building tolerances on any scale over which use ...
NAVD 88 was established in 1991 by the minimum-constraint adjustment of geodetic leveling observations in Canada, the United States, and Mexico.It held fixed the height of the primary tide gauge benchmark, referenced to the International Great Lakes Datum of 1985 local mean sea level (MSL) height value, at Rimouski, Quebec, Canada.
A Philadelphia rod is a level staff used in surveying. The rod is used in levelling procedures to determine elevations and is read using a level. A Philadelphia rod consists of two sliding sections graduated in hundredths of a foot. On the front of the rod the graduation increasing from zero at the bottom.
Boathouse Row is a historic site which is located in Philadelphia, Pennsylvania, on the east bank of the Schuylkill River just north of the Fairmount Water Works and the Philadelphia Museum of Art. It consists of a row of fifteen boathouses housing social and rowing clubs and their racing shells .
HABS—Historic American Buildings Survey projects in Philadelphia. Pages in category "Historic American Buildings Survey in Philadelphia" The following 197 pages are in this category, out of 197 total.
Philadelphia Water began this program in 1999 when the Office of Watersheds was created. The Delaware and Schuylkill rivers each make up about half of the Philadelphia area's drinking water supply, and Philadelphia Water delivers about 250 million gallons of this drinking water to customers on a daily basis through its treatment plants.
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The Fairmount Water Works was initially constructed between 1812 and 1815 on the east bank of the Schuylkill River.The Water Works initially consisted of a 3 million US gallons (11,000,000 L) earthen reservoir atop Faire Mount at the present site of the Philadelphia Museum of Art, and a pump house with two steam engines to pump water.