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A water level device showing both ends at the same height. A water level (Greek: Aλφαδολάστιχο or (υδροστάθμη) [Alfadolasticho]) is a siphon utilizing two or more parts of the liquid water surface to establish a local horizontal line or plane of reference.
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.
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.
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.
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.
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 .
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Historic American Buildings Survey in Philadelphia (197 P) Historic American Engineering Record in Philadelphia (30 P) Historic districts in Philadelphia (2 C, 48 P)