Conversion Factors and Datums


Conversion Factors


Inch/Pound to SI


Multiply	By	To obtain
Length
inch (in.)	2.54	centimeter (cm)
inch (in.)	25.4	millimeter (mm)
mile (mi)	1.609	kilometer (km)
Flow rate
cubic foot per second (ft3/s)	0.02832	cubic meter per second (m3/s)




SI to Inch/Pound


Multiply	By	To obtain
Length
millimeter (mm)	0.03937	inch (in.)
meter (m)	3.281	foot (ft)
kilometer (km)	0.6214	mile (mi)
Area
square meter (m2)	10.76	square foot (ft2)
hectare (ha)	0.003861	square mile (mi2)
Volume
cubic meter (m3)	35.31	cubic foot (ft3)
cubic meter (m3)	0.0008107	acre-foot (acre-ft)
Flow rate
cubic meter per second (m3/s)	35.31	cubic foot per second (ft3/s)

Datums


Vertical coordinate information is referenced to the Bureau of Reclamation datum, which is 1.78 feet above National Geodetic Vertical Datum of 1929 (NGVD 29).


Horizontal coordinate information is referenced to the North American Datum of 1927 (NAD 27).


Elevation, as used in this report, refers to distance above the vertical datum.

First posted April 2, 2012