Kelly Barnes Dam Flood of November 6, 1977, near Toccoa, Georgia
by C.L. Sanders and V.B. Sauer
U.S. Geological Survey Hydrologic Investigations Atlas HA-613
1979

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FACTORS FOR CONVERTING INCH-POUND UNITS TO
INTERNATIONAL SYSTEM (SI) UNITS

The following factors may be used to convert the inch-pound units published herein to the International System of Units (SI).

Multiply inch-pound	By	To obtain SI units units
	Length
inch (in.)	25.4	millimeter (mm)
	0.0254	meter (m)
foot (ft)	0.3048	meter (m)
mile-(m)	1.609	kilometer (km)
	Area
acre	4047	square meter (m2)
	0.4047	*hectare (ha)
	0.4047	square hectometer (hm2)
	0.004047	square kilometer (km2)
square mile (mi2)	2.590	square kilometer (km2)
	Volume
cubic foot (ft3)	28.32	cubic decimeter (dm3)
	0.02832	cubic meter (m3)
acre-foot (acre-ft)	1233	cubic meter (m3)
	1.233x10	cubic hectometer(hm3)
	1.233x10	cubic kilometer (km3)
cubic yard (yd3)	764.6	cubic decimeter (dm3)
	0.7646	cubic meter (m3)
	Flow
cubic foot per second	28.32	**liter per second (L/s) (ft3 ls)
	28.32	cubic decimeter per second (dm3/s)
	0.02832	cubic meter per second (m3/s)
	Slope
foot per mile (ft/mi)	0.1894	meter per kilometer (m/km)
* The hectare is approved for use with the International System (Sl) for a limited time. See [U.S.] National Bureau of Standards Special Bulletin 330, 1977 edition, page 12.
** The liter is accepted for use with the International System (SI). See [U.S.] National Bureau of Standards Special Bulletin 330, 1977 edition, page 11.

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