USGS - Summary of Significant Floods in the United States, Puerto Rico, and the Virgin Islands, 1970 Through 1989

Multiply	by	To obtain
acre	4,047	square meter
acre-foot (acre-ft)	1,233	cubic meter
cubic foot per second (ft³/s)	0.02832	cubic meter per second
cubic foot per second per square mile [( ft³/s)/ mi²]	0.01093	cubic meter per second per square kilometer
foot (ft)	0.3048	meter
foot per hour (ft/hr)	0.3048	meter per hour
foot per second (ft/s	0.3048	meter per second
gallon (gal)	3.785	liter
inch (in)	25.4	millimeter
inch per day (in/d)	25.4	millimeter per day
inch per hour (in/hr)	25.4	millimeter per hour
inch per year (in/yr)	25.4	millimeter per year
mile (mi)	1.609	kilometer
mile per hour (mi/hr)	1.609	kilometer per hour
square foot (ft&ssup2;)	0.9290	square meter
square mile (mi²)	2.590	square kilometer
yard (yd)	0.9144	meter

Temperature can be converted to degrees Celsius (°C) or degrees Fahrenheit (°F) by the equations:

°C = 5/9 (°F - 32)
°F = 9/5 (°C) + 32.

Sea level: In this report, "sea level" refers to the National Geodetic Vertical Datum of 1929-a
geodetic datum derived from a general adjustment of the first-order level nets of the United
States and Canada, formerly called Sea Level Datum of 1929.

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