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METRIC CONVERSIONS AND VERTICAL DATUM <br />Inch-pound units used in this report may be expressed as metric units <br />by use of the following conversion factors: <br />Multiply By To obtain <br />inch 25.40 millimeter <br />foot 0.3048 meter <br />mile 1.609 kilometer <br />square foot per second 0.0929 square meter per second <br />acre 0.4047 hectare <br />foot per mile 0.1893 meter per kilometer <br />square mile 2.59 square kilometer <br />cubic foot per second 0.02832 cubic meter per second <br />ton 0.9074 megagrams or metric ton <br />ton per acre 2.242 metric ton per hectare <br />pound 0.4536 kilogram <br />pound per second per foot 7.22x10'6 kilogram per second per foot <br />degree Fahrenheit (°F) (temp°F-32)/1.8 degree Celsius (°C) <br />National Geodetic Vertical Datum of 1929 (NGVD of 1929) is a geodetic <br />datum derived from a general adjustment of the first-order level nets of both <br />the United States and Canada, formerly called mean sea level. <br />vi