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Data Series 412

U.S. GEOLOGICAL SURVEY
Data Series 412

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Conversion Factors, Datums, and Abbreviations and Acronyms

Conversion Factors

Multiply By To obtain
cubic foot per second (ft3/s) 0.02832 cubic meter per second (m3/s)
inch (in.) 2.54 centimeter (cm)
foot (ft) 0.3048 meter (m)
square mile (mi2) 2.590 square kilometer (km2)

Datums

Vertical coordinate information is referenced to the North American Vertical Datum of 1988 (NAVD 88).

Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83).

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

Abbreviations and Acronyms

Abbreviation or Acronym Definition
7Q2 7-day, 2-year low flow
AML Arc Macro Language
DEM Digital Elevation Model
EDNA Elevation Derivatives for National Applications
FGDC Federal Geographic Data Committee
HUC Hydrologic Unit Code
NED National Elevation Dataset
NHD National Hydrography Dataset
NHD Hi-Res National Hydrography Dataset High Resolution
NHD Med-Res National Hydrography Dataset Medium Resolution
NHDPlus National Hydrography Dataset Plus
TMDL Total Maximum Daily Load
USGS U.S. Geological Survey
WBD Watershed Boundary Dataset
XML Extensible Markup Language

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