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Scientific Investigations Report 2007–5186

Scientific Investigations Report 2007–5186

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Conversion Factors, Vertical 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 per year (in/yr) 25.4 millimeter per year (mm/yr)
mile (mi) 1.609 kilometer (km)
million gallons per day (Mgal/d) 0.04381 cubic meter per second (m3/s)
pound, avoirdupois (lb) 0.4536 kilogram (kg)
pound per day (lb/d) 0.4536 kilogram per day (kg/d)
pound per year (lb/yr) 0.4536 kilogram per year (kg/yr)
pound per year per square mile [(lb/yr)/mi2] 0.1751 kilogram per year per square kilometer
square mile (mi2) 2.590 square kilometer (km2)
ton per day (ton/d) 0.9072 metric ton per day
ton per year (ton/yr) 0.9072 metric ton per year
ton per year per square mile [(ton/yr)/mi2] 0.3503 metric ton per year per square kilometer

Concentrations of chemical constituents in water are given in milligrams per liter (mg/L).


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

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

Projections are from the Lambert Conformal Conic (Oregon Lambert Projection).

Abbreviations and Acronyms

Abbreviations and Acronyms Meaning
AMLE Adjusted Maximum Likelihood Estimation
CWS Clean Water Service
CY calendar year
DMR Discharge Monitoring Report
Exchange Pacific Northwest Water-Quality Exchange
FATC flow-adjusted trend in concentration
NAWQA National Water-Quality Assessment
NFATC non-flow-adjusted trend in concentration
NPDES National Pollution Discharge Elimination System
NWIS National Water Information System
ODEQ Oregon Department of Environmental Quality
ORWD Oregon Water Resources Division
Pcode parameter code
PCS Permit Compliance System
RM river mile
SIC standard industrial classification
SS suspended sediment
STORET STOret and RETrieval
TKN total Kjeldahl nitrogen
TMDL Total Maximum Daily Load
TN total nitrogen as N
TP total phosphorus as P
USEPA U.S. Environmental Protection Agency
USGS U.S. Geological Survey
WDOE Washington State Department of Ecology
WWTP wastewater treatment plant
WY water year

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