Temperature Effects of Point Sources, Riparian Shading, and Dam Operations on the Willamette River, Oregon

Scientific Investigations Report 2007–5185

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5185

Conversion Factors, Datums, and Acronyms and Abbreviations

Temperature in degrees Celsius (°C) may be converted to degrees Fahrenheit (°F) as follows:

°F=(1.8×°C)+32.

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).

Acronyms and Abbreviations	Meaning
7dADM	7-day moving average of the daily maximum, usually referring to water temperature.
7Q₁₀	Lowest 7-day average streamflow that would be expected to occur once in 10 years.
ACWA	Oregon Association of Clean Water Agencies.
HUA	Human Use Allowance, defined in the State of Oregon water-temperature standard as the maximum allowable increase in water temperature attributable to anthropogenic influences and quantified as 0.3°C.
NTP	Natural Thermal Potential, defined in the State of Oregon water-temperature standard as the condition which serves as a pseudo-natural baseline for comparisons of point-source and non-point-source heating effects in the Total Maximum Daily Load.
ODEQ	Oregon Department of Environmental Quality.
POMI	Point of Maximum Impact, defined as the location of a cumulative point-source heating maximum determined on the basis of model results.
PSU	Portland State University.
TMDL	Total Maximum Daily Load, defined either as the maximum allowable load of a pollutant that a water body can carry without violating water-quality standards, or more commonly, the plan created by a regulatory agency to bring a water body back into compliance with water-quality standards.
TSRF	Time series output frequency
USACE	U.S. Army Corps of Engineers.
USGS	U.S. Geological Survey.