Estimates of Ground-Water Recharge to the Yakima River Basin Aquifer System, Washington, for Predevelopment and Current Land-Use and Land-Cover Conditions

Scientific Investigations Report 2007–5007

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5007

Conversion Factors, Datums, and Abbreviations and Acronyms

Multiply	By	To obtain
acre	4,047	square meter
acre-foot per year (acre-ft/yr)	1,233	cubic meter per year
cubic foot (ft³)	0.02832	cubic meter
cubic foot per second (ft³/s)	0.02832	cubic meter per second
gallon per day (gal/d)	0.003785	cubic meter per day
inch (in.)	2.54	centimeter
inch (in.)	25.4	millimeter
inch per year (in/yr)	2.54	centimeter per year
foot (ft)	0.3048	meter
mile (mi)	1.609	kilometer
million gallons per day (Mgal/d)	0.04381	cubic meter per second
section (640 acres or 1 square mile)	259.0	square hectometer
square foot (ft²)	0.09290	square meter
square inch (in²)	6.452	square centimeter
square mile (mi²)	2.590	square kilometer

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

°F=(1.8×°C)+32.

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

°C=(°F-32)/1.8.

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.

Abbreviation and Acronym	Meaning
AET	actual evapotranspiration
CRBG	Columbia River Basalt Group
DEM	digital elevation model
DOA	Washington State Department of Agriculture
DPM	Deep Percolation Model
GIS	Geographic Information System
HRU	Hydrologic Response Unit
I/P	ratio of irrigation to precipitation
km	kilometer
LULC	land use and land cover
m	meter
MMS	Modular Modeling System
PRMS	Precipitation-Runoff Modeling System
PWS	public water supply
R/P	ratio of recharge to precipitation
R/T	ratio of recharge to total water input
Reclamation	Bureau of Reclamation
S	quantity of water that root/soil zone can hold
SAT	quantity of water above TWAC
SOAC	Systems Operations Advisory Committee
T	total water input: precipitation plus irrigation
TAWC	total available water capacity
TWSA	total water supply available
USGS	U.S. Geological Survey
WaDOE	Washington State Department of Ecology
WRIA	Washington State Water Resource Inventory Area
WY	water year
YN	Yakama Nation