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Scientific Investigations Report 2007–5186

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5186

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Table 16. Results from multiple linear regression of catchment characteristics on catchment yields in the Columbia River and Puget Sound basins, water year 2000.

[Abbreviations: TN, total nitrogen; TP, total phosphorus; SS, suspended sediment; CY, calendar year; WY, water year; kg/km2, kilogram per square kilometer; cm, centimeter; NA, not available]

Catchment characteristic Coefficient
unit		 Yield (kg/km2)
TN   TP
p-value Regression
coefficient		 Standardized
regression
coefficient		 p-value Regression
coefficient		 Standardized
regression
coefficient
Urban land Percent 0.471 0.002 0.078 0.085 0.004 0.186
Agricultural land Percent .055 .005 .202 .167 .003 .142
Mean slope Percent .028 -.013 -.341 .094 -.008 -.220
Mean annual precipitation (CY 1980–97) cm .000 .414 .650 .000 .453 .800
CY 2002 fertilizer and manure application log(kg/km2) .045 .179 .279 .142 .102 .159
CY 2002 atmospheric deposition log(kg/km2) .000 .962 .301 NA NA NA
WY 2000 point-source loading log(kg/km2) .011 .108 .186 .000 .228 .258
Catchment characteristic Coefficient
unit		 Yield (kg/km2)
SS
p-value Regression
coefficient		 Standardized
regression
coefficient
Urban land Percent 0.519 0.004 0.105
Agricultural land Percent .057 .008 .246
Mean slope Percent .762 -.003 -.051
Mean annual precipitation (CY 1980–97) cm .000 .006 .667
CY 2002 fertilizer and manure application log(kg/km2) NA NA NA
CY 2002 atmospheric deposition log(kg/km2) NA NA NA
WY 2000 point-source loading log(kg/km2) NA NA NA

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