Estimated Average Annual Sheet and Rill Erosion in Relation to T Value for Cultivated Cropland by Year

State of Oregon.
National Resources Inventory Results.
Estimated for Non-Federal Lands Only.
 

See Details Page for further explanations.
See the National NRI Glossary for complete definitions.

1982 Cultivated Cropland.

1982 Cultivated Cropland.
T=0 Estimate = 200 acres.
T=0 Error = 200 acres.

1982 Cultivated Cropland.
>0<=T Estimate = 2,009,000 acres.
>0<=T Error = 84,300 acres.

1982 Cultivated Cropland.
>T<=2T Estimate = 536,300 acres.
>T<=2T Error = 31,900 acres.

1982 Cultivated Cropland.
>2T<=3T Estimate = 341,800 acres.
>2T<=3T Error = 31,000 acres.

1982 Cultivated Cropland.
>3T<=4T Estimate = 193,100 acres.
>3T<=4T Error = 29,000 acres.

1982 Cultivated Cropland.
>4T<=5T Estimate = 128,600 acres.
>4T<=5T Error = 18,200 acres.

1982 Cultivated Cropland.
>5T Estimate = 247,100 acres.
>5T Error = 23,800 acres.

1982 Cultivated Cropland.
Total Estimate = 3,456,100 acres.
Total Error = 96,800 acres.

1987 Cultivated Cropland.

1987 Cultivated Cropland.
T=0 Estimate = 0 acres.
T=0 Error = 0 acres.

1987 Cultivated Cropland.
>0<=T Estimate = 1,985,800 acres.
>0<=T Error = 84,300 acres.

1987 Cultivated Cropland.
>T<=2T Estimate = 504,700 acres.
>T<=2T Error = 35,300 acres.

1987 Cultivated Cropland.
>2T<=3T Estimate = 236,700 acres.
>2T<=3T Error = 35,400 acres.

1987 Cultivated Cropland.
>3T<=4T Estimate = 109,200 acres.
>3T<=4T Error = 18,600 acres.

1987 Cultivated Cropland.
>4T<=5T Estimate = 63,700 acres.
>4T<=5T Error = 14,000 acres.

1987 Cultivated Cropland.
>5T Estimate = 65,100 acres.
>5T Error = 16,900 acres.

1987 Cultivated Cropland.
Total Estimate = 2,965,200 acres.
Total Error = 99,000 acres.

1992 Cultivated Cropland.

1992 Cultivated Cropland.
T=0 Estimate = 0 acres.
T=0 Error = 0 acres.

1992 Cultivated Cropland.
>0<=T Estimate = 1,905,800 acres.
>0<=T Error = 83,700 acres.

1992 Cultivated Cropland.
>T<=2T Estimate = 459,600 acres.
>T<=2T Error = 36,000 acres.

1992 Cultivated Cropland.
>2T<=3T Estimate = 227,500 acres.
>2T<=3T Error = 33,100 acres.

1992 Cultivated Cropland.
>3T<=4T Estimate = 82,500 acres.
>3T<=4T Error = 16,600 acres.

1992 Cultivated Cropland.
>4T<=5T Estimate = 57,500 acres.
>4T<=5T Error = 12,600 acres.

1992 Cultivated Cropland.
>5T Estimate = 48,300 acres.
>5T Error = 16,400 acres.

1992 Cultivated Cropland.
Total Estimate = 2,781,200 acres.
Total Error = 95,400 acres.

1997 Cultivated Cropland.

1997 Cultivated Cropland.
T=0 Estimate = 0 acres.
T=0 Error = 0 acres.

1997 Cultivated Cropland.
>0<=T Estimate = 1,822,100 acres.
>0<=T Error = 80,200 acres.

1997 Cultivated Cropland.
>T<=2T Estimate = 482,500 acres.
>T<=2T Error = 41,200 acres.

1997 Cultivated Cropland.
>2T<=3T Estimate = 203,100 acres.
>2T<=3T Error = 29,300 acres.

1997 Cultivated Cropland.
>3T<=4T Estimate = 92,900 acres.
>3T<=4T Error = 20,500 acres.

1997 Cultivated Cropland.
>4T<=5T Estimate = 51,000 acres.
>4T<=5T Error = 11,000 acres.

1997 Cultivated Cropland.
>5T Estimate = 25,200 acres.
>5T Error = 10,900 acres.

1997 Cultivated Cropland.
Total Estimate = 2,676,800 acres.
Total Error = 91,100 acres.

NOTE: Data may not add to totals because of rounding. The error referred to in the table is the standard error of the estimate. You can obtain the margin of error at the 95% confidence limit by multiplying the error by 1.96.

Standard errors greater than 50% of the estimate indicate a low level of statistical reliability.

The T=0 column indicates no USLE estimate was made or the USLE estimate is less than 0.005 (the database stores the USLE as two decimal places). For the purposes of this analysis, all acres in this category are assumed to be eroding below T.

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Last Modification: Friday, June 06, 2003

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