RUSLE2 vs RUSLE1 - USDA€¦ · RUSLE2 is an entirely is an entirely Windows Based Environment No...
Transcript of RUSLE2 vs RUSLE1 - USDA€¦ · RUSLE2 is an entirely is an entirely Windows Based Environment No...
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RUSLE2RUSLE2 vs.vs. RUSLE1RUSLE1
DifferencesDifferences
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RUSLE1RUSLE1 DOS Based WorksheetDOS Based WorksheetData from look up tables
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RUSLE1RUSLE1 DOS Based WorksheetDOS Based Worksheet
• You had to look up lots of data from tablesto enter into the worksheet, including:
– R Factor (rainfall factor) – C Factor (cropping factor) – K Factor (erodibility of the soil) – P Factor (supporting practices)
– Following slides show the old look-up tables…
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RUSLE1RUSLE1 DOS Based WorksheetDOS Based Worksheet
• You entered slope length and percent into the worksheet, and the program would calculate LS (length/slope) factor, and the estimated soil erosion rate (average tons/acre/year) based on the data entered (A).
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RUSLE1RUSLE1 DOS Based WorksheetDOS Based WorksheetComputer Generated Numbers
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RUSLE2RUSLE2 is an entirelyis an entirely Windows Based EnvironmentWindows Based Environment
No More HardNo More Hard--Copy Look Up Tables!Copy Look Up Tables!
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RUSLE2RUSLE2 HistoricalHistorical¾USLE - developed in 1950’s ¾RUSLE1 started in 1985 ¾RUSLE1 released in 1993 ¾RUSLE2 started in 1998 ¾Is a Major revision of RUSLE1 ¾Most RUSLE1 relationships are revised ¾All calculations in RUSLE2 are made within a
computer environment. ¾RUSLE2 contains a new graphical interface
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Validation of RUSLE2Validation of RUSLE2¾ 10,000 plot-years of data from natural runoff
plots ¾ 2000 plot-years of rainfall simulator data ¾ Proven by more than 4 decades of worldwide
use by its predecessors, USLE and RUSLE1 ¾ Developed & tested by experienced and
nationally recognized erosion scientists andconservationists.
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RUSLE2 FACTORSRUSLE2 FACTORSDaily Soil LossDaily Soil Lossa = r k l s c pa = r k l s c p
• r- erosivity factor - rainfall/runoff • k- soil erodibility factor • l- slope length factor • s- slope steepness factor • c- cover-management factor • p- supporting practices factor
Average annual soil loss = sum of daily soil loss values Different formulation from USLE and RUSLE1