Retardance
for Up and Downhill
ØRUSLE2 chooses retardance based on row spacing and the retardance selected for a strip of the vegetation on the contour
-How does vegetation
slow the runoff?
ØRow spacing
-Vegetation on ridge-no
retardance effect
-Wide row-no retardance
effect (> 30 inches spacing)
-No rows,
broadcast-same as strip on contour
-Narrow row-small grain
in about 7 inch spacing
-Very narrow-same as
narrow row except leaves lay
in row middle to slow runoff
-Moderate-about 15 to
20 inches spacing