Terraces
ØRidges and channels periodically placed along hillslope that divides hillslope into shorter slope lengths except for widely spaced parallel terraces that may have not effect on slope length
ØBenefit:
-Shorten slope length and trap sediment
-Runoff management system
ØEvenly spaced
-May or may have a terrace at bottom
ØMaintenance required to deal with deposition
n
RUSLE2 assumes that terraces are equally spaced on the hillslope.
A terrace may or may not be bottom of slope.
A terrace at bottom of slope reduces sediment yield.
Parallel terraces do not shorten slope length as much as gradient terrace.
Special consideration should be given to how wide parallel terraces affect slope length.
Parallel terraces usually include an impoundment placed in concentrated flow area that parallel terraces cross.
Other benefits besides interrill-rill erosion control.