Cross-Drain Spacing -- Sediment Yield Program

Road Width Explanation


Road design What to use
Flat travel-way Enter width of travel-way.
Insloping road; no ditch treatment; no ruts Enter sum of width of travel-way and inside ditch width.
Insloping road; rocked or graveled ditch; no ruts Enter width of travel-way; read output for 10-m (33-ft) drain spacing.
Outsloping road; no ruts Enter width of travel-way; read output for 10-m (33-ft) drain spacing.
Outsloping road; rutted Enter width of travel-way.
None of the above Run WEPP or WEPP:Road.


X-DRAIN 2.000
USDA Forest Service Rocky Mountain Research Station