Contouring relates to the direction of the tillage (ridges and furrows) with respect to the land slope.
Traveling around the slope such that the ridges are on the contour can significantly reduce soil loss for moderate slopes.
Cross slope farming is going at an angle to the direction of the land slope that is between being on the contour and up and down hill.
Cross slope farming reduces soil loss some but not nearly as much as contouring.
Strips and barriers slows runoff, reduce its transport capacity, and produce deposition.
Strips/barriers spread the runoff, reducing its erosivity.
Many type strips/barriers are used depending on land use.
Terraces/diversions are ridges-channels placed on the hillslope to intercept runoff.
In effect, terraces/diversions shorten slope length.
Terraces are channels on such flat grades that deposition occurs in them because transport capacity is less than incoming sediment load, provided the grade of the terrace channel is sufficient flat.
Diversions are design with a grade sufficiently steep that deposition doesn’t occur and with a grade sufficiently flat that erosion doesn’t occur.
Impoundments trap and retain runoff, giving sediment time to settle and be deposited.
Discharge for small basins can be discharged to an underground tile line thus eliminating concentrated flow at that point.
Storage of runoff in impoundments reduce flow rate, and thus reduce concentrated flow erosion.