PRACTICE TERRACE (Ft.) 600 DEFINITION slope length used when checking soil loss for a proposed terrace spacing is the distance from An earth embankment, or a combination ridge the terrace ridge to the next lower terrace and channel, constructed across the field channel measured along the natural flow slope. direction. Maximum spacing for erosion control based on soil loss tolerance may be PURPOSE increased by as much as 10 percent to provide better location, alignment to accommodate This practice is applied as part of a resource farm machinery or to reach a satisfactory management system for one or more of the outlet. following purposes: The methods that may be used to determine Reduce erosion and trap sediment terrace spacing include the current NRCS Retain runoff for moisture conservation accepted erosion prediction technology, the Vertical Interval Equation or state-developed CONDITIONS WHERE APPLIES methods address unique soil, cropping or other farming practices that affect terrace This practice applies where: spacing. Refer to the current NRCS accepted Soil erosion caused by water and erosion prediction software and user guide to excessive slope length is a problem determine soil loss. Excess runoff is a problem There is a need to conserve water The soils and topography are such that terraces can be constructed and reasonably farmed A suitable outlet can be provided CRITERIA General Criteria Applicable to All Purposes Spacing. Space terraces at intervals across the slope to achieve the intended purpose. The maximum spacing of terraces for erosion control the soil loss tolerance (T) or other soil loss criteria that is documented in the Field Office Technical Guide. Include both the terrace system with planned as-built slopes and cultural practices such as residue management when determining soil loss. The
TERRACE (Ft.) 600 DEFINITION An earth embankment, or a combination ridge and channel, constructed across the field slope. PURPOSE This practice is applied as part of a resource management system for one or more of the following purposes: Reduce erosion and trap sediment Retain runoff for moisture conservation CONDITIONS WHERE PRACTICE APPLIES This practice applies where: Soil erosion caused by water and excessive slope length is a problem Excess runoff is a problem There is a need to conserve water The soils and topography are such that terraces can be constructed and reasonably farmed A suitable outlet can be provided CRITERIA General Criteria Applicable to All Purposes Spacing. Space terraces at intervals across the slope to achieve the intended purpose. The maximum spacing of terraces for erosion control the soil loss tolerance (T) or other soil loss criteria that is documented in the Field Office Technical Guide. Include both the terrace system with planned as-built slopes and cultural practices such as residue management when determining soil loss. The slope length used when checking soil loss for a proposed terrace spacing is the distance from the terrace ridge to the next lower terrace channel measured along the natural flow direction. Maximum spacing for erosion control based on soil loss tolerance may be increased by as much as 10 percent to provide better location, alignment to accommodate farm machinery or to reach a satisfactory outlet. The methods that may be used to determine terrace spacing include the current NRCS accepted erosion prediction technology, the Vertical Interval Equation or state-developed methods address unique soil, cropping or other farming practices that affect terrace spacing. Refer to the current NRCS accepted erosion prediction software and user guide to determine soil loss.
DraftCO600std.docx