Equations which relate sediment delivery to a power function of flow rate and slope gradient were
evaluated in this study. The data used to parameterize the equations were obtained from sites where crop
residues had been removed, and moldboard plowing and disking had occurred. Measurements of sediment
delivery resulting from simulated rainfall were obtained from preformed rills and interrill areas. The
equations provided reliable sediment delivery estimates for selected soils located throughout the United
States. To use the sediment delivery equations, soil-related parameter values must be identified. Multiple
regression analyses were performed to relate parameter values used in the equations to selected soil
properties. Equations were also developed for estimating rill sediment delivery under rainfall conditions
from rill soil loss and discharge data collected without the addition of rainfall. The equations identified in
this study, and appropriate soils information, can be used to predict sediment delivery on both rill and
interrill areas
