The Effects of Detention, Rilling, and Raindrop Impact on Runoff and Erosion

The purpose of this study was to determine how small amounts of mulch or plant residue effectively reduce erosion and runoff. The specific objectives were to evaluate the effects on runoff and erosion of (1) resistance to surface flow by known lineal lengths and uniform diameters of material (jute cord anchored with asphalt emulsion) adhered to the soil surface across the slope at uniform intervals to provide maximum resistance, (2) resistance to rill formation, without additional initial resistance to surface flow or raindrop impact, by treating narrow uniform strips of soil at uniform intervals across the slope with an asphalt emulsion, and (3) nearly eliminating raindrop impact energy by suspending a muslin mulch on a screen within a few inches of the soil surface. Small field plots and simulated rainfall were used in making the treatment comparisons. Advisor: Howard D. Wittmus