Submitted to: International Symposium on Preferential Flow
Publication Type: Proceedings
Publication Acceptance Date: 11/29/2001
Publication Date: 12/20/2001
Technical Abstract: Macropores contribute to the rapid movement of water and solutes through the soil. Rawls et. al. (1993) developed methods based on fractal geometry for estimating the macropore saturated hydraulic conductivity for no-till soils. These procedures required a measured areal macroporosity, or a measured areal macroporosity and a measured radius of the largest macropore. The objective of this study was to test these procedures on montmorillonitic clay soils. The soil survey macroporosity classes were highly correlated with the measured macroporosity. The equation for predicting macroporosity based on the largest macropore radius gave poor results. The macropore saturated hydraulic conductivity prediction equations based on a measured macroporosity and the radius of the largest macropore gave good results; however, the constant had to be reduced by about a factor of 10.