Soil Erodibility
The maximum splash rate was set by Yamamoto et al.
(1973) as measure of erosion which was derived
from the cumulative splash out curves. Splash out rate was
maximum for most soil groups during
the first 3 min. It then declined steadily
to the end of the rests. A hard crust like layer formed on the surface
of most of the soils tested. This later resisted detachment and reduced the
infiltration rate. The slopes of the cumulative curves for the ash soils
(groups C and D) and for the humic ferruginous latosol (group F) are distinctly
steeper than those for the other groups throughout the whole period of rainfall
exposure. The curves suggest that the Waianae soils of groups F, G, and H
have higher early splash out rates than Koolau soils of grous A, B and E.
This difference means that when they are exposed, Waianae soils (with the
exception of Koolau ask soils) would be the most susceptible to erosion from
short-duration, high-intensity rainfall.
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