Abstract
The filtration of the red soil muddy water by filtration type basin of sedimentation soil is used as one of the red soil outflow prevention method in Okinawa Prefecture. This method is a main method widely used in many fields, because it is advantageous for workability and economical efficiency, if the site can be ensured. There are two problems on this method that the function of the filtration lowers by the transmission of red soil muddy water and the term which can ensure the filtration ability with the sufficient permeability is indefinite. The following are described in this study: Latest experimental result and design method of new filtration type basin of sedimentation soil capacity using the result.
