The original pre-cast bamboo face slabs for the earth canal of Nan er Hydropower Station were destroyed seriously and have lost its function of seepage control.

A large number of earth canals in the countryside attract Chinese central authorities and local governments great attention for its agricultural development.

n the basis of preflooding tests of gravity-wet sinking loess canal beds,the paper discussed the impacts of the canal-bed section size on the wet-sink rate and magnitude,the relation between the sinking magnitude.