Ganjiagou is one of the famous debris flow disastrous gully in China. The catchment area is 24. 3km￣2.There are52 landslides and 1 3.4 13 × 10￣7m￣3 loosened solid material in the gully.The formation condition of debris flow is extrernely advantageous

In order to protect the farmland villages and towns

roads and Wudu city in upper reach

onecomprehensive prevention countermeasures has been put forwards according to formation features and disastersforms of debris flow

which is to combine the engineering and biological measures

to take engineering measure asthe domirant factor and to combine the regulating and drainly measures

taking regulating measure as the domirantfactor。