| A new type of douche was developed,having the characteristic of low flow peak and low cost,which broke blockade sensitive size of douche bore diameter less than 0.7 mm,and reduced douche blockade problem efficaciously.Through developing the research of sands underground irrigation experiment,irrigation method of paving 35 cm×35 cm water proof membrane under the douche was put forward,also underground irrigation technique was applied in sands,which provided guarantee to harness and utilize sands resources. |