Drain opening position are considered in the choice of two principles:
one is reclaimed wastewater on surrounding environment pollution; The
second is reclaimed sand erosion; On the basis of the above two principles,
in the appropriate position setting temporary water flow sand cofferdam,
hydraulic fill of S type circulation of water, the sediment precipitation has a
longer period of time , make the outside of the reclaimed water reached the
requirements of environmental protection, but also reduce the loss of the
reclaimed sand .