Underground Drainage can be divided into underground level and vertical drainage,waterlogged removal and regulating soaking,but the ground drainage only drains flood,can t drain waterlogged by the earthsurface accumulated water,it is finished by underground drainage.

Persistence of comprehensive treatment and enhancement of waterlog control criteria;

At last itindicates measures to integrate the vertical plan andwaterlog prevention including pre-retaining channel forwater from high altitude outwards to the river, construct-ing flood drainage station at key sites, river systemimprovement, protection for city water surface andswamp.

The reasonable water surface ratio in the plain river network area is analyzed according to the basic functions such as flood prevention and drainage waterlogging and water resources use factor born in the water basin.