The ecological and social requirements must be taken into account in the design of flood drainage channel,which was an important part of urban water environment.

Based on the said characteristics in modern urban areas, a rational formulae is hereby proposed, in which, the peak flow in the urban flood-relief channel is com.

According to the general layout principles of adapted to local conditions, economical use of land, site safety and environmental protection, the planning and design for inside and outside road, aggregate mining and transportation, residue field, construction site, construction facilities and flood prevention and drainage are carried out.