Urban storm-water special planning method based on the theory of a “storm-water management unit”

Abstract

Recently, urban waterlogging issue has become a big challenge for the sustainable development of a city and the method of urban planning and design. As a basis to the knowledge of LID (low impact development) theory and water supply and sewerage planning, this article investigates the reasons for urban waterlogging deeply, puts forward the concept of a “storm-water management unit” and its corresponding theory, and summarizes the methods of urban stormwater special planning as follows: 1) Environmental carrying capacity assessment in storm-water; 2) Estimation of total quantity of the urban rainfall runoff; 3) Establish the target of the storm-water drainage; 4) Divide the “stormwater management unit”; 5) Set the control index of storm-water drainage; 6) Choose the LID practices. The method of storm-water special planning will establish a theoretical foundation for the sustainable development of the city.