The Enhancement of Water Retaining Capacity in NCKU Campus by using Low Impact Development Method

Kun Jhang

This study takes the NCKU Campus as an example, the drainage system of the study area was modeled by using Sponge City Aided Design (SCAD). Based on analysis and planning of different types of land use and the drainage system of Cheng Kung Campus, to determine the appropriate water conservancy facilities, which can improve water retaining capacity on the campus. According to 80% of the total annual runoff control rate, a comprehensive comparison of various options in the water conservation effect and the pros and cons of construction has been discussed. To set up grass marsh zone and bioretention on the campus is an optimal solution, which is easy to construct and also can significantly alleviate the urban flooding on the campus. The reduction rate of total runoff is 43.9%, and is one of the feasible and efficient schemes for future school drainage planning.

Key words: Low Impact Development, Urban Flood, SCAD, flood retention method