Urban green tree morphology and the problem of minimizing runoff. A case study in Ly Thuong Kiet Street, Hue City, Vietnam.

Abstract

Abstract Sustainable urban drainage by green infrastructure is emphasized. Trees can change the three processes of interception, evapotranspiration, and infiltration of the hydrological cycle, so they are considered one of the effective solutions to reduce urban flooding. The article applies Minnesota’s Minimum Impact Design Standards (MIDS) Calculator method to compare the ability to reduce surface runoff of urban trees on Ly Thuong Kiet Street before 2009 and 2022. The calculation results show that before 2009 it was 3,406m3; after expanding the road and replacing the type of greenery, it was only 1,570m3 in 2022, a decrease of 2.16 times compared to before 2009. The factors that create the difference are canopy area (CP), leaf area index (LAI), tree species, and soil volume for each tree. The decrease in this ability is due to the greenery replaced after 2010 being unsuitable for local characteristics, so the trees are poorly developed or dead.