The effect of urbanization on precipitation excess in Thi Tinh Basin

Abstract

Thi Tinh Basin is one of fastest developing area. The urbanization is cause of land use change, which leading the reducing of abtraction and increating of the precipitation excess. The increase of precipitation excess due to urbanization will influence on the urban drainage systems. The purpose of this paper is study of the effect of urbanization on the precipitation excess in Thi Tinh Basin, from 1989 to 2014 and masterplan to 2020. The Method used for these study is SCS Curve Number Loss Model, with landuse data were performed from Landsat Images. The study results show a remarkable increase in the precipitation excess. From 1989 to 2014, precipitation excess was increased 12,9% on the Thi Tinh Basin. On the masterplan to 2020, the accumulated precipitation excess is rather high, for the 180 minutes design hyetograph with period of 10 years repeated, it is from 66,3mm to 94,9mm on the Basin.