Rainfall Analysis in Flood Prone Areas in Binjai City
Sarra Rahmadani1, Rumilla Harahap2, Ahmad Zulfikar3, Menna Fadillia4

Universitas Negeri Medan

Abstract

High rainfall is one of the factors that often cause flooding, mainly if the drainage does not function optimally in an area. So it is necessary to analyze precipitation to know the maximum rain in a place to be considered in a drainage plan. The flood-prone area to be analyzed is Binjai City on Jalan Soekarno Hatta with frequency analysis methods: (1) normal distribution, (2) normal log distribution, (3) log person III, and (4) Gumbel. The analysis used 18 years of rainfall data with a return period of 50 years. The results obtained were (1) Normal 1017.857 mm, (2) normal log distribution 917.211 mm, (3) log person III 763.160 mm, (4) Gumbel 1412.4255 mm. From these results, the frequency analysis of the Gumbel method, which has the most extreme value, this data can be used for further study to obtain the results of rainfall intensity values, which can later be used as supporting data for drainage planning for the Soekarno Hatta area, Binjai City.

Keywords: Rainfall, Frequency Analysis, Binjai City

Topic: Applied Sciences-Computers and Engineering