ANALISA TINGKAT BAHAYA EROSI PADA SUB DAS LESTI KABUPATEN MALANG MENGGUNAKAN SISTEM INFORMASI GEOGRAFIS

Abstract

Ernawan Setyono1& Bangkit Prasetyo2

1&2Fakultas Teknik Jurusan Teknik Sipil Universitas Muhammadiyah Malang
Alamat Korespondensi : Jl. Raya Tlogomas, No.246 Malang
email :ernawan@umm.ac.id , Telp 03419591639

ABSTRACT

Sub DAS Lesti is a part of Brantas watershed that located at upstream section and a sub DAS
priority. That has 61.491,02 ha of water catchment areas. Hydrological processes that occur in a
watershed is closely related to erosion. The alteration of land use and watershed management is one
of the factors causing soil damage, accelerate the erosion rate, and cause erosion. Based on the
condition of that case, this study analyzes about how much the erosion rate, the amount of erosion,
and to estimate the level of erosion that will occur.
MUSLE method is one of the methods used to determine the magnitude of the erosion rate,
that use an approach of runoff factor. Geographic Information Systems (GIS) used for the management
and data processing. Geographic Information Systems is a spatially information technology that
generate digital data which can gives the area characteristics, and illustrates the potential of soil
damage.
The level of erosion hazard on Sub DAS Lesti for weight categories reach 31.421% of the
area, while another erosion rate is Medium 24.146%, Lightweight 22.151%, Very Heavy 16.123%,
and Very Light 6.159%.