ANALISIS DAMPAK TANGGUL TERHADAP ELEVASI BANJIR SUNGAI NAGARA KALIMANTAN SELATAN
ABSTRACT: Nagara River is a
river in South Kalimantan province with extensive swamp area which
formsseasonal flood plain and protects downstream area from flooding and salt
water intrusion. Theplan for land use change from the swamp area to plantation
area involves building dyke on thesides of Nagara River. This research aims to
analyze the elevation of Nagara River duringflooding when the swamp area is
occupied as an extension of flood plain, compared that resultedfrom the
scenario when this area is converted into plantation area which needs dyke on
the sidesof the river for flood protection. There are two kinds of scenarios,
first only one side of the riverwhich will be build dyke, and second both sides
of the river will be built dykes. The analysisinvolved rainfall data analysis
using daily module rainfall, design discharge analysis usingRational Method and
hydraulic analysis using HEC-RAS software with one-dimensional steadyflow. The
result shows that using dyke at elevation +11.00 m, the increase of water level
is notsignificant while one side of the river is protected by dyke. An increase
of 30 cm of water elevationis obtained using scenario of both sides are
protected by dykes. The increase of water level maycause flooding in the area
located at the upstream and downstream of the plantation area.
Penulis: Dyah Indriana
Kusumastuti
Kode Jurnal: jptsipildd110270
