ANALISIS PENANGANAN GENANGAN PADA WILAYAH KOTA BANJARMASIN

SOLIKIN SOLIKIN, Ery Suhartanto, Riyanto Haribowo

Abstract


ABSTRAK: Hujan seringkali mengakibatkan genangan di wilayah Banjarmasin. Hujan 30 Maret 2016, mengakibatkan genangan (tinggi ±8-60 cm) di Satuan Wilayah Penanganan Genangan (SWPG) Sudi Mampir. Tujuan penelitian ini mengkaji kapasitas drainase eksisting dan pengaruh pasang Sungai Martapura. Hujan rancangan dihitung dengan Log Pearson III. Debit banjir saluran drainase dihitung dengan Metode Rasional. Perhitungan debit banjir Sungai Martapura digunakan Metode HSS Nakayasu. Pemodelan profil aliran sungai dengan HEC-RAS v5.01. Perhitungan back water pada S. Telawang dengan Metode Tahapan Langsung. Hasil analisis, hujan yang terjadi sebesar 138 mm setara R32tahun. Terdapat 35 saluran tidak memadai di SWPG. Volume genangan akibat hujan di SWPG sebesar 54.470,07 m3, dengan tinggi rerata di lahan 10.3 cm dan 47 cm di jalan. Debit Sungai Martapura saat kejadian setara Q2tahun (566.54 m3/dtk). Volume dan luas genangan akibat luapan sungai di SWPG 2.216,68 m3 dan 11.093,26 m2. Tinggi rerata genangan di kawasan sekitar sungai ±20 cm.

Kata kunci: Drainase, Genangan, Back Water, Pasang Surut, Polder

ABSTRACT: The rainfall often cause inundation in the area of Banjarmasin. Rainfall on March 30, 2016, cause inundation (high ± 8-60 cm) in SWPG Sudi Mampir. The purpose of this study to examine the capacity of the existing drainage and tidal influence of Martapura River. Maximum Rainfall with certain return period calculated by Log Pearson III. Maximum Discharge in drainage channels are calculated with Rational Method. Martapura River flood discharge calculation used Nakayasu HSS Method. Modeling of river flow profile with HEC-RAS v5.01. Calculation of back water in Telawang River used Direct Step Method. The results of the analysis, the rainfall that occurred at 138 mm equivalent R32tahun. There are 35 channels in SWPG inadequate. Volume of inundation rainfall in SWPG is 54470.07 m3, with a mean height in the land 10.3 cm and 47 cm on the roads. Discharge of Martapura river at the time equivalent Q2tahun (566.54 m3/sec). Volume and area of inundation due overflow of Martapura Rivers in SWPG is 2216.68 m3 and 11093.26 m2. High average inundation in the area around the Martapura River is ± 20 cm.

Key words: Drainage, Inundation, Back Water, Tidal, Polder


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