Kajian Geomorfologi, Bahaya Dan Risiko Banjir, Serta Aplikasinya Untuk Evaluasi Tata Ruang Kota Sintang

Abstract

The Sintang City, located in West Borneo, is annually inundated by flood during rainy season. The city itself is growing in the Y-junction of two big rivers i.e. Kapuas and Melawi, or geomorphologically growing on the major floodplain/alluvial plain of those rivers. Once, flood disaster has occured several days in 1963, inundating most of settlements and there were many of victims and damages. Although in the last recent days the floods were moderate, but such big event could be repeated in the future time. For reducing such disaster, flood study and mitigation program should be performed. The aims of this research are (1) to analyses and to map flood hazard and risk zones and (2) to evaluate the Sintang's land use planning (RDTR) based on flood hazard. Geomorphological approach is used for analyzing flood hazard based on morphogenesis and morphology parameters and history of floods. Vulnerability (based on actual land use) and flood hazard maps are then used for analyzing flood risk. Scoring for geomorphological and land use parameters and GIS spatial overlay is used for assessing hazard, risk, and evaluation of RDTR. The result shows that 95% of study area is composed of fluvial landforms, whereas flood hazard assessment indicates that 0.80% of Sintang's area is classified as very low of hazard, 57.2% low, 31.5% moderate, and 10.5% high. As for the risk assessment based on hazard and vulnerability, it shows that 0.90% of city's area has very low risk, 70.1% low, 22.5% moderate, and 6.50% high. These two later classes almost cover one-third of developed areas, such as residential, office, and commercial areas. The evaluation of RDTR based on flood hazard demonstrating thatalmost half of RDTR's developped areas (44.4%) is clasified as moderate risk zone and 4.10% as high risk zone. It indicates that flood mitigation program should be placed on high priority by Government for reducing the risk.

Analisis Potensi Banjir di Kota Denpasar Menggunakan Metode Analytical Hierarchy Process

“…1. Analisis Kebutuhan Sistem Pada tahap ini dilakukan analisis terhadap kebutuhan sistem didalam merancang sistem perhitungan potensi rawan banjir di kota denpasar dengan menghitung data kejadian bencana [8], data daerah rawan banjir dan data cuaca menggunakan metode AHP.…”

Peak Discharge in Jemelak Subwatershed, Sintang District

“…In detail, this catchment area is mostly located in Sintang Sub District, the center of the Sintang District government. The floods that may appear caused not only victims and damages but also disrupted government activities (Pramulya et al 2011).…”