Health evaluation of Kedangpahu watershed in relation to flood problem at Kutai Barat Regency

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Research Paper 01/09/2018
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Health evaluation of Kedangpahu watershed in relation to flood problem at Kutai Barat Regency

Suparjo, Muhammad Sumaryono, Marjenah, Sigit Hardwinarto
J. Bio. Env. Sci.13( 3), 48-55, September 2018.
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Increasing occurrence of flood is one of the watershed degradation indicators. Since the causes of watershed degradation identified, restoration was one of the ways to return the balance of watershed ecosystem. Before it’s held, the first step that must be done was identifying watershed characteristics and health evaluation. Kedangpahu watershed is located in Kutai Barat Regency, East Kalimantan, covering 698.952 hectares area. The problems of this watershed were the increasing of flood frequency and its duration. The aim of the research was to justify Kedangpahu watershed health status. Method of study was using Geographic Information System (GIS). The first step of the study was identifying its bio-physic elements. The study showed that 63.19 % of total area had slightly slope. Average annual precipitation is between 826.9 – 3886,6 mm/year. High precipitation occurs on December, January, April and May. The water regime index, 2.34, is classified as in moderate category, meanwhile the average annual discharge tends to increase year by year. The dissolved sediment concentration is 31.75 mg/l. Some land cover areas were converted to palm oil plantation and mining. Based on land use planning map, 53 % of total areas are located at conversion area, in Indonesia called Areal Penggunaan Lain (APL). It can be concluded that Kedangpahu watershed health status is in moderate category.


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