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TIPOLOGI DAERAH ALIRAN SUNGAI UNTUK MITIGASI BENCANA BANJIR DI DAERAH ALIRAN SUNGAI MUSI Irfan Budi Pramono; Pamungkas Buana Putra
Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Management Research) Vol 1, No 2 (2017): Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Managem
Publisher : Center for Implementation of Standards for Environmental and Forestry Instruments Solo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (953.511 KB) | DOI: 10.20886/jppdas.2017.1.2.143-165

Abstract

The cause of flood problems could be identified from problems that happened in the  catchment area as flood water discharge and flooded  or inundation area. The objective of this study is to identify the degree of flood vulnerability, both flood water discharge and flooded area, as a basis of flood mitigation at the Musi Watershed. Method applied on this study is the watershed typology formula developed by Watershed Management Technology Centre (WMTC) for identifying flood vulnerability based on land system, land cover, and maximum daily rainfall. Degree of flood vulnerability is differentiated into five categories. Musi Watershed was divided into 14 sub watersheds and each sub watershed is identified its degree of vulnerability on flood water discharge and area of flooded area. Based on these values the rank of sub watershed to its degree of degradation could be generated. The result showed that Komering and Deras Sub Watersheds were vulnerable to flood due to their nature. Ogan and Upper Musi Sub watersheds were the source of flood due to different caused by high rainfall, while Upper Musi was generated by high land vulnerable. The mitigation program in the flood prone area is complicated since Deras Sub Watershed was the accumulation of many downstream sub watersheds. Mitigation program in the discharge area could be done in Upper Musi Sub Watershed, since it has the highest vulnerability. Upper Musi is also the upstream of Deras Sub Watershed.
EVALUASI LAHAN UNTUK MENILAI KINERJA SUB DAERAH ALIRAN SUNGAI RAWAKAWUK (Land evaluation to assess performance of Rawakawuk Sub Watershed) Nining Wahyuningrum; Pamungkas Buana Putra
Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Management Research) Vol 2, No 1 (2018): Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Managem
Publisher : Center for Implementation of Standards for Environmental and Forestry Instruments Solo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1073.711 KB) | DOI: 10.20886/jppdas.2018.2.1.1-16

Abstract

ABSTRACTLand is an important resource in a watershed because of its position as a processor. The condition of a watershed depends on the land management and its compliance with its performance. The purpose of the research is to evaluate the performance of Rawakawuk Sub Watershed from the land aspects. Guidelines of Watershed Evaluation and Monitoring, i.e. the Regulation of Director General of Land Rehabilitation and Social Forestry or PerDirjen 04/V-Set/2009 was used to analyze parameters of Vegetation Cover Index (VCI), Land Use Suitability Index (LUSI), and Erosion Index (EI). The results showed that the study area has 53% of pine and teak monoculture, and 20.7% of agroforestry private forest, therefore the VCI is 73.2%. The LUSI is 93.7% which implies that 93.7% of the area is suitable to its land capability. In addition, 36.1% of the area is exposed to very severe erosion. Since the solum depth is relatively deep (>90 cm), the tolerable soil erosion is high and EI tends to be small. Around 60.3% of the area has an average EI of 71.1 which is classified as moderate. Based on the cumulative value of VCI, LUSI and EI, Rawakawuk Sub Watershed can be classified as slightly good. However, conservation practices should be applied to the very severe erosion areas. Keywords: watershed; forest; degradation; performance; permanent vegetation ABSTRAKLahan merupakan sumber daya penting dalam pengelolaan Daerah Aliran Sungai (DAS) karena kedudukannya sebagai prosesor. Baik buruknya suatu DAS tergantung kepada pengelolaan dan kesesuaian lahan dengan daya dukungnya. Tujuan penelitian ini adalah melakukan evaluasi kinerja Sub DAS Rawakawuk dari aspek lahan. Analisis dilakukan dengan menggunakan Pedoman Monitoring Evaluasi DAS, Peraturan Direktur Jenderal Rehabilitasi Lahan dan Perhutanan Sosial Nomor 04/V-Set/2009 dengan parameter: Indeks Penutupan Vegetasi (IPV), Indeks Kesesuaian Penggunaan Lahan (IKPL), dan Indeks Erosi (IE). Hasil analisis menunjukkan bahwa di sub DAS tersebut 53% merupakan hutan produksi pinus dan jati berpola monokultur dan 20,7% hutan rakyat berpola agroforestri dengan nilai IPL 73,2%, nilai IKPL 93,7% yang menunjukkan 93,7% lahan sesuai dengan kelas kemampuannya. Berdasarkan perhitungan erosi, 36,1 % area memiliki tingkat erosi sangat berat (SB), namun kondisi solum tanah yang tebal (>90 cm) mengakibatkan nilai erosi yang diperkenankan juga tinggi, sehingga nilai indeks erosi cenderung kecil. Pada 60,3% lahan Sub DAS Rawakawuk memiliki indeks erosi rata-rata sebesar 71,1% yang termasuk pada kategori sedang. Berdasarkan nilai kumulatif IPL, IKPL dan IE disimpulkan bahwa lahan Sub DAS Rawakawuk mempunyai kinerja dalam kategori agak baik, namun perlu penerapan konservasi tanah pada beberapa lokasi dengan kelas erosi sangat berat.Kata Kunci: DAS; hutan; degradasi; daya dukung; vegetasi permanen
Co-Authors Irfan Budi Pramono Nining Wahyuningrum