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Yulyana Aurdin

Indo Global Mandiri University

Author-ID : 2749583

Civil Engineering, Building, Construction & Architecture

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PENGARUH PERUBAHAN TATAGUNA LAHAN TERHADAP KARAKTERISTIK HIDROGRAF BANJIR (Studi Kasus DAS Dengkeng dan DAS Jlantah Bagian Hulu Bengawan Solo Kabupaten Sukoharjo, Provinsi Jawa Tengah) Yulyana Aurdin
Jurnal Tekno Global Vol 3, No 1
Publisher : UNIVERSITAS INDO GLOBAL MANDIRI

The flood event on December 26, 2007, in Bengawan Solo river, the Province of Jawa Tengah has caused loss and submerged housed of thousands of people. The growing issue in regard to the event indicated that the cause was the changing response of the catchment area to the rainfall due to the land use changing. The changing of the hydrograph shape and the amount of peak discharge can be interpreted as the form of land use changing consequences. Thus, it is required to have a hydrological analysis to identify the changing of peak discharge due to the impact of land use changing. In this study, hydrological analysis was carried out for Dengkeng and Jlantah watershed as the critical catchment areas. The method used for the analysis was calculating unit hydrograph by using the Collins method in the conversion process of rainfall-runoff translation, calculating the effective rainfall by using the Soil Conservation Service-Curve Number (SCS-CN) and calculating the design flood with return periods of 2, 5, 10, 25, and 50 years by using the frequency analysis method. The design flood calculation was carried out for various land use conditions. Results of this study showed that the CN value as the main variable of the land function in Dengkeng and Jlantah watershed from 2003 to 2009 has not indicated significant improvement changes. Therefore, in order to rehabilitate forest and critical land as well as to optimally improve the development of the catchment areas in the future land use control is necessary. Based on the plans by BPDAS Solo, the results indicated that such rehabilitation influenced the changing of CN value and the losses factor as well as to the effective rain in rainfall-runoff translation. This was indicated by the declining flood peak discharge in 2025 from 18% to 66%.

ANALISIS MULTIKRITERIA UNTUK MEMETAKAN DAERAH RENTAN BANJIR PADA SUB DAS BUAH, PALEMBANG Sartika Nisumanti; Yulyana Aurdin
Jurnal Tekno Global Vol 2, No 1
Publisher : UNIVERSITAS INDO GLOBAL MANDIRI

Flooding is a serious problem for last time that hit several regions in Indonesia, either urban or rural areas. Palembang city suffered a loss of nearly 1.5 billion dollars per year, due to damage to public infrastructure and households, especially in low lying areas, such as Bendung watershed, Buah watershed, and Lambidaro watershed (Putranto and Popy, 2009, Hamiem, 2012). Almost 52% of the area of Palembang City is a swamp area with some type of swamp, marsh are flooded throughout the year, shortly stagnant swamp when it rains, flooded swamps and tidal current occurs. To map areas vulnerable to inundation or flooding in the sub watershed system, the analysis needs to be performed using a multi criteria approach of some of the parameters that affect flooding. For the analysis problem in susceptible areas to flooding in the Buah subwatershed. The results of this study showed that the inundation height of 20-40 cmand a pool of up to 3 hours long. Location inundation accurred in Jalan Urip Sumoharjo close to residential Ajendam, Kenten Permai, SMU Bina Warga, Rama Kasih, Griya Sekojo and mosque of Arafura. Results of Multi-Criteria analysis to show the distribution of vulnerable runoff coefficient of 0.7, which means rainfall that falls to just 30% Buah Watershed whereas infiltered into the runoff by 70%.Keywords : Multi-spatial, Flood, DUFLOW, early warning

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