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Moh Sholichin
Brawijaya University
Earth & Planetary Sciences Engineering

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Analisa Pendugaan Laju Erosi Dengan Menggunakan Model Agricultural Non Point Source Pollution (AGNPS) di Sub Das Lesti Kabupaten Malang Muhammad Fariz Kasyful Haq; Moh Sholichin; Runi Asmaranto
Jurnal Teknologi dan Rekayasa Sumber Daya Air Vol. 1 No. 1 (2021): Jurnal Teknologi dan Rekayasa Sumber Daya Air (JTRESDA)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jtresda.2021.001.01.16

Abstract

Changes in landuse and the topographic are undulating and hilly with a slope of 8-45%, as well as the intensity of precipitation impacts on increased erosion rates in sub-watershed Lesti area. Continuous erosion of land causes shallows rivers in Sub-watershed Lesti. An analysis and mapping of the greater existential rates on erosion and sedimentation along with the erosion of sub-watershed Lesti as well as land conservation efforts to reduce the effects of such erosion.Calculations using a model Agricultural Non-Point Source Pollution (AGNPS) obtained an average watershed erosion rate of 163,119 tons / ha / year. The results analysis of the danger erosion levels and area based on erosion danger index by hammer (1981) is obtained with a low level index (<1) 13,770 km2, a moderate level (index 1-4) 13,521 km2, a high level (index 4-10) 14,623 km2, and an exorbitant level (index >10) 16,342 km2. Based on sediment delivery ratio (SDR), results of sediment are 144,820.54 tons / year or 120,683.96 m3 / year. The conservation of land to reduce the rate of erosion are carried out in several ways, either by using vegetative and  mechanical methods.
Studi Peningkatan Usia Guna Waduk Songputri Akibat Dampak Sedimentasi Sris Novita Emiliawati; Moh Sholichin; Riyanto Haribowo
Jurnal Teknologi dan Rekayasa Sumber Daya Air Vol. 2 No. 2 (2022): Jurnal Teknologi dan Rekayasa Sumber Daya Air (JTRESDA)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jtresda.2022.002.02.21

Abstract

Songputri Reservoir located in Wonogiri Regency which was built in 1977-1984 needs to be handled such as vegetation, checkdam construction, and dredging to find out how much additional the reservoir's useful life, besides that it is also necessary to calculate the erosion and sedimentation in the Songputri watershed. The data needed is monthly rainfall data, number of rainy days, and maximum daily data used to calculate the value of erosivity (R), a soil type map to determine the erodibility value (K), a slope map to determine the LS factor, and a land use map to determine the CP value. The calculations will using USLE method assisted by the ArcMap 10.4 application. From the results, it is known that the erosion is 23,157.57 tons/year, the sedimentation is 1,976.71 tons/year, and the reservoir useful life is 22 years. After that, reforestation is carried out on an area of 14.28 ha, construction of 6 checkdams, and dredging in the Songputri Reservoir. After that, the erosion and sedimentation were calculated using the same formula, it is known that the erosion is 7,735.39 tons/year, the sedimentation is 660.29 tons/year, and the useful life of the reservoir is increased to 67 years
Co-Authors Muhammad Fariz Kasyful Haq Riyanto Haribowo Runi Asmaranto Sris Novita Emiliawati