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Analysis of Recent Erosion Hazard Levels and Conservation Policy Recommendations for Lesti Subwatershed, Upper Brantas Watershed Andi Setyo Pambudi; Setyo Sarwanto Moersidik; Mahawan Karuniasa
Jurnal Perencanaan Pembangunan: The Indonesian Journal of Development Planning Vol. 5 No. 1 (2021): April 2021
Publisher : Ministry of National Development Planning Republic of Indonesia/Bappenas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36574/jpp.v5i1.167

Abstract

The reduced age function of Sengguruh Dam/Reservoir due to erosion in the upper of Brantas Watershed (Lesti Subwatershed area) interferes with its role in flood control, irrigation water supply and the supply of most of the hydroelectricity in East Java Province, Indonesia. This study aims to estimate erosion, analyze the interrelationship of the causative factors and provides environmental conservation direction. The research method uses mixed methods. The quantitative method of erosion rates is done by calculating the Modify Universal Soil Loss Equation which is supported by GIS tools. The qualitative method is carried out with questionnaires and interviews in the Lesti Subwatershed area. The results showed that the current erosion rate in each ha of land (average) in the Lesti Subwatershed was 153,868 tons / ha / year (exceeding the tolerable erosion rate of 30 tons / ha / year). The rate of erosion in the Lesti Subwatershed has always increased in the last 14 years. Of the 12 Subdistricts in the Lesti watershed, as many as 6 Subdistricts are identified as having high levels of Erosion Hazards so that they were a priority to be handled, namely in the Wajak, Dampit, Tirtoyudo, , Gedangan, Sumbermanjing Wetan and Bantur Subdistricts. Dampit Subdistrict, Turen Subdistrict and Gondanglegi Subdistrict also face behavioral problems and high population pressure compared to other Subdistricts. Research also shows that there is a relationship between erosion and knowledge, attitudes and behavior of the community in the form of population pressure and land use patterns. It is recommended that environmental conservation directives focus on these 6 Subdistricts through the application of soil and water conservation. The results of spatial analysis at priority locations suggest conservation measures in the form of law enforcement or counseling, and community empowerment to increase the ability and independence of the community through providing access to resources, education, and training.
MODEL PENGELOLAAN TERBAIK UNTUK KEBERLANJUTAN DAERAH ALIRAN SUNGAI (DAS) PADA SUB DAS CILIWUNG HULU (The Best Management Model For Sustainability Watershed At The Upper Ciliwung Sub Watershed) Mahawan Karuniasa; Haqqi Annazili Daulay; Muchammad Saparis Soedarjanto
Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Management Research) Vol 3, No 1 (2019): 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 (840.274 KB) | DOI: 10.20886/jppdas.2019.3.1.79-88

Abstract

ABSTRACTThe sustainability of the ecosystem functions of the Upper Ciliwung Sub Watershed is disrupted, indicated by the exceeding of the minimum erosion hazard level compared to its tolerable erosion. This condition is caused by imbalance between forest areas compared to other land uses such as dryland agricultural, paddy fields, and settlement of the watershed. The purpose of this study was to determine the best watershed management practices in the Upper Ciliwung Sub Watershed based on the watershed sustainability model. The data for the sustainability model were obtained through the Analytical Hierarchy Process (AHP). The results showed that the area of forest had the highest value among other land cover aspects with a value of 52.8%. In succession, the next priority was the area of paddy fields by 24.4%; the area of dryland agriculture was 17.9% and the settlement area was 4.9%. It can be concluded that efforts were needed to: 1). Increase the area of forests and reduce the area of dryland agriculture; 2). Managing the area of settlements; 3). Increasing the area of paddy fields.Keywords: watersheds, management practices, environmental restoration ABSTRAKKeberlanjutan fungsi ekosistem Sub DAS Ciliwung Hulu terganggu, ditunjukkan oleh nilai tingkat bahaya erosi minimum yang melebihi batas yang dapat ditoleransi. Hal ini karena kawasan hutan memiliki proporsi yang tidak sebanding dengan luas pertanian lahan kering, luas sawah dan luas permukiman di wilayah tersebut. Tujuan dari penelitian ini adalah untuk menentukan praktik pengelolaan DAS terbaik di Sub DAS Ciliwung Hulu berdasarkan model keberlanjutan DAS. Data yang digunakan untuk keberlanjutan DAS Ciliwung Hulu diperoleh melalui Analytical Hierarchy Process (AHP). Hasil penelitian menunjukkan bahwa luas hutan memiliki nilai tertinggi di antara aspek tutupan lahan lainnya dengan nilai 52,8%. Secara berturut-turut, prioritas berikutnya adalah luas sawah sebesar 24,4%; luas pertanian lahan kering dengan nilai 17,9% dan luas permukiman sebesar 4,9%. Dapat disimpulkan bahwa diperlukan upaya untuk: 1). Meningkatkan luas hutan dan mengurangi luas pertanian lahan kering; 2). Mengelola luas permukiman; dan 3). Meningkatkan luas sawah.Kata kunci: Daerah Aliran Sungai, praktik manajemen, restorasi lingkungan
Pemodelan Tutupan Lahan Untuk Menjamin Keberlanjutan Debit Sungai (Suatu Studi Di Sub DAS Cikapundung-Maribaya) Aditya Dwifebri Christian Wibowo; Mahawan Karuniasa; Dwita Sutjiningsih
IJEEM - Indonesian Journal of Environmental Education and Management Vol 6 No 2 (2021): IJEEM: Indonesian Journal of Environmental Education and Management Volume 6 Nomo
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/IJEEM.062.01

Abstract

Changes in land use in the Cikapundung watershed, ie changes in forest land to built-up land, have an impact on the quantity of river water. Changes in land use in the Cikapundung River catchment are not ideal conditions for absorbing water. If land conversion is not controlled, it can have a large impact on reducing the availability of water resources for subordinate areas or what is called water scarcity. Analysis that takes into account land use and discharge can be done with several hydrological analysis methods, one of them is the Soil Conservation Service Curve Number (SCS-CN) method. Based on the calculation, the CN value was changed in 2014 from 57.275 to 62.591 where land cover changes began to occur. Keywords: land use, river water, water scarcity, hydrology, CN value