Mineral wool has been used as a filter medium that reaches approximately 95% removal efficiency of total suspended solids (TSS) on a laboratory scale. However, there is no research available has been applied on a larger scale. Hence, this study investigated the ability of mineral wool to remove TSS in two separate segments of the Cikapayang River at different seasons. This analysis utilizes a mineral wool type I, with a dimension of 180×30×120 cm placed in segment 2, and a mineral wool type II with a dimension of 325×30×100 cm placed in segment 9. Samples were taken using the grab sampling method to analyze the TSS concentration before and after being filtered by mineral wool. This investigation concluded that mineral wool could reduce the TSS concentration by up to 65%, and the removal capacity increased by about 6.82% during the dry season. The concentration of TSS in the dry season positively correlates with the increase in the removal capacity of the media. Mineral wool of type I in segment 2 had a better removal ability (31.43%) than type II in segment 9 (14.71%). This research shows that mineral wool can be used as a support material in sanitation sites in large cities experiencing quality degradation in their water bodies.

<p align="center"><strong>Abstract</strong></p><p class="11daftarpustaka"> </p><p class="11daftarpustaka">The problem of the water availability has become a global issue so that it needs a tool for water management such as the Soil and Water Assessment Tool (SWAT). This study aims to measure how far the uses and developments of the SWAT model in the Krueng Aceh watershed. This paper reviewed applications of SWAT Model in Krueng Aceh Watershed. The developments data were obtained from five publications. This study has limitations in assessing the performance of the SWAT developed in the Krueng Aceh watershed/sub-watershed because not all publications report on the calibration or validation process. From the search results, there is one modeling application that performs the calibration process with statistical parameters on a daily scale and the other three papers on monthly data. The availability of observation data has not had a long time series makes researchers face limitations in improving the model performances.</p><p class="11daftarpustaka"> </p><p class="11daftarpustaka">Keywords: <em>SWAT, Hydrological Model, Water, Soil</em></p><p class="11daftarpustaka"> </p><p class="11daftarpustaka"> </p><p align="center"><strong>Abstrak</strong></p><p class="11daftarpustaka"> </p><p class="11daftarpustaka">Masalah ketersediaan air telah menjadi isu global sehingga diperlukan suatu alat untuk pengelolaan air seperti <em>Soil and Water Assessment Tool (SWAT).</em> Penelitian ini bertujuan untuk mengukur sejauh mana pemanfaatan dan perkembangan model SWAT di DAS Krueng Aceh. Artikel ini mengulas penerapan Model SWAT di DAS Krueng Aceh. Data perkembangan diperoleh dari lima publikasi mengenai Model SWAT. Kajian ini memiliki keterbatasan dalam menilai kinerja SWAT yang dikembangkan di DAS/sub-DAS Krueng Aceh karena tidak semua publikasi melaporkan proses kalibrasi atau validasi. Dari hasil pencarian, terdapat satu aplikasi pemodelan yang melakukan proses kalibrasi dengan parameter statistik pada skala harian dan tiga aplikasi lainnya pada data bulanan. Ketersediaan data lapangan yang belum memiliki data time series yang panjang membuat peneliti menghadapi keterbatasan dalam meningkatkan perfoma model.</p><p class="11daftarpustaka"> </p><p class="11daftarpustaka">Kata Kunci: <em>SWAT, Model Hidrologi, Air, Tanah</em><em></em></p>

Data SIPSN tiga tahun terakhir menunjukkan timbulan sampah di Kabupaten Langkat meningkat 24,71% atau dari yang awalnya 152.099 menjadi 189.685 ton. Lebih dari 42% timbulan sampah disumbangkan oleh sektor domestik yang seharusnya dapat dikelola sedekat mungkin dari sumbernya. Dengan demikian, kegiatan pengabdian kepada masyarakat ini bertujuan memberikan pelatihan agar masyarakat lebih memahami cara mengurangi timbulan sampah dengan mengubahnya menjadi produk yang bermanfaat. Pelatihan dilaksanakan pada 5 Agustus 2021 di Rumah Komunitas Pohon Rindang, Desa Perkebunan Bukit Lawang, kepada 43 anak usia 8-15 tahun. Metode yang digunakan adalah penyuluhan interaktif dengan memberikan demonstrasi cara membuat keranjang takakura dan stringbag. Keranjang takakura 45x37x57 cm dapat menampung hingga 1,5 kg sampah organik basah per hari, sedangkan pembuatan pakaian bekas menjadi stringbag dapat menunda pembuangan material ke TPA. Dalam jangka panjang kegiatan ini diharapkan menjadi kebiasaan baru bagi masyarakat dalam mengelola sampah untuk menjadikan Desa Perkebunan Bukit Lawang sebagai desa pariwisata yang berkelanjutan.

Indonesia is an archipelagic country located on the equator. The issue of climate change has become a global issue that has impacted several sectors in Indonesia recently. The presence of the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC) has contributed to conducting studies on flood and drought events. This review paper summarized 16 published papers that have gone through peer-review, both in the form of publications in journals and at conferences. Since the release of the IPCC AR5 to date, ten studies on flooding and six studies on drought events have been conducted. The most publications on this in 2019 were five publications. Of the various types of the Representative Concentration Pathway (RCP) scenarios used with various methods, the most widely used scenario RCPs is RCP4.5. From the climate change scenario, precipitations parameter is the main parameter that is used in assessing flood or drought events. There are studies conducted on a district / city, provincial scale, and some are even carried out on a watershed scale. The location or province that most flood studies have been carried out is in the capital of Jakarta. The results of these studies generally indicate that the incidence of floods and droughts will increase in the future. Therefore, adaptation steps are needed to deal with unfavorable conditions in the future. Moreover, as the capital city, Jakarta has been estimated that the projected flood incidence will increase. Several publications have provided steps to deal with these challenges on the positive side.

Indonesia is an agricultural country where the livelihood of the majority of the population is farming. Geographically, Indonesia is an archipelagic country that has enormous natural potential, both in the marine and agricultural fields. The agricultural sector is a sector that has an important role in improving the welfare of the entire population of Indonesia. Rice fields in Blang Beurandang Village still rely on irrigation from using rainwater to meet irrigation water needs. To increase rice yields, an irrigation network is needed that can flow water to the rice fields. It is necessary to conduct a feasibility study on the irrigation to be built so that it can be calculated from an economic point of view whether the project is feasible or not. This feasibility study is equipped with an analysis using the first method; Net Present Value (NPV), the second is the Benefit Cost Ratio (BCR) analysis, the third is the Internal Rate of Return (IRR), and the fourth is the Break Event Point (BEP). The results of this study are the value of the investment cost of the construction project or the initial capital of the irrigation canal which is IDR. 2,088,058,500, and the value of the operational and maintenance costs is IDR. 9,578,250 per year. The results obtained that NPV was IDR. 30,614,330, BCR was 1.01%, IRR was 5.88% > 5% and BEP occurred in the 22nd year and the 7th month. Based on the calculation results obtained from these four methods, it shows that the irrigation channel construction project has met the eligibility requirements and the project can be implemented or built. This means that the construction of irrigation networks in the village is feasible.