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Mrica Reservoir located in Banjarnegara Regency is amultipurpose reservoir. Based on the report of PT Indonesia Power UnitPembangkitan (UP) Mrica in 2016, the sediment of Mrica Reservoir hasentered the critical phase as it reached 114.25 million m3 and the value ofland-cover index of Mrica reservoir was 80% of the total watershed areawith the average sedimentation rate reaching 4.09 million m3 per year. Itis estimated that the reservoir will be full of sediment by 2021. The maincause of the high rate of sedimentation in Mrica reservoir is the changes inland use and agricultural-plantation activities in the upper river areas andalong the river flow of Serayu River, Merawu River, and Lumajang River. This study aimed to determine the appropriate type of conservation forMrica Reservoir. The method used was the Analytical Hierarchy Process(AHP), in which the determination of conservation efforts was based onsecondary data and observation. According to the current condition ofMrica Reservoir, the planned conservation efforts include two types, namely non-structural conservation and structural conservation. If theconservation begins in 2019, the total sediment in 2021 will decrease to74% and it is predicted that the sediment will be exhausted by 2056.

Fomasi litologi akuifer batugamping mempunyai karakteristik media aliran berupa celah, rekahan, dan lorong pelarutan, sehingga memiliki potensi mengalirkan airtanah dengan kecepatan tinggi. Produktivitas yang tinggi ini mengakibatkan sumber pencemar di permukaan dapat dengan cepat meresap ke sistem akuifer dan bercampur dengan airtanah; kondisi inilah yang memicu kerentanan tinggi. Salah satu langkah pengelolaan airtanah pesisir adalah penentuan zona kerentanan airtanah terhadap pencemaran. Dengan demikian, tujuan penelitian ini adalah untuk mengetahui tingkat kerentanan airtanah pesisir terhadap pencemaran di formasi batugamping menggunakan metode COP dengan pendekatan intrinsik dan metode EPIK dengan pendekatan perkembangan karst. Hasil penilaian menggunakan kedua metode tersebut menunjukkan tingkat kerentanan rendah hingga sangat tinggi. Pemetaan metode COP menghasilkan dua kelas kerentanan: rendah (95% dari luas wilayah) dan sedang (4%), sedangkan metode EPIK menghasilkan zona indeks kerentanan yang lebih panjang dengan empat kelas kerentanan, yaitu rendah (1,23%), sedang (17,82%), tinggi (17,82%), dan sangat tinggi (21,65%). Dibandingkan dengan COP, EPIK menghasilkan kelas kerentanan yang lebih tinggi karena pengaruh koefisien pembobot pada formula penghitungannya. Hasil penilaian kerentanan divalidasi dengan indikator limbah domestik berupa senyawa nitrat (NO3). Uji laboratorium menunjukkan kandungan nitrat (NO3) airtanah yang bervariasi dari 0,12 mg/l (terendah) hingga 9,80 mg/l (tertinggi). Variasi ini masih berada di bawah baku mutu air minum tetapi di atas baku mutu air limbah domestik atau melebihi kadar nitrat di alam. Berdasarkan hasil validasi, zona kerentanan berkorelasi dengan kandungan nitrat (NO3). Pada zona kerentanan yang tinggi, ditemukan kadar nitrat yang tinggi pula.ABSTRACTA limestone aquifer is lithologically characterized by three flow media: fissures, fractures, and dissolution channels, thus creating the potential to drain groundwater at a high rate. This high productivity, however, means that the groundwater is highly vulnerable to pollution. If a pollutant source is present on the surface, it can quickly seep into and mix with the subsurface system. Among the widely proposed management strategies is groundwater vulnerability zoning. This study was intended to determine the degrees of coastal groundwater vulnerability to pollution in a limestone formation with two methods: COP intrinsic vulnerability) and EPIK (karst development-based vulnerability). The assessment results showed that the vulnerability produced with both methods varied from low to very high. In the mapping, COP produced two levels: low (95% of the total area) and medium (4%), while EPIK generated a longer vulnerability index zone with four levels: low (1.23%), medium (17.82%), high (17.82%), and very high (21.65%). Compared to COP, EPIK results in a higher vulnerability class due to the weighting values in its vulnerability assessment. The results were validated with a domestic waste indicator: the presence of nitrate (NO3). Laboratory tests showed NO3 concentrations in the range 0.12 of 9.80 mg/l. These figures are still below the quality standard for drinking water but above that of domestic wastes or exceeding the maximum NO3 content found in nature. The validation revealed that the vulnerability zone is correlated with NO3 levels: the higher the vulnerability class of the zone, the higher the nitrate content.

Landslide, one of the physical environmental disasters, can be defined as the movement of rock mass, soil, or shredded material that forms a slope down the slope Kulon Progo Regency has always been a landslide-prone area that most often occurs in the Special Region of Yogyakarta in the last three years. One way to reduce the risk of hazards is by mapping the hazard assessment of mass movement disasters. The purpose of this study is to determine the zone of vulnerability to landslides in the Serang watershed, Kulon Progo. The method used is heuristic, where the assessment of the potential for ground motion is based on a geomorphological approach with a weighting analysis of each parameter. The parameters used are slope, rock type, geological structure (distance to fault), land use, and landslide event distribution. Each parameter is assigned a value and a weight variable based on the factors that most influence slope safety. They are then calculated in a linear variable manner, resulting in an index value for soil movement vulnerability. The index value is grouped spatially into four (4) hazards with equal interval class division, very low hazard with an area of 95.93 km2 (46%); low hazard with an area of 72.02 km2 (34%); moderate hazard with an area of 38.56 km2 (18%); and very high hazard with an area of 1.96 km2 (0.01%). Based on the spatial analysis, the distribution of the existing landslide events are increasing correlatively with the higher the hazard zone.

<p><strong>Aim:</strong> This study aims to assess the entire process of septage management comprising regulation, operational procedures, finance, community involvement, and water quality analysis to maximize the initial and hugest human fecal sludge treatment called Faecal Sludge Treatment Plant (IPLT) in Yogyakarta. <strong>Methodology and Results:</strong> The Modified EHRA (Environmental Health Risk Assessment) method was applied which focused only on wastewater treatment aspect. Several regulations including standard quality methods (SNI) were utilized and made a comparison between baseline rules and obtained results. Furthermore, quality assessment was accomplished by observation and interview. The results showed that the human sector needs to improve not only the amount of operators but also urgently put up protective personal equipment during the suction process. The dissemination of attractive information about sludge suction service done by PUPKP as a representation of the local government among the dwellers ought to upgrade a lot. Technologies employed which are carriage transportation and vacuum machine, are good enough. Contrarily, septage treatment plants require extra-effort to enhance it as most water quality parameters barely meet the standard quality. BOD, COD, ammonia, total coliform, oil and grease do not meet the third class of water quality (Government Regulation of Republic of Indonesia No. 82/2001). Subsequently, the effectiveness of each unit i.e. anaerobic tank and stabilization ponds are under 50% and the loading rate has a maximum capacity of 87.5m³/day, and 60m³/day minimum capacity. <strong>Conclusion, significance and impact of study:</strong> Therefore, almost all aspects of septage management in Bantul Yogyakarta are required to improve</p>

INTISARIKondisi fisik kawasan karst yang didominhasi oleh bentuklahan hasil proses pelarutan batuan menyebabkan berkembanganya sistem pelorongan, drainase bawah tanah dan sistem gua. Hal tersebut menyebabkan kelangkaan air di bagian permukaan sehingga kawasan karst lebih dikenal sebagai kawasan yang rawan terhadap bencana kekeringan. Penelitian ini bertujuan untuk (1) mengetahui peranan organisasi masyarakat lokal dalam pengelolaan sumberdaya air yang terbatas pada musim kemarau di Dusun Turunan, Kecamatan Panggang, kabupaten Gunungkidul, dan (2) mengidentifikasi strategi adaptasi masyarakat dalam menghadapi bencana kekeringan di kawasan karst. Hasil penelitian menunjukkan bahwa organisasi masyarakat berperan sangat besar dalam pengelolaan sumberdaya air pada musim kemarau. Organisasi ini berperan dalam pembagian jatah air, pengoperasian pompa, perawatan dan pengelolaan instalasi penyedia air, dan pengawasan terhadap pemanfaatan air. Strategi adaptasi terhadap bencana kekeringan yang dilakukan berupa larangan memandikan ternak, larangan mencuci motor, serta pembagian penyaluran air untuk masing-masing kelompok rukun tetangga.Kata Kunci: Organisasi Masyarakat, Strategi Adaptasi, Kekeringan, Karst I. PENDAHULUANProses pelarutan batuan yang terjadi akibat adanya interaksi air hujan, karbondioksida dan batuan karbonat telah menyebabkan terbentuknya kawasan karst (Ford dan William, 1992). Proses tersebut menyebabkan terbentuknya sistem pelorongan, drainase bawah tanah, sistem gua serta celahcelah pelarutan yang menyebabkan air di permukaan dalam waktu singkat masuk ke dalam sistem bawah tanah (White, 1988). Hal ini menyebabkan kondisi kering di permukaan, sehingga sumber air di permukaan jarang sekali ditemukan (Cahyadi, 2010). Hal inilah yang menyebabkan kawasan karst terkenal sebagai kawasan yang rawan terhadap bencana kekeringan (Suryanti dkk. 2010).Jarangnya sumber air permukaan di kawasan karst menyebabkan mataair dan telaga yang merupakan sumber air dipermukaan menjadi sangat penting (Worosuprojo dkk, 1997;Santosa, 2007).Jumlah air yang terbatas dibandingkan jumlah kebutuhan yang banyak tentunya akan mendorong terbentuknya pola adaptasi masyarakat (Awang, 2005). Hal ini karena secara naluriah manusia akan berusaha bertahan hidup dalam kondisi keterbatasan (Twigg, 2004). Namun demikian, dalam bertahan hidup tersebut, manusia dikontrol oleh norma-norma yang berlaku sehingga kemudian memunculkan pola adaptasi yang unik dan khas di dalam kelompok masyarakat (Sudarmaji dkk, 2012).

Farmers in Indonesia widely use organophosphate pesticides (OPPs) to increase crop production, despite their risk to human health and the environment. Objective of this study is to estimate the loading rate and risk level of OPPs based on OPPs characteristics, farmers’ knowledge, and the behavior of OPPs application in agriculture area in Yogyakarta Special Region in Indonesia. Data collected through interview and questionnaire distribution revealed three types of OPPs used in study area; profenofos, chlorpyrifos and diazinon. Data on application dose and crop area were used to estimate loading rate. Risk scores can be calculated by multiplying loading rate with toxicity data of each type of OPPs used. Box-Cox transformation was then used to normalized rightly skewed risk score data to get 4 (four) levels of risk classification range; low, medium, high and very high. It was found that there were areas classified as very high risk in wet season, while it is not the case in dry season. However, in total loading per year, areas with high and very high risk level were found for more than >50% in study area.