Perubahan iklim merupakan isu yang sedang dihadapi oleh masyarakat global, yang berpengaruh terhadap variabilitas suhu udara dan curah hujan. Peningkatan suhu udara dapat menyebabkan penurunan debit andalan atau ketersediaan air. Terkait dengan hal tersebut, penelitian ini bertujuan untuk mengetahui trend dari perubahan suhu udara dan curah hujan terhadap ketersediaan air di Daerah Aliran Sungai (DAS) Ciliwung selama 30 tahun (1985 s.d. 2015). Analisis kenaikan trend variabel iklim dilakukan dengan menggunakan metode Mann Kendall Trend Test, analisis neraca air menggunakan metode neraca surplus defisit, dan analisis ketersediaan air menggunakan metode Mock. Dari hasil analisis diketahui bahwa tidak ada perubahan variabilitas curah hujan. Suhu rata-rata naik sebesar 0,20C, suhu minimum naik sebesar 0,90C, dan suhu maksimum naik sebesar 0,80C selama 30 tahun terakhir. Ketersediaan air teridentifikasi menurun sebesar 2 m3/s atau sebesar 2.000 l/s selama 30 tahun terakhir. Analisis neraca air kemudian dilakukan berdasarkan nilai kebutuhan air irigasi di intake maksimum sebesar 8,46 l/s/ha dan luas areal irigasi yang diairi oleh Bendung Katulampa yang berkurang mulai tahun 1985 sampai 2015 dari 1.288 ha menjadi 333 ha.  Hasil tersebut menunjukkan bahwa tidak terjadi defisit neraca air untuk lahan pertanian di DAS Ciliwung. Hasil dari penelitian ini diharapkan dapat menjadi bahan masukan untuk pengelolaan sumber daya air di daerah hulu DAS Ciliwung.

According to a survey by Nova Chemicals, Indonesia is the second largest contributor to sea waste after China, which is 1.29 million metric tons / year. At present there are still many people in Indonesia who throw garbage in any place, and can caused flooding in the river. The river is polluted with a lot of waste, one of which is the Citarum River. Citarum River is a river that is very important for residents of West Java. The condition of the Citarum River which is very alarming is polluted by waste and garbage. In the world's leading survey site, the Citarum River occupies the 4th position for the dirtiest river problem. The rubbish that pollutes the Citarum River is more inorganic or unbiodegradable, for example plastic, bottles or beverage cups, plastic food wrapping, and so on. As we know plastic waste is very difficult to decompose, it takes more than 100 years to decompose the plastic decomposed or decompose completely. Plastic waste is one source of environmental pollution in Indonesia. The benefits of using plastic products must be balanced with the calculation of the negative impact produced. The nature of this plastic material makes it difficult to replace it with other materials for various applications, especially in everyday life ranging from food packaging, household appliances, children's toys, electronics to automotive components. Increased use of plastic materials has resulted in increased production of plastic waste from year to year. The destruction of plastic waste by burning will only worsen the health because of the anti-dioxy substance produced. The most appropriate method used in dealing with waste is to use the Ecobrick method. The team of Pancasila University wanted to socialize how to make an ecobrick, and how strong the compressive on the ecobrick material was made. To overcome waste, especially plastic along the Citarum river. This socialization was held in Tanjung Mekar Village, Karawang Barat sub-district, Karawang Regency. The participants coming from the community of environmentalists (Eco Village). Community of eviromentalists hope will provide direction and socialization to their about the ecobrick method to deal with plastic waste that cannot be recycled. From the results of testing carried out at the Pancasila University concrete laboratory using ecobrick materials is plastic bottles filled with pure plastic, filled with sand, and a mixture of plastic and sand compared to red brick and concrete brick sold in the market, from the compressive strength test results it is known that the material ecobrick which contains of sand shows the greatest compressive strength value is 41.2 Mpa, compared to red brick which is 27 Mpa and concrete brick is 38 Mpa ecobrick has a higher compressive strength than other materials

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Run off is one of the most important hydrological variables in supporting water resources development planning and activities. To predict the amount of runoff can be done in various ways one of them with the SCS-CN method. The SCS method was developed from years of rainfall observation and involved many agricultural areas in the United States. This method seeks to link watershed characteristics such as soil, vegetation, and land use with a runoff curve number which indicates the potential runoff water for a particular rainfall. The location of this research is Garut Regency, upstream of the Cimanuk river, which often floods every year due to overflowing of the Cimanuk River. Data used to determine CN values and runoff height are Digital Elevation Model (DEM), land use, soil, and rainfall data for the last 10 years, from 2009 to 2018, then the maps are processed using the Arc-Map program. From the analysis it can be seen that the CN value is 66.54%, and the runoff height is 1.17 cm with a 2 year return period, and 2.84 cm at 25 return period. Based on the CN value, it is known that the type of soil in the upstream Cimanuk watershed has a small infiltration rate and has bad properties in infiltrating water, so that it can cause run off for a long time, because the smaller CN value on a land use, so soil’s retention ability is greater and the less chance of runoff. The results of this study can be used for planning flood control buildings in the upper Cimanuk watershed.

Flood disaster is the most common disaster in Indonesia, flood events continue to increase and occur almost every year during the rainy season, on average caused by extreme rainfall above 100 mm, with the number of losses increasing every years, there are many factors that affect One of the causes of flooding is human activities resulting in changes in land use in the form of settlements and agricultural land. This paper aims to present a conceptual reference from the implementation results using software assistance, to determine the level of influence and dependent variables. The method used to assess the most influential factors on flood events, especially in the Ciliwung watershed, is by using Cross-Impact Matric Multiplication Applied to Classification (MICMAC). From the 11 contributing factors analyzed based on the Matrix of Direct Influence (MDI) and Matrix of Indirect Influence (MII) it is known that rainfall and distance from the river are the variables that have the most influence. While the variables with the greatest dependence based on MDI and MII are land cover, slope, population density and river waste, with institutions experiencing a larger variable displacement compared to other variables. The results of the identification of these contributing factors can be used by stakeholders to be careful of each factor as input in anticipating influencing factors.