<em>Hydrometeorological disaster management in Indonesia such as floods, drought, tornadoes, etc., which occur almost every year in Indonesian territory, is carried out with structural efforts, however, it seems that the occurrence of disasters is still occurring even the intensity is increasing. To minimize the occurrence of hydrometeorological disasters, it is necessary to try a non-structural approach, namely the Weather Modification Technology (WMT). The application of WMT for hydrometeorological disaster mitigation can be used as an alternative solution in disaster risk reduction in Indonesia. The current WMT can be used to increase rainfall, to reduce rainfall, to mitigate floods and to reduce smoke due to forest and land fires. The application of WMT for additional rainfall is able to increase rainfall by about 30%, while to reduce rainfall, it can reduce rainfall by about 30-35%. This technology can be used as an integral part in the management of water resources in Indonesia.</em>
Penelitian ini bertujuan untuk menghitung B/C ratio dari pelaksanaan Teknologi Modifikasi Cuaca melalui parameter-parameter nilai biaya produksi, banyaknya air yang dibutuhkan untuk pengairan, harga gabah per ton, produksi gabah per ha, sehingga nilai B/C dari pelaksanaan TMC sebagai nilai riil yang sudah bisa dipertangungjawabkan kepada publik. Secara khusus penelitian ini bertujuan menghitung nilai ekonomis penerapan Teknologi Modifikasi Cuaca di Daerah Aliran Sungai (DAS) Citarum Jawa Barat dari aspek PLTA dan pertanian. Data penelitian berupa data sekunder dari hasil kegiatan TMC di Das Citarum tahun 2007. Adapun data yang dibutuhkan dalam penulisan paper adalah data aliran Waduk (DMA, Inflow dan Outflow) selama kegiatan TMC berlangsung antara lain data: tambahan potensi energi listrik; besarnya volume air yang digunakan untuk menghasilkan 1 kWh; harga listrik per kWh; estimasi hasil produksi padi per hektar; biaya produksi pertanian per ha per tanam; estimasi besarnya kebutuhan air pertanian per hektar per panen; harga gabah kering giling per kg; biaya pelaksanaan TMC. Teknik pengumpulan data melalui survei lapangan dan wawancara mendalam dengan kelompok tani di daerah Subang, Karawang, dan Indramayu dengan didukung studi literatur yang terkait dengan informasi mengenai aspek ekonomi Teknologi Mudifikasi cuaca. Hasil penelitian menunjukkan bahwa jumlah tambahan air kegiatan TMC di Das Citarum tahun 2007 sebanyak 716,92 juta m3. Dengan tambahan air tersebut dapat menghasilkan jumlah kWh listrik sebanyak 447.284.99 kWh. Dari tambahan air tersebut dapat memberikan manfaat ekonomi pada sektor PLTA sebesar Rp. 85.252.520.810,- dan sektor pertanian sebesar Rp. 610.643.840.116,- Manfaat ekonomi secara total kegiatan TMC sebesar Rp. 695.896.360.926,- Dari hasil tersebut secara ekonomis besarnya nilai B/C rasio sebesar 233:1. Hal ini berarti setiap pengeluaran sebesar Rp.1,- maka akan dapat diperoleh pendapatan sebesar Rp. 233,-This study aimed to calculate benefit cost ratio of the implementation of WeatherModification Technology and to learn about production costs, the amount of waterneeded for irrigation, the price of grain per ton, the production of grain per hectare,so the value of B / C of the implementation of the TMC as a real value which canresponsibility to the public. Specifically this study aims to calculate the economic value the application of the weather modification technology on the Citarum River Basin of West Java from the aspects of hydropower and agriculture. The research data in the form of secondary data that are time-series in 2007. The research data in the formof secondary data from the TMC in Das Citarum activities in 2007. The data requiredfor the writing of this paper include: data stream reservoir (DMA, Inflow and Outflow)for TMC events take place, among others: Additional data potential of electric energy;cost data for agricultural production per hectare per cropping; data size of the volumeof water used to produce 1 kWh; electricity prices per kWh; data estimation of riceproduction per hectare; estimate the amount of agricultural water demand per hectareper harvest, the price of milled rice per kg dry; cost of operation TMC. Data collectingtechniques through interviews with farmers groups in the area of Subang, Karawang,Indramayu supported by studies in the literature after the focus of research relatedto information regarding the economic aspects of technology Mudifikasi weather. Theresults showed that the additional amount of water activity of TMC in Das Citarum2007 as many as 716.92 million m3. With the addition of water during TMC activitiescan generate as much electricity as the number of kWh 447.284.99. Benefit of TMC inhydropower sector Rp. 85,252,520,810 and benefits in the agricultural sector Rp. 610643 840 116. Total economic benefits of TMC activity Rp. 695 896 360 926, - The result analysis B/C ratio of 233:1. This means that every expenditure amounting to Rp1, - you will get an income of Rp. 233
<em>The phenomenon of forest and land fires (karhutla) in Sumatera always recurs every year. During the dry season, it is necessary to be aware of the emergence of hotspots and be addressed immediately before an actual fire occurs. This study aims to prevent the risk of forest and land fires by applying Weather Modification Technology (TMC). The application of TMC is intended to wet the land (rewetting) so that hotspots do not appear. The research was conducted in Riau, Jambi and South Sumatera Provinces. Research observations were carried out from May to June 2020. The results showed that TMC could increase the intensity of rainfall. The volume of rainwater produced for Riau is 44.1 million m<sup>3</sup> and in Jambi and South Sumatera as much as 50.20 million m<sup>3</sup>. The rainfall that falls is expected to wet the peatlands and fill the peat domes so that TMAT (ground water level) is maintained and soil moisture is maintained. During the implementation of TMC, it was possible to keep the TMAT from dropping more than 40 cm, even for some locations where the TMAT peat measurement had increased.</em>
<em>During the dry season there was potential for forest and land fires and the water supply in the reservoir was reduced, including electricity & agriculture. An effort made by Government (1976-2020), was TMC (weather modification technology) which used aircraft and chemicals. Many roads lead to Rome, including Anion-based TMC and solar power. TMC Anion in Indonesia is still being studied, but in several countries it has entered the operational and commercial phases and can compete with the provision of clean water with other technologies. TMC studies and experiences in Australia, Oman, Jordan, as well as Germany, Switzerland and Russia. TMC is very prospect applied in Indonesia, also very economical. In addition, smoke as Karhutla particles is a problem, both visibility and ISPA disease, with TMC Anions smoke can be modified into CCN and finally into clouds and rain, so that Karhutla can be reduced and water supply can be fulfilled.</em>
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