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Abstrak :
DAS Citarum Hulu DAS Citarum termasuk ke dalam wilayah Perencanaan Sumberdaya Air Wilayah Sungai (PSDWS) sejak tahun 2016, yang berfungsi sebagai daerah tangkapan air utama dari keseluruhan Sungai Citarum. Ditambah lagi DAS Citarum Hulu mengalami pengembangan secara pesat dan dimanfaatkan sebagai daerah pemukiman, pertanian, pertanian, dan industri. Penelitian ini bertujuan untuk menyimulasikan pencemaran paramater BOD, COD, dan TSS di keseleruhan DAS Citarum Hulu menganalisis sensitivitas parameter permodelan kualitas air sungai DAS Citarum Hulu dengan QUAL2KW. Penelitian ini dilakukan dengan menggunakan metode QUAL2KW. Kondisi eksisting pada Sungai Wangsisagara memiliki konsentrasi BOD yang memenuhi baku mutu, yaitu masih di bawah 12 mg/l, sementara pada lokasi pengujian lainnya mengandung konsentrasi BOD yang melebihi baku mutu. Sungai Wangisagara mengandung konsentrasi COD yang memenuhi baku mutu kelas 3, dan Jembatan Koyod, Sungai setelah IPAL Cisarung, dan Sungai Nanjung memenuhi baku mutu kelas 4. Untuk konsentrasi TSS, pada Sungai Wangisagara memenuhi baku mutu kelas 1, Sungai setelah IPAL Cisarung masih memenuhi baku mutu kelas 3, dan pada Jembatan Koyod dan Sungai Nanjung berada pada kelas 4. Jumlah beban pencemar yang berasal dari air limbah domestik memiliki total beban pencemar BOD sebesar 13,6 juta kg/tahun, COD sebesar 2,6 juta kg/tahun, dan TSS sebesar 40,9 kg/tahun. Hasil analisis sensitivitas terhadap simulasi BOD adalah konsentrasi DO diffuse source, konsentrasi BOD diffuse source, dan debit pencemar diffuse source; COD adalah konsentrasi DO diffuse source, konsentrasi COD diffuse source, dan debit pencemar diffuse source; TSS adalah konsentrasi DO diffuse source, konsentrasi TSS diffuse source, dan debit pencemar diffuse source; DO pada DAS Citarum Hulu segmen Cirawa – Nanjung konsentrasi DO diffuse source, oxygen temperature correction, dan lebar dasar sungai. ......The Upper Citarum Watershed The Citarum River Basin is included in the River Basin Water Resources Planning (PSDWS) area since 2016, the Upper Citarum watershed functions as the main water catchment area of ​​the entire Citarum River. In addition, the Upper Citarum watershed is experiencing rapid development and is used as a residential, agricultural, agricultural and industrial area. This study aims to simulate the contamination of BOD, COD, and TSS parameters in the entire Upper Citarum watershed to analyze the sensitivity of the water quality modeling parameters of the Upper Citarum Watershed with QUAL2KW. This research was conducted using the QUAL2KW method. The existing condition on the Wangsisgara River has a BOD concentration that meets the quality standard, which is still below 12 mg/l, while at other test locations it contains a BOD concentration that exceeds the quality standard. The Wangisagara River contains COD concentrations that meet the class 3 quality standard, and the Koyod Bridge, the River after the Cisarung WWTP, and the Nanjung River meet the class 4 quality standard. class 3 quality, and on the Koyod Bridge and Nanjung River it is in class 4. The total pollutant load originating from domestic wastewater has a total pollutant load of 13.6 million kg/year BOD, 2.6 million kg/year COD, and TSS of 40.9 kg/year. The results of the sensitivity analysis on the BOD simulation are the DO diffuse source concentration, the diffuse source BOD concentration, and the diffuse source pollutant discharge; COD is a diffuse source DO concentration, a diffuse source COD concentration, and a diffuse source pollutant discharge; TSS is a diffuse source DO concentration, diffuse source TSS concentration, and diffuse source pollutant discharge; DO in the Upper Citarum watershed in the Cirawa – Nanjung segment, DO concentration is diffuse source, oxygen temperature correction, and riverbed width.

Abstrak :
Rice fields located in Citarum Hilir watershed of Karawang district are more and more affected by growth of residential and industrial areas. This resulted in the need to have supporting rice fields elsewhere including in the upstream region. ln Citarum Hulu watershed, 19,5% fiom the existing rice fields is non-irrigated with 32,l9% of population work in the agriculture sector. But productivity of' non-irrigated rice fields of Citanim Hulu watershed is still low, which is below 25 kwintal/ha. One of the efforts to increase its productivity is to look at the local climate model. The low productivity may also be caused by factors such as slope and altitude, which are used as variables in Wilayah Tanah Usaha (WTU). Sandy (1985) wrote that growth and death of any plant in Indonesia depend on water. Awarding to Chang (1968) every process in a plant is affected by water. Furthermore, FAO believed that the growth requirement of a rice plant is also depended on water availability. Mohr, Schimdt-Ferguson, and Oldeman made climate classifications based on rainfall in relation with plant needs of irrigation. Spatial climate model and planting time/season are important factors in management of non-irrigated rice fields in Citarum Hulu watershed. These rice fields are nou-unifonnly found in the center down to the south. Rice production varies from 22 to 4l kw/ha where the majority produces 30-40 kw/ha. Productivity model for the northem part is varied, and to the south is more stable with productivity of 30-40 kw/ha. The annual average rainfall in Citarum Hulu watershed is 1770-3458 mm/yr where the majority of the region has in the range of 2000-3000 mm/yr. Maximum monthly rainfall is 558 mm and a minimum of 6 mm on average. Rainfall is high in the months of November to April and dry period is fiom June to August. Mol-rr?s climate classification is around class III - Vb where the majority is in class III-IV. Schmidt-Ferguson?s climate classification for this area is type C to type A, where the majority is in the wet type (A). 0Ideman?s climate classification varies from D3 to Bl where the majority ofthe region is in climate group C-B (humid-wet). ln general, climate model for Citarum Hulu watershed is as follows: in the center (around the city of Bandung) is almost always drier than its surrounding areas, specifically in the northem and southem parts that are mountainous. The distribution of non-irrigated rice fields has a strong correlation with the annual rainfall model of Schimdt-Ferguson and Oldeman, because as an area has more precipitation there tend to be non-irrigated rice fields. But it is not true with Mohr climate. A strong correlation in productivity of non-irrigated rice fields with rainfall model, Mohr, Schmidt-Ferguson, and Oldeman climate models mean that as a region receives more precipitation then 'there is a tendency of higher rice productivity. But there is also a tendency that if an area is extremely wet, the productivity will decrease. Planting season in the Citarum Hulu watershed is from October and May with 4 planting time models: October/February, October/March, November/March, and December/April. In the November/March, planting time is dominant in almost all of the watershed area. Part of the non-irrigated rice fields in Citarum Hulu watershed are still according to the WTU conception, that is 65,87%, which the majority is in the center. As for the rest of this region, they should be converted into protected forest areas (especially in the south) and hard plant agriculture (in the cast). Keywords: DAS Citarum Hulu, non-irrigated rice fields, rainfall, climate model, Mohr, Schmidt-Ferguson, Oldeman, WTU conception, planting time.