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"[Limbah cair dari sumber domestik ataupun industri di sepanjang aliran DAS Kali Bekasi berperan dalam pencemaran yang terjadi di badan air sungai. Hal ini berpengaruh pada penurunan kualitas air baku di Saluran Tarum Barat yang merupakan sumber air bersih untuk kota Jakarta ketika bertemu di Pintu Air Bekasi. Sehingga pencemaran di DAS Kali Bekasi perlu dikendalikan agar tidak mempengaruhi kualitas air baku di Saluran Tarum Barat. Penelitian ini menggunakan QUAL2K untuk menghitung beban pencemaran yang masuk ke sungai untuk memprediksi kualitas air disepanjang aliran dalam parameter BOD dan Nitrogen dalam rangka proses manajemen kualitas air. Pembangunan model dilakukan dengan mengidentifikasi daerah yang berpotensi mencemari sungai dan menjalankan model secara trial and error dengan membandingkan hasilnya dengan data sekunder untuk menvalidasi model. Dari pemodelan QUAL2K BOD dan Nitrogen diprediksi dengan memodelkan limbah industri dan domestik yang masuk ke DAS Kali Bekasi. Dari model dihasilkan bahwa disepanjang aliran DAS Kali Bekasi potensi pencemaran yang terjadi cukup besar didaerah bantaran sungai. Dari perhitungan TMDL didapatkan beban BOD maksimum di Kali Bekasi adalah 199,164 kg/hari.;Wastewater from domestic or industri source in Bekasi River watershed have a big influence to polluted river water body. This thing result decreasing water quality in Tarum Barat Canal that use to supply water for Jakarta when cross in Bekasi Floodgate. Because of this pollution di Bekasi river watershed need to control in order not to influence water quality in Tarum Barat Canal. This study uses QUAL2K for calculate the pollution load into the river to predict water quality along the river flow within parameter BOD and Nitrogen in the framework of the process of water quality management. Model construction is done by identifying area that could potentially contaminate the river and model running by trial and error method with compared the result with secondary data to validate the model. From modeling with QUAL2K BOD and Nitrogen predicted along Bekasi River with input from domestic wastewater and industrial wastewater. From model output along river body in Bekasi River watershed have a potential to contaminated water especially from area near riverbanks and from TMDL?s calculation obtained BOD maximum in Bekasi River is 199,164 kg/day.;Wastewater from domestic or industri source in Bekasi River watershed have a big influence to polluted river water body. This thing result decreasing water quality in Tarum Barat Canal that use to supply water for Jakarta when cross in Bekasi Floodgate. Because of this pollution di Bekasi river watershed need to control in order not to influence water quality in Tarum Barat Canal. This study uses QUAL2K for calculate the pollution load into the river to predict water quality along the river flow within parameter BOD and Nitrogen in the framework of the process of water quality management. Model construction is done by identifying area that could potentially contaminate the river and model running by trial and error method with compared the result with secondary data to validate the model. From modeling with QUAL2K BOD and Nitrogen predicted along Bekasi River with input from domestic wastewater and industrial wastewater. From model output along river body in Bekasi River watershed have a potential to contaminated water especially from area near riverbanks and from TMDL?s calculation obtained BOD maximum in Bekasi River is 199,164 kg/day., Wastewater from domestic or industri source in Bekasi River watershed have a big influence to polluted river water body. This thing result decreasing water quality in Tarum Barat Canal that use to supply water for Jakarta when cross in Bekasi Floodgate. Because of this pollution di Bekasi river watershed need to control in order not to influence water quality in Tarum Barat Canal. This study uses QUAL2K for calculate the pollution load into the river to predict water quality along the river flow within parameter BOD and Nitrogen in the framework of the process of water quality management. Model construction is done by identifying area that could potentially contaminate the river and model running by trial and error method with compared the result with secondary data to validate the model. From modeling with QUAL2K BOD and Nitrogen predicted along Bekasi River with input from domestic wastewater and industrial wastewater. From model output along river body in Bekasi River watershed have a potential to contaminated water especially from area near riverbanks and from TMDL’s calculation obtained BOD maximum in Bekasi River is 199,164 kg/day.]"

"QUAL2K merupakan pemodelan numerik yang biasa digunakan untuk badan air permukaan. Model ini dinilai sederhana dengan hasil yang didapat cukup akurat. Walau cukup sederhana, variabel yang diperlukan untuk QUAL2K cukup banyak, sehingga pada umumnya parameter yang digunakan sudah bersifat default. Dimana hal ini menyebakan tidak diketahuinya sensitivitas atau seberapa berpengaruhnya suatu parameter terhadap objek studi. Penelitian ini bertujuan untuk mensimulasikan kualitas dan perubahan amonia, total nitrogen, BOD, dan DO pada Sungai Ciliwung dari hulu ke hilir dengan aplikasi QUAL2K dan menganalisis hubungan antara sensitivitas parameter laju reaksi kinetik dan variabel input terhadap kualitas amonia, total nitrogen, BOD, dan DO pada Sungai Ciliwung. Metode yang digunakan untuk analisis pada penelitian ini adalah metode QUAL2K. Melalui simulasi pada kondisi eksisting, diketahui bahwa untuk konsentrasi amonia hanya segmen satu yang memenuhi baku mutu PP No.22 Tahun 2021. Seluruh segmen pada untuk parameter total nitrogen memenuhi baku mutu. Untuk konsentrasi dari BOD hanya segmen satu yang memenuhi baku mutu kelas IV. Dan terakhir untuk DO hanya ada segmen satu memenuhi baku mutu untuk kelas II, III, dan IV. Berdasarkan hasil analisis sensitivitas diketahui untuk amonia paling sensitif dengan konsentrasi amonia, debit diffuse source, koreksi temperatur reaerasi oksigen. Untuk total nitrogen paling sensitif dengan konsentrasi amonia, debit diffuse source, dan koreksi temperatur nitrifikasi amonia. BOD paling sensitif dengan koreksi temperatur CBOD Fast, konsentrasi BOD diffuse source, debit diffuse source. Parameter yang terakhir yaitu DO paling sensitif dengan koreksi temperatur reaerasi oksigen, air temperature, koreksi temperatur CBOD Fast. Sehingga berdasarkan analisis sensitivitas, parameter debit diffuse source dan koreksi temperatur paling sensitif terhadap seluruh parameter.

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QUAL2K is a numerical model commonly used for surface water bodies. This model is regarded as being clear, and the outcomes are relatively accurate. Although QUAL2K is very basic, there are a number of variables that must be used, hence default values are typically used. Where this results in undetermined sensitivity or how important a parameter is to the study's subject. The purpose of this study is to use the QUAL2K application to simulate the quality and change of ammonia, total nitrogen, BOD, and DO in the Ciliwung River from upstream to downstream and to examine the relationship between the sensitivity of the kinetic reaction rate parameters and input variables on the quality of ammonia, total nitrogen, BOD, and DO on the Ciliwung River. The method used for analysis in this study is the QUAL2K method. Through simulations under existing conditions, from ammonia concentration only segment one meets PP No. 22 of 2021 quality standards. For the total nitrogen, all segments meet the quality standards. For the concentration of BOD, only segment one meets class IV quality standards. And finally, for DO there is only segment one that meets the quality standards for class II, III and IV. Based on the results of the sensitivity analysis, it is known that ammonia is most sensitive to ammonia concentration, diffuse source discharge, oxygen reaeration temperature correction. While for total nitrogen, the parameter is sensitive to ammonia concentration, diffuse source discharge, and ammonia nitrification temperature correction. For the next parameter which is BOD is sensitive the most to temperature correction CBOD Fast, diffuse source BOD concentration, diffuse source discharge. And the final parameter is DO that is sensitive to oxygen reareration temperature correction, air temperature, CBOD Fast temperature correction. Therefore, based on the study, diffuse source discharge and temperature correction will be the most dependent on water quality parameters."

"Salah satu upaya pemerintah dalam menanggulangi banjir di DKI Jakarta adalah membuat saluran interkoneksi (sudetan) yang menghubungkan sungai Ciliwung dan sungai Cipinang. Dengan adanya sudetan tersebut maka akan menambah bebanpencemar di Kanal Banjir Timur (KBT) melalui sungai Cipinang. Melalui pemodelan QUAL2K kita dapat melihat kualitas air di kedua sungai tersebut dengan memasukan beban pencemar berupa limbah industri (point source) dan limbah rumah tangga (non point source) . Hasil dari pemodelan tersebut, nantinya akan dianalisa dengan menggunakan metode STORET untuk mendapatkan baku mutu yang ada pada hulu KBT. Dari hasil pemodelan tersebut didapatkan bahwa baku mutu di KBT adalah kelas IV dan tidak bisa dimanfaatkan sesuai dengan rencananya. Perubahan kualitas air pada KBT justru menunjukan kenaikan akibat adanya sudetan tersebut karena kualitas air di sungai Ciliwung saat banjir (kelas III, STORET -2) lebih baik dari sungai Cipinang (kelas III, STORET -4) dan didukung dengan besarnya debit yang mengalir melalui sudetan Ciliwung. Upaya dalam memperbaiki kualitas air dilakukan dengan membangun IPAL Terpadu yang diharapkan dapat memberi ruang untuk self purification dan memberi kemudahan dalam memonitor beban pencemar yang masuk sungai.

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Ciliwung tunnel is one of goverment policy to reduce peak flood in ciliwung river. This tunnel interconecting Ciliwung river toward Eastern Flood Cannal through Cipinang river. Pollutant load in Ciliwung river brought toward Eastern Flood Cannal due to Ciliwung tunnel which effect water quality at that. By using QUAL2K tools (with Industrial waste water/Point Source and domestic waste water Point Source input) we could illustrated water quality. The result of this tools used to define water quality standard at Eastern Flood Cannal by using STORET method. The result of QUAL2K show that water quality standard at Eastern Flood Cannal classified in IV Class, it’s identified that the water can’t be used. Water quality at cannal due to Ciliwung tunnel has increase because at flood condition water quality ini Ciiwung river (II Class) is better than water quality in Cipinang river (Class III) and a lot of discharge input through the tunnel so that shedding will occur. Build a integrated waste water treatment is one of efford to increase water quality ini river. It’s expected to reach an space for self purification and facilitate to control waste water quality before enter the river."