UMBUMB

SINERGISINERGI

Cascade Citarum Reservoirs, located in the western part of the island of Java in Indonesia, cover the main building dams, hydropower, irrigation facilities and other supporting facilities. The study aimed to evaluate the characteristics of the existing condition of the downstream reservoir, including the relation of the water quality and quantity, by using a conceptual model of the Citarum Cascade Reservoir management. The study mostly used the secondary data acquired from Indonesia Power, the Management Bureau of Cirata Dam (BPWC), Perum Jasa Tirta II (PJT) Jatiluhur, the Management Bureau of the Citarum-Ciliwung River Basin (BPDAS Citarum-Ciliwung), and the Water Resource Management Agency of the West Java Province. This research aims to predict the discharge plans R5 and R20 using the Weibull method and the uncertainty of future discharge using the continuous model approach. Furthermore, the multivariate statistical test will analyse the linkage of water quality in reservoir management. To solve the problem of the allocation of the raw water discharge to fulfil the water requirement in the downstream area was developed proportionally in this study, in which the raw water discharge allocations were 46.92 m3/sec, 91.9 m3/sec and 97.95 m3/sec for Saguling, Cirata, and Jatiluhur, respectively. The tests to determine the relationship between the discharge and water quality using the Discriminant test indicated that the discharge correlates strongly with the parameters such as NH3, BOD and COD.

The allocation of raw water flow calculation for the Citarum Cascade Reservoir to meet the needs of downstream drinking water for the DKI Jakarta area is proportional, whereas the allocation of drinking water availability calculations in the Citarum Cascade Reservoir results is 59.02 m3/sec, which can be used as a drinking water discharge in the DKI Jakarta and surrounding areas.COD, BOD, and Pb, have exceeded the drinking water quality standard set by the Indonesian Ministry of health.The waters of the Citarum Cascade Reservoir have been polluted by organic matter that is easily biodegradable and unfit for use as a source of raw drinking water.Physical, chemical, and biological treatment is needed if it will be used as a source of drinking water.

Berdasarkan penelitian ini, terdapat beberapa saran penelitian lanjutan yang dapat dikembangkan untuk memperdalam pemahaman mengenai pengelolaan waduk kaskade Citarum dan dampaknya terhadap kualitas air serta ketersediaan air baku. Pertama, penelitian dapat difokuskan pada pengembangan model hidrologi yang lebih canggih, dengan mempertimbangkan faktor-faktor perubahan iklim dan penggunaan lahan yang berkelanjutan. Model ini dapat digunakan untuk memprediksi perubahan pola curah hujan dan dampaknya terhadap debit sungai, sehingga dapat membantu dalam perencanaan pengelolaan waduk yang lebih adaptif. Kedua, penelitian dapat dilakukan untuk mengidentifikasi sumber-sumber polusi air yang paling signifikan di wilayah DAS Citarum, serta mengembangkan strategi mitigasi yang efektif untuk mengurangi dampak polusi terhadap kualitas air. Hal ini dapat melibatkan penggunaan teknologi pengolahan air yang ramah lingkungan, serta penerapan praktik pertanian dan industri yang lebih berkelanjutan. Ketiga, penelitian dapat difokuskan pada pengembangan sistem peringatan dini (early warning system) untuk potensi banjir dan kekeringan di wilayah DAS Citarum. Sistem ini dapat memanfaatkan data hidrologi dan meteorologi secara real-time, serta menggunakan model prediksi untuk memberikan peringatan dini kepada masyarakat dan pemerintah, sehingga dapat mengurangi risiko bencana dan dampak negatifnya.

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