ANALISIS POLA OPERASI WADUK BENDUNGAN CIAWI (DRY DAM) UNTUK PENGENDALIAN BANJIR (Studi Kasus: Bendungan Ciawi, Desa Cipayung, Kecamatan Ciawi, Kabupaten Bogor)

FERDIAN, REZI (2020) ANALISIS POLA OPERASI WADUK BENDUNGAN CIAWI (DRY DAM) UNTUK PENGENDALIAN BANJIR (Studi Kasus: Bendungan Ciawi, Desa Cipayung, Kecamatan Ciawi, Kabupaten Bogor). S1 thesis, Universitas Mercu Buana Jakarta.

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Abstract

Frequent “dispatch” floods from Bogor in the DKI Jakarta area caused by the overflowing of the Ciliwung river have caused the Central Government to build the Ciawi dam in the upper reaches of the Ciliwung River Basin. The existence of this reservoir is expected to be able to accommodate water from upstream and can become a potential source of raw water in the area. This study aims to determine flood control solutions from the construction of the Ciawi Dry Dam. The data required in the process of analyzing flood control at the Ciawi Dry Dam is primary data in the form of map data of the Upper Ciliwung Watershed. As well as secondary data in the form of rainfall data and existing data on the Ciawi Dam project. From the results of data calculations that have been done, the maximum possible rainfall (PMP) is obtained, which is 887.78 mm / day. Based on the results of the flood discharge analysis using the HSS Nakayasu method for the return period of 2, 5, 10, 20, 25, 50, 100, 1000 years and the PMF is 332,8804 m3 / s, 419,110 m3 / s, 522,4371 m3, respectively. / sec, 594,8906 m3 / s, 617,8644 m3 / s, 688,6475 m3 / s, 758,9074 m3 / s, 992,2582 m3 / s and 2367,2740 m3 / s. Based on the results of the calculation of flood control, the ΔQ results are 4,302,517.67 m3. While the results of the time difference between the peak discharge outflow and inflow (Δt) for 2 hours. Keywords: Ciawi Dam, Dry Dam Ciawi, Upper Ciliwung Watershed, PMP, HSS Nakayasu, Outflow, Inflow. Seringnya banjir “kiriman” dari Bogor di wilayah DKI Jakarta yang disebabkan oleh meluapnya sungai Ciliwung menyebabkan Pemerintah Pusat membangun bendungan Ciawi di bagian hulu sungai DAS Ciliwung. Keberadaan waduk ini diharapkan dapat menampung air dari hulu dan dapat menjadi potensi sumber air baku di wilayah tersebut. Studi ini bertujuan untuk mengetahui solusi pengendalian banjir dari pembangunan Bendungan Kering (Dry Dam) Ciawi. Data yang diperlukan dalam proses analisa pengendalian banjir pada Bendungan Kering (Dry Dam) Ciawi adalah data primer berupa data peta DAS Ciliwung Hulu. Serta data sekunder berupa data curah hujan dan data eksisting proyek Bendungan Ciawi. Dari hasil perhitungan data yang telah dilakukan, di dapat hasil besar curah hujan maksimum yang mungkin terjadi (PMP) yaitu sebesar 887,78 mm/hari. Berdasarkan hasil analisis debit banjir dengan metode HSS Nakayasu untuk kala ulang 2, 5, 10, 20, 25, 50, 100, 1000 tahun dan PMF berturut-turut adalah 332,8804 m 3 /det, 419,110 m3 /det, 522,4371 m3 /det, 594,8906 m3 /det, 617,8644 m3 /det, 688,6475 m3 /det, 758,9074 m3 /det, 992,2582 m3 /det dan 2367,2740 m3 /det. Berdasarkan hasil perhitungan pengendalian banjir didapatkan hasil ΔQ sebesar 4.302.517,67 m3 . Sedangkan hasil selisih waktu debit puncak outflow dan inflow (Δt) selama 2 jam. Kata kunci: Bendungan Ciawi, Dry Dam Ciawi, DAS Ciliwung Hulu, PMP, HSS Nakayasu, Outflow, Inflow.

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