AGRATAMA, RADI (2020) ANALISIS KAPASITAS TAMPUNGAN EFEKTIF DAN NERACA AIR WADUK DRY DAM CIAWI KABUPATEN BOGOR JAWA BARAT. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
Reservoir storage capacity can be calculated and analyzed using several methods, including using the ripple method and using software Surfer, Global Mapper, AutoCAD, and others. The use of AutoCAD software and Global Mapper in calculating reservoir storage capacity is expected to increase calibration accuracy and effectiveness calculation time. Apart from calculating the effective storage capacity, hydrological analysis is carried out with a purpose to knowing when the bottom conduit conditions are full and water will start filling the reservoir. This condition can be seen by looking at the monthly water balance graph in terms of the QPMF discharge. Based on calculations with the AutoCad software, the effective storage capacity of the Ciawi dry dam is at an elevation of ± 557 m with a storage volume of ± 6558106.026 m3 and an inundation area of 353155.075 m2. From the water balance analysis, it is known that the largest water availability occurred in January at 3307.71 m3/s, and the largest water loss occurred in March at 1397.54 m3/s, and from the water balance graph in terms of flood discharge QPMF it can be concluded that the outflow discharge is not greater than the inflow discharge, so that the dry dam cannot be used for public facilities. Keywords : Dry dam, Effectivity reservoir capacity, Water loss, Water availability, Water Balance Kapasitas tampungan waduk dapat dihitung dan dianalisa dengan menggunakan beberapa metode, antara lain dengan menggunakan metode ripple dan menggunakan bantuan perangkat lunak (software) Surfer, Global Mapper, AutoCAD, dan lain-lain. Penggunaan software AutoCAD dan Global Mapper dalam perhitungan kapasitas tampungan waduk diharapkan dapat menambah ketelitian kalibrasi serta efektivitas waktu perhitungan. Selain perhitungan kapasitas tampungan efektif, analisa hidrologi dilakukan dengan tujuan untuk mengetahui kapan kondisi bottom conduit penuh dan air akan mulai mengisi waduk. Kondisi tersebut dapat diketahui dengan melihat grafik neraca air bulanan yang ditinjau dari debit QPMF. Berdasarkan perhitungan dengan software AutoCad lengkung kapasitas tampungan efektif dry dam Ciawi berada pada elevasi ±557 m dengan volume tampungan sebesar ±6558106,026 m3 dan luas genangan 353155,075 m2. Dari analisis neraca air yang dilakukan, diketahui ketersediaan air terbesar terjadi pada bulan Januari sebesar 3307,71 m3/s, dan kehilangan air terbesar terjadi pada bulan Maret sebesar 1397,54 m3/s, dan dari grafik neraca air yang ditinjau dari debit banjir QPMF dapat disimpulkan tidak terjadi kondisi debit outflow lebih besar dari debit inflow, sehingga tubuh bendungan tidak dapat dipakai untuk fasilitas umum. Kata Kunci : Bendungan kering, Kapasitas tampungan efektif, Kehilangan Air, Ketersediaan Air, Neraca air
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