Peningkatan Kapasitas Saluran Drainase di Blok A – F Graha Arradea, Kabupaten Bogor

Abstract

Graha Arradea menjadi salah satu perumahan yang sering kali mengalami banjir, khususnya di Blok A sampai F. Banjir terjadi karena kapasitas saluran drainase tidak mampu menampung debit limpasan. Tujuan penelitian ini adalah mengevaluasi dan merancang desain perbaikan saluran drainase di Blok A sampai F serta menyusun RAB-nya. Evaluasi dimulai dengan melakukan perhitungan curah hujan rencana menggunakan beberapa metode distribusi berdasarkan data curah hujan harian maksimum 20 tahun. Metode distribusi Log Pearson III dipilih karena memenuhi syarat parameter statistik dan uji kesesuaian dengan nilai curah hujan rencana PUH 2 tahun sebesar 128,735 mm. Nilai curah hujan rencana ini digunakan dalam analisis intensitas curah hujan dan pola distribusi curah hujan yang hasilnya dimasukkan di EPA SWMM 5.2. Hasil simulasi menunjukkan terdapat 23 conduit hampir meluap dan 6 conduit meluap. Dimensi saluran yang sebelumnya 0,3 × 0,3 m dan 0,5 × 0,5 m diubah menjadi enam variasi dimensi mulai dari 0,5 × 0,5 m hingga 1,2 × 1,2 m. Alternatif perbaikan menggunakan beton precast membutuhkan total biaya Rp844.580.000,00. Sedangkan, metode cast-in situ memerlukan biaya Rp440.400.000,00.

Graha Arradea is one of the residential areas that frequently experiences flooding, particularly in Blocks A to F. The flooding occurs because the capacity of the drainage channels is insufficient to accommodate the runoff discharge. The objective is to evaluate and design modification plans for the drainage channels in Blocks A to F, as well as to compile the budget estimation. The evaluation begins by calculating the design rainfall using several distribution methods based on 20 years of maximum daily rainfall data. The Log Pearson III distribution method was selected as it satisfies the statistical parameter requirements and goodness-of-fit tests, yielding a 2-year return period design rainfall of 128.735 mm. This design rainfall value is then utilized in the rainfall intensity analysis and the rainfall distribution pattern analysis, then the results are inputted into EPA SWMM 5.2. The simulation results indicate that there are 23 conduits nearly overflowing and 6 conduits overflowing. The channel dimensions, which were previously 0.3 × 0.3 m and 0.5 × 0.5 m were modified into six dimensional variations ranging from 0.5 × 0.5 m to 1.2 × 1.2 m. The alternative improvement using precast concrete requires a total cost of Rp844,580,000.00. Meanwhile, the cast-in-situ method requires a budget of Rp440,400,000.00.