Electronic Theses and Dissertation

Desa Jeumpet Ajuen merupakan salah satu desa di Kecamatan Darul Imarah, Kabupaten Aceh Besar, yang mengalami banjir cukup parah pada 2017 lalu dengan ketinggian air bervariasi antara 20-50 cm. Banjir tersebut terjadi karena saluran drainase tidak mampu menampung debit intensitas hujan yang tinggi, sehingga mengakibatkan luapan. Penelitian ini bertujuan untuk menganalisis saluran drainase di Desa Jeumpet Ajuen terhadap debit banjir rencana kala ulang Q_5, Q_10, dan Q_25menggunakan pemodelan Storm Water Management Model (SWMM) 5.2 serta untuk mengetahui kinerja saluran drainase eksisting di lapangan. Objek pada penelitian ini adalah saluran primer kiri dan kanan. Metode yang digunakan pada penelitian ini adalah metode rasional modifikasi dan pemodelan SWMM 5.2 untuk menganalisa terjadinya genangan dan kapasitas saluran primer. Hasil dari simulasi tersebut menunjukkan kondisi saluran drainase eksisting mengalami luapan pada beberapa titik. Volume luapan terbesar terjadi pada saluran kanan titik S-9 Ka nilai Q_s sebesar 5.413 m³/det sedangkan nilai banjir rencana mencapai Q_2 4,638 m³/det, Q_5 6,211 m³/det, Q_10 7,213 m³/det, dan Q_25 8,440 m³/det dengan lama luapan lebih dari 4 jam. Saluran kiri mengalami titik kritis pada S-8 Ki debit banjir Q_2 4,528 m³/det, Q_5 6,064 m³/det, Q_107,041 m³/det, Q_258,239 m³/det. Hasil dari analisis dan simulasi SWMM bahwa perbandingan antara nilai kapasitas saluran (Q_s) dan debit banjir rencana (Q), kondisi saluran mengalamiQ_s < Q hal ini menunjukkan bahwa saluran tidak dapat menampung nilai debit banjir rencana sehingga terjadi luapan dan banjir lokal.

Jeumpet Ajuen Village is one of the villages located in Darul Imarah Subdistrict, Aceh Besar Regency, which experienced severe flooding in 2017 with water levels ranging from 20 to 50 cm. The flooding occurred due to the inability of the drainage channel to accommodate the high rainfall intensity, resulting in overflow. This study aims to analyze the performance of the drainage channels in Jeumpet Ajuen Village against design flood discharges with return periods of Q₅, Q₁₀, and Q₂₅ using the Storm Water Management Model (SWMM) version 5.2, as well as to evaluate the condition of the existing drainage system in the field. The objects of this study are the left and right primary drainage channels. The methods used in this study are the modified rational method and SWMM 5.2 modeling to analyze inundation events and channel capacity. The simulation results show that the existing drainage channels overflowed at several locations. The largest overflow volume occurred in the right channel at S-9 Ka, with a channel capacity (Qₛ) of 5.413 m³/s, while the design flood discharges were Q₂ = 4.638 m³/s, Q₅ = 6.211 m³/s, Q₁₀ = 7.213 m³/s, and Q₂₅ = 8.440 m³/s, with the overflow lasting for more than four hours. A critical point in the left channel was observed at S-8 Ki, with design discharges of Q₂ = 4.528 m³/s, Q₅ = 6.064 m³/s, Q₁₀ = 7.041 m³/s, and Q₂₅ = 8.239 m³/s. The analysis and SWMM simulation results indicate that the capacity of the drainage channels (Qₛ) is lower than the design flood discharges (Q), meaning that the existing channels are unable to accommodate the expected flow, thus causing overflow and local flooding