STUDI EVALUASI SALURAN DRAINASE JALAN BANDULAN, KOTA MALANG BERBASIS EPA SWMM 5.2

Abstract

                                              ABSTRAK

Jalan Bandulan di Kota Malang mengalami permasalahan pada sistem drainase yang disebabkan oleh penumpukan sampah dan sedimentasi pasir yang menghambat aliran air serta meningkatkan potensi terjadinya banjir. Penelitian ini bertujuan untuk mengevaluasi kinerja saluran drainase di sepanjang Jalan Bandulan. Penelitian ini menggunakan metode deskriptif kuantitatif melalui analisis hidrologi dan hidraulika. Curah hujan rencana dan debit banjir rencana ditentukan berdasarkan analisis data curah hujan, sedangkan kondisi eksisting sistem drainase dievaluasi menggunakan pemodelan EPA SWMM 5.2 berdasarkan data hasil survei lapangan, geometri saluran, kondisi topografi, dan karakteristik tata guna lahan. Hasil analisis hidrologi menunjukkan bahwa debit banjir rencana untuk kala ulang 10 tahun sebesar 676,08 m³/detik. Berdasarkan hasil perhitungan, saluran SR1 memiliki debit banjir rencana (Qr) tertinggi, yaitu sebesar 5,2823 m³/detik. Hasil evaluasi menggunakan perangkat lunak EPA SWMM 5.2 menunjukkan bahwa tiga saluran, yaitu SR2, SR3, dan SR4, belum mampu mengalirkan debit banjir rencana pada kondisi eksisting. Untuk mengatasi permasalahan tersebut, dilakukan redesain dimensi saluran menggunakan metode trial and error, serta penambahan grill inlet dan catch basin guna meningkatkan efektivitas sistem drainase. Hasil simulasi setelah redesain menunjukkan bahwa debit puncak terjadi pada pukul 13.00, dan saluran SR2, SR3, serta SR4 telah mampu mengalirkan debit banjir rencana tanpa mengalami limpasan (overflow).

Kata kunci: Drainase, Evaluasi, EPA SWMM 5.2.

                                                     ABSTRAK

Street Bandulan in Malang City is experiencing problems with its drainage system caused by the accumulation of trash and sand sedimentation, which obstruct water flow and increase the potential for flooding. The purpose of this study is to examine and assess the performance of the drainage channels along Street Bandulan. This study employed a quantitative descriptive method through hydrological and hydraulic analyses. Design rainfall and design flood discharge were determined using rainfall data analysis, while the existing drainage system was evaluated by modeling it with EPA SWMM 5.2 based on field survey data, channel geometry, topography, and land-use characteristics. The results of the hydrological analysis show that the design flood discharge for a 10-year return period is 676,08 m³/sec. Based on the calculations, channel SR1 has the highest design flood discharge (Qr), at 5,2823 m³/sec. Three channels—SR2, SR3, and SR4—cannot handle the design flood discharge, according to an assessment using EPA SWMM 5.2 software. To address this issue, the channel dimensions were redesigned using the trial-and-error method, and grates and catch basins were added to improve the drainage system’s effectiveness. Following the redesign, simulation results revealed that the peak discharge happened at 1:00 PM and that channels SR2, SR3, and SR4 could transmit the design flood discharge without overflowing.

Keyword: Drainage, Evaluation, Epa SWM 5.2