<![CDATA[Purwantoro RW 23 Subdistrict, Blimbing Subdistrict, Malang often inundation due to changes in land use. In dealing with this problem, since 2013 RW 23 has built 6 injection wells. This study aims to determine the existing condition, follow-up and effectiveness of injection wells at the research site. Therefore, analysis is required using EPA SWMM 5.1 model to describe the simulation of inundation reduction. Therefore, analysis is required using EPA SWMM 5.1 model to describe the simulation of inundation reduction. For model calibration is done by RMSE method for a return period of 2 years of 9.9%, and for a return period of 5 years of 11%, while for a return period of 10 years of 12%. The simulation results in SWMM 5.1 application showed that after the injection well can absorb rainwater runoff for return period of 2, 5, and 10 years. However, it is necessary to add 4 injection wells for a return period of 2 years, and 5 injection wells for a return period of 5 and 10 years. The effectiveness value of the application of injection wells using rain barrels in SWMM 5.1 applications obtained results for a return period of 2 years of 85.714% - 97.931% with an average effectiveness of 92.028%, and a return period of 5 years of 88.889% - 98.378% with an average effectiveness of 93.562%, while a return period of 10 years of 90.909% - 98.372% with an average effectiveness of 94.161%. Wilayah Kelurahan Purwantoro RW 23, Kecamatan Blimbing, Kota Malang sering terjadi genangan akibat dari perubahan tata guna lahan. Dalam menangani permasalahan ini, Sejak tahun 2013 RW 23 telah membangun sumur injeksi sebanyak 6 buah. Penelitian ini bertujuan untuk mengetahui kondisi eksisting, tindak lanjut dan efektivitas sumur injeksi di lokasi penelitian. Maka dari itu, diperlukan analisis menggunakan model EPA SWMM 5.1 untuk menggambarkan simulasi pengurangan genangan. Untuk kalibrasi model dilakukan dengan metode RMSE dengan kala ulang 2 tahun sebesar 9,9 %, kala ulang 5 tahun sebesar 11%, dan kala ulang 10 tahun sebesar 12%. Hasil simulasi pada aplikasi SWMM 5.1 menunjukkan bahwa perlu penambahan sumur injeksi sebanyak 4 sumur injeksi di kala ulang 2 tahun, 5 sumur injeksi di kala ulang 5 dan 10 tahun. Nilai rata-rata efektivitas penerapan sumur injeksi dengan menggunakan tampungan hujan pada SWMM 5.1 didapatkan hasil untuk kala ulang 2 tahun sebesar 92,028%, dan untuk kala ulang 5 tahun sebesar 93,562%, sedangkan untuk kala ulang 10 tahun sebesar 94,161%.]]>
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