Analisis Spasial Kapasitas Infiltrasi DAS Citarum

Abstract

Degradasi lahan di Daerah Aliran Sungai (DAS) Citarum berimplikasi mengurangi kemampuan infiltrasi dan meningkatkan tingkat kekritisan lahan. Penelitian ini bertujuan menganalisis tingkat kekritisan lahan dan kapasitas infiltrasi DAS Citarum. Tingkat kekritisan lahan dianalisis menggunakan pendekatan penilaian tingkat kekritisan lahan yang merujuk pada Peraturan Menteri Lingkungan Hidup dan Kehutanan Nomor 10 Tahun 2022, dan kapasitas infiltrasi dianalisis menggunakan pendekatan Soil Conservation Service-Curve Number (SCS-CN). Hasil penelitian menunjukkan lahan kritis di DAS Citarum seluas 3.269,1 km² (47,3%), sisanya 52,7% (3.636,6 km²) lahan tidak kritis. Lahan kritis di daerah resapan sebesar sebesar 416,1 km² (32%). Kapasitas Infiltrasi DAS Citarum umumnya sedang (56–110 mm/bulan) pada seluruh wilayah DAS dan daerah resapan, yang tersebar di lahan kritis dan tidak kritis. Volume infiltrasi di daerah resapan DAS Citarum sebesar 124,3 106m³/bulan (21,8%).

Land degradation in the Citarum watershed reduces infiltration capacity and increases land criticality. This study aims to analyze the criticality level and infiltration capacity in the Citarum watershed. The criticality level of the land was analyzed using the land criticality assessment method based on the Regulation of the Minister of Environment and Forestry No. 10 of 2022, while the infiltration capacity was analyzed using the Soil Conservation Service–Curve Number (SCS-CN) method. The results indicate that critical land in the Citarum watershed covers an area of 3269,1 km² (47.3%), whereas the remaining 52,7% (3636.6 km²) is classified as non-critical land. Within the recharge area, critical land occupies 416,1 km² (32%). The infiltration capacity of the Citarum watershed is generally moderate (56–110 mm/month) across both critical and non-critical lands within the watershed and recharge area. The infiltration volume in the Citarum watershed recharge area is 124,3 106 m³/month (21.8%).