<![CDATA[Abstrak-Telah dilakukan penelitian tentang porositas berdasarkan variasi ukuran butir batuan kawasan Karst Maros-Pangkep. Tujuan dari penelitian ini adalah untuk mengetahui gambaran nilai porositas batuan di Kawasan Karst Maros-Pangkep berdasarkan variasi ukuran butir dan menentukan pengaruh ukuran butir terhadap porositas batuan di Kawasan Karst Maros-Pangkep. Proses dimulai dari penentuan ukuran butir menggunakan lima macam saringan/ayakan, yaitu dengan nomor 50 mesh, 30 mesh, 16mesh, 10 mesh dan 4 mesh. Porositas ditentukan dengan menggunakan metode penimbangan. Setelah perhitungan ukuran rata-rata butir didapat selanjutnya dihubungkan dengan porositas dengan metode analisis regresi. Berdasarkan perhitungan statistik diperoleh persamaan regresi linear batuan Karst Maros-Pangkep, yaitu Y=15,00-2,82X dengan R2.=0,78. Diperoleh pengaruh ukuran butir terhadap porositas batuan kawasan karst Maros-Pangkep bernilai negatif artinya ukuran butir berbanding terbalik dengan porositas batuan di kawasan karst Maros-Pangkep. Semakin kecil ukuran butir maka porositas semakin besar dan semakin besar ukuran butir porositas semakin kecil. Kata kunci : Porositas, ukuran butir, batuan karst Pangkep, batuan karst Maros Abstrak-Research on porosity has been carried out based on variations in grain size of the Maros-Pangkep Karst area. The purpose of this study was to describe the value of rock porosity in the Maros-Pangkep Karst Region based on grain size variations and to determine the effect of grain size on rock porosity in the Maros-Pangkep Karst Region. The process starts from determining the grain size using five kinds of sieves, namely with numbers 50 mesh, 30 mesh, 16mesh, 10 mesh and 4 mesh. Porosity is determined using the weighing method. After calculating the average grain size obtained, it is then connected to the porosity by using the regression analysis method. Based on statistical calculations obtained linear regression equation Maros-Pangkep karst rock, namely Y=15.00-2.82X with R2.=0.78. The effect of grain size on the rock porosity of the Maros-Pangkep karst area is negative, meaning that the grain size is inversely proportional to the porosity of the rocks in the Maros-Pangkep karst area. The smaller the grain size, the larger the porosity and the smaller the porosity. Keywords: porosity, grain size, Pangkep karst rock, Maros karst rock]]>
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