Investigation Of Water Content, Soil Density, Hydraulic Conductivity And Matrix Suction On Infiltration Rate In Padang City – Indonesia

Abstract

Floods and soil erosion are slow processes of water absorption. One reason is the physical properties of the soil. This research aims to determine the effect of water content, soil density, hydraulic conductivity, and suction matrix on the infiltration rate in Padang City, Indonesia. This research uses the Kostiakov method. The research area is divided into six watersheds, namely the Batang Arau, Timbalum, Sungai Pisang, Batang Kuranji, Batang Air Winter Watershed, and Batang Kandis watersheds. Carried out in October–December 2022. Test results were processed using simple regression analysis using the IBM version of SPSS Analysis of Variance (ANOVA). Analysis shows that the infiltration rate decreases with increasing water content and soil density. For every 1% increase in water content, the infiltration rate decreases by 0.127 cm/minute, and for every 1 g/cm3 increase in soil density, the infiltration rate decreases by 2.848 cm/minute. Meanwhile, the infiltration rate increases with increasing hydraulic conductivity and matrix suction. Every increase in the hydraulic conductivity value by 1 cm/second will increase the infiltration rate by 27.732 cm/minute, and every increase in the suction matrix value by 1 CB will increase the infiltration rate by 0.006 cm/minute.