Analisis Laju Infiltrasi di Penggunaan Lahan di Kampus 2 USU Kwala Bekala

Abstract

Infiltration rate is the rate at which water enters the soil. Infiltration is an important process in the hydrological cycle that determines the amount of rainwater that can enter the soil and contribute to groundwater recharge. Different land uses have a significant effect on infiltration rates, depending on the condition of soil properties such as texture, moisture content, porosity, organic matter, bulk density. This study aims to analyze infiltration rates in different types of land use at USU Kwala Bekala Campus 2, including palm oil, agriculture, buildings, and arboretum. Infiltration measurements were conducted in the field using a double ring infiltrometer. The Horton and Kostiakov model was tested to determine the infiltration rate. The results of the model were then tested using the Nash-Sutchliffe Efficiency Error (NSE) and Root Mean Square Error (RMSE) tests. The results showed that the highest infiltration rate occurred in agricultural land and arboretum which amounted to 11.06 cm/hour and 3.1 cm/hour, while building land and palm oil showed the lowest infiltration rate of 1.34 cm/hour and 1 cm/hour. The factor that most strongly affects infiltration is the clay fraction. Sand fraction, C-organic and moisture content have an insignificant relationship and bulk density has a significant relationship with F0 and Fc. The NSE and RMSE results show that the Horton model has a more effective predicted value than the Kostiakov model.