Study determination of infiltration rate in permeable soils with flooding method - Turf tech infiltrometer in Universitas Brawijaya Campus II - Dieng

The process of infiltration rate reading and soil sampling was carried out in the Campus II Area of Universitas Brawijaya (Dieng) using the Turf-Tec Infiltrometer, implemented in 8 points. At all points, the process of reading the infiltration rate is done once and once the soil sampling is used to determine the characteristics of the soil in the sample of the point in question. The process of analyzing soil characteristics was carried out at the Soil and Ground Laboratory of the Water Engineering Department. Soil samples used in the analysis of soil characteristics are soil samples that were previously taken from the eight infiltration rate readings in Campus II Universitas Brawijaya (Dieng). The daily rainfall data used comes from Department of Water Resources Engineering Rain Station – Universitas Brawijaya, BMKG Sukun Rain Station, and BMKG Ciliwung Rain Station. To determine the rate of infiltration that occurs based on the flooding method of permeable soil in this study using the Horton Model, Holtan Model, and Philip's Model. According to the testing of specific gravity that has been done, it can be concluded that there are 2 classes of soil types based on the classification of specific gravity, namely: sand (point 4, point 5, point 6, and point 7) and organic clay (point 1, point 2, point 3 , and point 8). According to the calculation of the grain size that has been done and shown through a filter analysis graph image at each point that shows the overall trend that ends in the type of sand (sand) indicates that the overall point has a type of sand. The hydrometer test is divided into 2 parts, namely: the hydrometer calibration process and the hydrometer testing calculation process. Based on the analysis of soil porosity, it can be concluded that the porosity value has a relationship with the water content value where the smaller the moisture content value at a point, the smaller the porosity value in the soil will be. From the analysis of the distribution of soil characteristics, infiltration rate and R24 rain histogram, it was found that inundates characteristics occurred in the study area.