Abstract
This research examined the types and characteristics of soil, including the porosity, the water content, the void ratio, and the degree of saturation to the value of the infiltration rate in the soil located in the western part of Semarang City, Indonesia. The infiltration rate test was carried out at 49 measurement points, based on a 2×2 km2 grid division in the research area. The infiltration rate measurement in the field was carried out using a turf-tech infiltrometer. The data from the infiltration rate measurement results in the field were calculated using the infiltration rate estimation model from Kostiakov, which was further classified by the Konhke classification. The results of the infiltration rate measurement showed that the research area had infiltration rate values that varied, from very slow to very fast, with the values ranged from 0 mm/hour to 1601.33 mm/hour. The analysis results showed that the type of soil, the water content, the degree of saturation, and the porosity related to the infiltration rate in the research area. The soil type parameter had the smallest relationship to the infiltration rate with the R2 value of 0.2923. The soil porosity had the largest relationship to the infiltration rate in the research area, with an R2 value of 0.4854.
Highlights
Infiltration is one of the main components in the hydrological cycle that determines the amount of rainwater that enters the soil and becomes surface runoff; infiltration plays an essential role in the availability of groundwater [1, 2]
In The result of all parameter investigated in this study show that the R2 value has a relatively low value (
The values of the very slow to moderate infiltration rate class are spread in the Tugu District and partly in the Mijen District
Summary
Infiltration is one of the main components in the hydrological cycle that determines the amount of rainwater that enters the soil and becomes surface runoff; infiltration plays an essential role in the availability of groundwater [1, 2]. The western part of Semarang City is an ideal location to study the effect of land characteristics on the infiltration rate since it often experiences floods [3, 4]. Population growth that continues to rise, followed by changes in land use related to urbanization, influences the produced land characteristics [5]. The geological condition of the western part of Semarang is mainly composed of volcanic rocks in the north and alluvium in the south [6]. Each type of rock and soil has different physical properties related to infiltrating water [7]. Soil with sand-grain-sized composition will have greater infiltration capacity than clay due to the larger void size of the sand [8]
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