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In determining the value of the curve number, Indonesia does not yet have a Hydrologic Soil Group (HSG) map, so it is necessary to research HSG classification in each region. Especially on the north coast of Papua, the problem of surface runoff, which has the potential to become inundated, is quite a serious concern because several areas with the highest population density and urban settlements are in this area. Therefore, HSG studies and Curve Number (CN) values are needed to support predictive analysis of surface runoff in an area. The purpose of this study is to analyse the suitability of the formulation in calculating the hydraulic conductivity and CN value with the Green-Ampt Infiltration Model approach to the results of soil texture analysis and HSG obtained from soil samples in the Sorong area. The research stages are preparing the required materials and equipment, taking soil samples in the field, and activities in the laboratory. First, we analysed data to determine the soil's physical properties, texture, and Hydrologic Soil Group (HSG). Then, we can interpret the hydraulic conductivity and CN value. The last step is to analyse the relationship between hydraulic conductivity and curve number for soil data in Sorong and compare the CN value to conclude the suitability of the formulation used with the data obtained. The graphical analysis result shows hydraulic conductivity and the curve number value calculated with the Green-Ampt Infiltration Model is more suitable for solving Muntohar Ksat = K than using the Bouwer assumption in calculating the CN value. [ABSTRACT FROM AUTHOR]

In the discussion of water balance to maintain the sustainability of water resource management in a coastal area, the infiltration parameter is one of the important studies of hydrological process dynamics. It should be the theme of an in-depth study. This research is a preliminary study on the review of the value of the infiltration rate in the coastal area of Sorong City, with the primary objective of the study, is to analyze the value of the infiltration rate on the influence of soil properties in the coastal area of Sorong City, comparing it with the value of infiltration rates in other coastal areas in Indonesia and in other tropical areas abroad whose values are obtained from literature studies, as well as analyzing the effect of soil properties on infiltration capacity in urban areas with tropical coastal climates. Field inspection using a sand cone and double-ring infiltrometer continued with laboratory tests, including soil density, infiltration capacity, and soil moisture content. The result of the research is that the value of infiltration capacity in the coastal area of Sorong City is dominated by the category very rapid infiltration (81.82% of the infiltration value is above 25 cm/hour), the infiltration rate for cities in tropical coastal areas is included in the very rapid infiltration category, and is influenced by the value of water content (R2 = 0.3333) and porosity (R2 = 0.3506), while density has a less significant effect (R2=0.0875). [ABSTRACT FROM AUTHOR]