Abstract:
The problem of flooding is something that often occurs during the rainy season, and its coverage area has expanded
not only to areas that are used to flooding but also to the surrounding areas. South Kalimantan Province’s Hulu Sungai
Tengah Regency and a number of its districts had a flood disaster to start the year 2021. Tilahan or Hanntak is the Meratus
Mountains Region which is the origin of the floods due to the overflow of the Benawa River and the continuing flow of the
Barabai River. The practice of illegal logging in the Meratus Mountains Region is still rife. On January 14, 2021, extreme
rainfall occurred, which caused flooding in the South Kalimantan region. Low water absorption into the ground is one of the
causes of flooding when heavy rains occur for a long duration. In this study, infiltration in the Hantakan Sub-District, Hulu
Sungai Tengah, will be measured to examine the infiltrated water rate. Primary data from a direct survey of the research
region was collected to assess the infiltration rate, and the Horton technique was used to analyze it. Based on the test results
and the results of the analysis of counts at nine points, in test 1, there were four points with very slow classification, two points
with moderate classification, two points with a rather fast classification, and one point with fast classification. Whereas in test
2, there were five points classified as very slow, one as medium, and three fast.
