Abstract: The cause of Banjar Regency frequent flooding is because the low location of Banjar Regency from above sea level causes the flow of water on the ground surface to be hampered. As a result, some areas are always inundated (29.93%) while others (0.58%) are periodically inundated. Areas that are categorized as prone to periodic flooding are on a slope. This area consists of Sungai Pinang, Mataraman, Astambul, Gambut, Aranio, and Pengaron sub-districts. The area affected by the flood is estimated to be 104.53 hectares or a potential flood of 23.31. The Astambul area has a lot of waste and plants that can be used as absorbents to improve physical, chemical and bacteriological qualities by adsorption of gases and certain chemical compounds or their selective adsorption properties, depending on the size or volume of pores and surface area because the absorption of activated carbon is very large, which is 25-1000% by weight of activated carbon.