Determination of water infiltration in bioretention with double ring infiltrometer

Abstract

The increasing land developments have reduced the natural surface porosity, leading to more frequent and severe flooding or runoff in urban areas. Therefore, encourage the design of empty spaces to increase the potential to reduce flooding by increasing water infiltration into the soil layer. This type of area is known as bioretention. However, to measure the area's infiltration, it is necessary to find a proper field experiment. A preliminary investigation found that agriculture uses the double-ring infiltrometer for infiltration measurements. Therefore, this research is an experiment to measure the water seepage rate of a double-ring infiltrometer to test the ability to support rainwater of bioretention in the field. The results demonstrated that a random convenient collection data from collecting infiltration data of bioretention in Muang District, Chiang Mai Province 4 times, differing in 4 months, including October, November, December, and February. The study found that the data were divided into October and February, with an average seepage rate of 8.0 mm/h, behaving like sandy soil. In November and December, the second group had an average seepage rate of 30.6 mm/h. behaves like clay loam. In addition to calculating the filtration rate, the results of this study also proved that the double-ring infiltrometer seepage rate measurement device could be applied to determine the efficiency of the design of the bioretention. This research will help support the design of bioretention to reduce the problem of flooding in urban areas effectively.