Mapping of infiltration rate using Horton method in Kedungwaru Village, Karangsambung, Kebumen, Central Java

Abstract

Rainwater that falls and is absorbed by the soil is called infiltration. Infiltration is the process of entering water into the soil in mm / hour and if the infiltration rate is lower than the intensity of rainfall, it will result in runoff which is the initial process of soil erosion. Erosion is a process or event of loss of the upper surface layer, both due to water and wind. The negative impact of erosion alone causes a decrease in productivity and land hunting in an area. This is very detrimental to the people living in the agricultural sector such as residents in Kedungwaru Village. Kedungwaru Village, Geographically located at coordinates 109 ° 37'30 "- 109 ° 45'00" BT and 7 ° 30'00 '- 7 ° 37'30' 'LS. Analysis of the infiltration rate needs to be done in the area to find out the area that occurs runoff in Kedungwaru Village. The parameter value of the infiltration rate measured can be used to control the condition of the runoff area. This study uses a Double Ring Infiltrometer as a measure of infiltration rate and with the Horton Method, the value of infiltration capacity in an area can be calculated from the results of field measurements. The results of the second analysis of the calculation of the infiltration rate and rainfall intensity were compared and made a map showing the areas that occur with rain runoff. The results of the study show that the village of Kedungwaru has varying infiltration rates, from the lowest of 77,216 mm / hour to the highest of 560,816 mm / hour. With the value of rainfall intensity obtained at 218.27 mm / hour, it shows if there is an area that occurs runoff in Kedungwaru Village and recommendations should be made to avoid erosion.