Analisis Laju Infiltrasi Pada Sub Das (Daerah Aliran Sungai) Siak Kota Pekanbaru (Studi Kasus: Das Senapelan Dan Das Sago)

Abstract

Pekanbaru city development is experiencing rapid development due to population and economic growth, this has made land use become more dense. The construction of a dense infrastructure makes the process of infiltration or absorption of water into the ground slower. As a result of the development of infrastructure, the surface runoff is large and can cause flooding. An infiltration rate study was conducted to be used as a reference for conservation measures and overcome the problem of magnitude of surface runoff. Infiltration rate measurement using a double ring infiltrometer and Horton equation analysis method is performed to determine the infiltration rate. Measurement of infiltration rate in the field is based on procedures in SNI 7752: 2012. Calculation of infiltration rate analysis aims to determine the value of infiltration capacity and infiltration rate in the area under study. At the 6 research location points, the largest infiltration capacity at the research site 2 was 90 mm / hour and the smallest infiltration capacity at the research site 3 and 6 was 30 mm / hour. Infiltration rate analysis using the Horton equation method obtained the highest infiltration rate at study point 2 which is 76.38 mm / hour and the lowest infiltration rate at research point 6 is 18 mm / hour. Classification of infiltration rate was conducted based on the analysis of the total infiltration volume, the largest value was at point 4 at 27.46 mm with a constant decrease time at 1.67 hours and the smallest infiltration volume value was at point 6 at 12.73 mm with a time of constant decrease at 1.17 hours. Based on the U.S. Soil Conservation, at 6 testing points has infiltration rate which is rather slow and moderate.
Keywords: infiltration, horton’s method, surface runoff