Soil Subsidence on Peat Land Due to Rainfall; Case Study of Pundu Region, Central Kalimantan

This study aims to determine the extent which rainfall affects soil subsidence on peatlands in PT. BGA. TBk., Pundu, Central Kalimantan. The research was conducted at Katari Estate, PT BGA, Tbk. Pundu Kalimantan September - December 2019. method used is survey method, consists of two stages, namely preliminary and main survey. A location while carried out obtain data, monthly data subdidence 2014 – 2018. To see relationship between land subsidence, Linear Polynomial Regressions were made lag 1, 2, 3. Regression with 1 last year this month same year, so for 2 results show that regression best annual Lag Regression. means year's has an effect subsidence. equation, Y = 0.004 X + 1.209, where R² 0.582. equation obtained from correlation (average rainfall) 2015-2018 also 2015-2018. While month's each (2015 2018), shows a low correlation.