Abstract
Disasters those related to rainfall, will always come unexpectedly which can make huge potential of risk to human and facilities. Rainfall contribute a benefit and disaster to us, so we have to provide some research about the relationsip of rainfall and disaster. This research produce the information related to application of x-band radar data which have combination from soil water index. It shows the calculation of water content in soil layer by using x-band radar data. The rainfall dataset is extracted from June 2019 until June 2020. SWI can be used as preliminary information and works as a database for monitoring and observation tools for Boyong drainage area. The record of occurence sediment movement on 20th October 2019 proves in that day, the condition of soil water index reach maximum values with 80,28 mm and there is a small occurence of sediment movement around that month. The subsequent conctancy of SWI needs to be paid attention for possibility of disaster. As rainfall intensity reach the highest values, soil water index will also increase. A higher value of SWI show a higher risk of sediment disaster initiation.
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