The Use of Tandem-X Image for Inundation Potential Research By Discharge River Forecast

Kediri District is drained by rivers during the year, for the examples Brantas River, Bruni River, Lanang River, and Sempu River.On the rains, that areas have flood potential. The research use Rational Method for calculate the maximum streamflows from the river. The formula is : Qmax = CIA / 360 m3 /sec. TanDEM-X satellite image can be used for determine one of maximum streamflow factor. Geographic information system used as a tool for calculate maximum streamflow parameter in a catchment areas. Run off coefficient (C) is given by land cover, slope, and soil texture parameters. The maximum rainfall (I) on Rational Method is calculated by Mononobe formula. Then, the area research is devided as some sub catchment areas. From this research, runoff coefficient value in the research area with the smallest value is 0.34 on Surat sub-catchment area and the largest is 0.6 on Lanang sub-catchment area. Values obtained debit, the smallest is 109.70 m3 /sec on Surat sub-catchment area and the largest is 221.64 m3 /sec on a Bruno sub-catchment area. The result of this research is the information of inundation potential area, ie Lanang sub-catchment area with excess of discharge river as 19.02 m3 /sec