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Seunagan, Nagan Raya District is a lowland area that often-experiencing flooding that comes from the overflow of the Krueng Seunagan River. This condition affects the activity of peoples living in the river environment. Based on the problems occurred, this research is conducted to determine the characteristics of river hydrograph in the Watershed Krueng Seunagan, based on visible river condition so it is necessary to predict how big of river flow discharge with upstream and downstream hydrographs on the Seunagan River Basin and variation of coefficient value K and X in Muskingum method Chunge. Primary data in use in the form of Speed and Depth of the river. Watershed maps and Land Use maps are used as secondary data. The results showed the average peak discharge in upstream is 17.26 m3/s, while the peak discharge at downstream is 11.00 m3/s. The peak discharge is precisely at the 19th point upstream and the point 20 downstream which is the middle of the river. The value of K obtained from the calculation is 2164,383, while the value of X is 0.386. The average value of inflow in upstream is 5.36, while the outflow is 5.37. The average value for the downstream inflow is 4.606, while the value in outflow is 4.601. The flow hydrograph shows the differences in the initial value of the outflow input have no major effect on the resulting discharge and the value is almost equal to the end of the hydrograph. KeywordsFlood, Hydrograph, Discharge, Flow Search, Muskingum-Chunge

Flow Hydrograph Analysis in Watershed of Krueng Seunagan Nagan Raya District