Rainfall and runoff is a natural phenomenon related to which rain is one of the causes of water flow on the surface of the soil. In the process of the occurrence of rainfall into the flow there are many influential parameters such as high rainfall, soil characteristics and land cover. The chosen location is Kali Lamong watershed because the Lamong River watershed has untapped water potential and also the rainy season often floods. In the manufacture of rain-flow model the method used is SCS curve number with HEC-HMS assistive program. After the rainfallrunoff modeling results from the simulation will be compared with the observation discharge available on AWLR Boboh to find out the reliability of the model that has been made. Based on the results of the 2011 rainfall data modeling, the maximum discharge was 223,9 m3/s which occurred onMarch 25, 2011 while for the observed discharge the maximum discharge was 425,28 m3/s which occurred on March 27, 2011 so that the accuracy of the model with the NSE method was 0,5961 the results were quite good although the model calculation still indicates a value underestimates from observational data.
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