in order to compare the results of runoff obtained from SCS-CN model, runoff data obtained from ground truth and survey is required. so how can i download or from where i can get the runoff data of Damodar basin .
Dear Nikihil: Be careful, if you are applying SCS-CN (HEC-HMS?) for single storms you need daily and/or hourly data. There are some global runoff data bases but their reliability for specific studies perhaps is not enough for your purposes. Perhaps you can download from the national o regional institutions flow data from the basin or neighbour basins. Also Hydro-power companies often can share you at least some data from events for calibration and validation processes.
Dear Nikhil: I suggest you to read the following article if you are going to apply results from regional models: González-Zeas D., Garrote L., Iglesias A. and Sordo-Ward A., 2012. Improving runoff estimates from regional climate models: A performance analysis in Spain. Hydrology and Earth System Sciences, 16, 1709-1723. DOI:10.5194/hess-16-1709-2012.