Dear Rajeev Katwal ,

If you have 13 (altogether) flood events for your model study you should choose few events for calibration and the remaining for validation. For example It would be like 8 for calibration and 5 for validation.

Do you need the equation for calculating Nash Sutclife?

Regards

Miyuru

Thank you Miyuru Bandara Gunathilake . I will try it. I have got equation. One thing I need to know that should I choose one flood event for each year or Two flood event in a year ? which would be best ?

you can choose them arbitrary. There is no restraint for that

Hi Rajeev, i want to add one point

"To select the event for calibration and validation, you should check the similarity of the flood events in both the periods . Similarity means, how similar the data is in calibration and validation period in terms of mean, standard deviation, coefficient of skewness coefficient of Kurtosis, minimum and maximum flow value etc. based on the statistics, you can select the events for calibration and validation period." 70% event you can consider for calibration and 30% for validation.

Miyuru Bandara Gunathilake

I am called Richard, a Ph.D. candidate in Physical geography. In fact, dear Dr., I came across your full profile on researchgate and quickly jumped on google scholar to look for your researches. However, I saw that you applied the HEC HMS model on event-based simulation and also saw your response given to the question regarding the model.

Dear Dr., I am new to this model and would like to apply it to simulate the flow discharge on my delineated catchment and its 5 sub-basins. I have daily rainfall data and few daily observed discharge data (for years 2011, 2012, and 2013 from only one station). Any advice on if or how these data can be used?

I had a problem with how to select the events for calibration and validation. I understand how to calibrate but I don't understand how validation is done? To my eyes in different papers, it seems like the way of calibration is the same way of validating (which I think is not true). How is validation done?

Moreover, I have 5 sub-basins. Does it mean that I have to have observed discharge data for 5 stations (for each sub-basin)? or I can use the only one station that I have?

Will I have to produce simulated flow for each sub-basin per event? or only simulated flow for the selected events? what if I want to calculate the simulated flow for the entire catchment?

Thank you very much for your helpful feedback

Dear Richard Mind'je

Please email your question to [email protected]

I will provide feedback and required advice.

Thanks and with regards

Miyuru

thank you very much Dr. I will do that.