Hi everyone,
I am currently having problems with calibrating/finding my RTK parameters and derive a unit hydrograph for my wet period simulations, so any help is more than appreciated!!
I have set up my DWF and flow patterns, and I have calibrated my model using my field flow measurements and the SRTC tool implemented within PCSWMM. I have followed all the steps to derive an RTK unit hydrograph and I have implemented it in my simulations. I have also tried to calibrate the RTK parameters for short, medium and long-term responses. Everything works nicely in my calibration for DWF and all the steps work well for the RTK unit hydrograph creation, however, when I use the SRTC tool I see no response in my hydrographs (comparing my simulated and observed hydrographs), implying that my RTK parameters have no effect on my hydrograph response. How should I understand that my sensibility analysis results in no response from changing my RTK values?
Please note that I am ignoring initial abstractions and that I am using typical values for TK. As for the R values, I can calculate this and are in the order of 1/10 - 3/10 for all the sites I consider.
Any piece of advice or explanation as to why my RTK parameters have no effect on my simulations is more than welcome. Thanks!
Regards,
Claudio
Replies
A simple question, is the raingage you are using for your RDII the same period as your simulaiton time?
Hi all,
Thank you very much for the reply Robert. Indeed my raingage and simulation dates share the same time period.
I would like to update you all on the subject as I found my problem (part of being novel to SWMM). I missed entering my tributary area for the unit hydrograph so there was no I/I flows coming to my system.
I look forward to keep exchanging my experience of using SWMM, thanks.