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Thanks Benson.

I have attached the parameter and geometry files of the RORB model along with the input files used.

For example, looking at the storage RB4(MW)/RBWL9(DPM), using the ensemble method, the critical storm is identified by a duration of 30 minutes and TP25, with Q100=9.668 m3/s.

Therefore, I use the same TP and critical duration and change the pipe size/slope in order to ensure that no spillway flow from the retention basin and obtained an outflow from the storage of 0.703 m3/s with no.2 x 900dia pipes and 0.56% slope. Is this the right process for the determination of the most efficient outfall?

Thanks again for your help!

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