Thanks a lot for the feedback. I was also wondering what return period do you use to design the upstreams and downstreams reservoirs? We design some reservoirs for 3 years return period to reduce the overflow from the combine sewerage to the river, and 30 years return period to remove flooding events. Do you have any requirements regarding when you should empty the reservoirs? How often you need to maintenance them? What is the more effective solution: to install underground reservoir or to implement sustainable drainage system? And the last but not least question: how are the stormwater projects being funded?

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Thanks a lot for the feedback. I was also wondering what return period do you use to design the upstreams and downstreams reservoirs? We design some reservoirs for 3 years return period to reduce the overflow from the combine sewerage to the river, and 30 years return period to remove flooding events. Do you have any requirements regarding when you should empty the reservoirs? How often you need to maintenance them? What is the more effective solution: to install underground reservoir or to implement sustainable drainage system? And the last but not least question: how are the stormwater projects being funded?