I have to design a detention pond and route an existing offsite flow through the pond. My question is since this is an existing flow how does it affect my detention pond for my site. The city is requiring a calculation utilizing the modified rational method, however they consider the existing flow as part of the site flow. This basically means I have to size my pond to detain this existing flow. I am looking for something to help me support not sizing my pond to handle this exisiting flow.
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