Stormwater Flooding Relief

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I have a client that wants to develop a site located in a topographic low that has a large off-site drainage area currently discharging into low area. Runoff from off-site sources discharges via a stormwater system into the eastern portion of the site and flows through a ditch to an open headwall pipe and enters back into the stormwater system. The downstream system acts as a choke point and the stormwater backs up and sits at the site during really heavy rainfalls. My client wants to divert the water around the site but allows the stormwater to backup on the site in an attempt to control the overloaded flooding areas during heavy rainfall events. I have a storage node that I want to act as the flooding area with a defined stage-storage curve. The upstream pipe network is sized to allow the peak flow; however, when I run the analysis, the upstream junction boxes still show the max water elevation reaching the rim of the box even though the maximum water elevation of the storage node does not reach the top and has head space for the max water elevation in the junction boxes. Is there a way to allow divert all water backed up at the choke point into the storage node? Thanks.