Control the problem
Intense showers are often short and local,and they only cause full-flowing pipes in some places.  And for a short time.  The solution is therefore retaining the excess water in other places of the system during the relevant time interval.  That is - where there is room for it - utilizing those places for storage.

The solution functions in far most precipitation situations and it does not require any investments in larger pipes  or in basins, it only requires flow control with suitable flow controllers.

By effective flow control we mean a discharge which quickly reaches the maximum flow and stays at or below this value.

Many options
It may prove necessary to build a storage basin if there is insufficient storage before the controller.  This can be done by either expanding the pipe dimension over a short length or by building a basin.

The basin-solution ensures that damages will not happen after (downstream) the basin.

To avoid the risk of blockage and to minimise the need for service and maintenance, the controller should be without moving parts.  Furthermore, its passageway should be large to minimise its resistance in normal, daily runoff situations.

When a controller is mounted in a structure it is guaranteed that only that amount of water which the sewage system downstream of it is able to transport without flooding, will actually be transported further down.  The rest will be discharged into a lake or stream.