There is no pre developed Q1storm or pre developed Q10 storm control. The window passes the post developed Q50 storm only. The post developed Q50 storm flows through the upper window. Notice how the emergency overflow is not turned down. In this example the emergency overflow is turned down to conform to the slope.
Aeration is always a good idea in ponds.
This is a good example of combining the staged outflow, the low flow channel, and the emergency overflow. When a low flow channel is not provided the result is erosion and ponding water. There is little maintenance involved when a low flow concrete channel is in place. In this design the pre developed Q1storm orifice was buried in a catch basin. This may cause a maintenance concern if clogging occurs.