I study a area which always occurs infiltration in dry-weather and exfiltration in wet-weather, for there is a stream nearby the sewer.
When the level of the stream is higher than that of the sewer, it happens the infiltration, otherwise the exfiltration happens.
So if there is a proper way to simulate the process of the infiltration and exfiltration ?
I can set a pipe between the junction and the stream, but how to describe a stream in SWMM ? and how to set the level of the stream?