Dual drainage system (Grassed swale with porous subsurface drainage)
i am a beginner in SWMM who taking master study currently. My study is about the modeling of a dual drainage system. This dual drainage is a combination of grassed swale and porous subsurface drainage which receives water from surface grassed swale infiltration, in parallel arrangement. The subsurface drainage (tank module) is in rectangular shape (http://www.enter-shop.com.au/catalogue/c2/c11/p263).
I have set up a simple network, however i am not sure what kind of method should i use in SWMM to distribute the amount of rainfall to surface grassed swale and subsurface drainage according to my observed data (water depth and velocity for surface and subsurface drainage).
May i have any suggestion about the method of SWMM modeling for this kind of dual drainage system?