It seems that C3D is geared toward larger stormwater collection systems, with the smallest structure being a 24x24 rectangular. For smaller, on features such as patio or landscape drains http://www.kristar.com/index.php/con...drain-p-series would you just use a null structure, or create a custom part in part builder? Can null structure be modeled as such an intake within SSA?
Also is there an online resource of custom structures such as above to be downloaded/shared for free?
Thank you