Modelling of storm water inlets

Hello,
I have a question concerning the setup of stormwater inlets in Mike Urban. Currently i'm working on the setup of a 1d-2d
model in Mike Flood, the area of interest contains about 2500 stormwater inlets. I had defined nodes at the positions of the
stormwater inlets with a ground level from the DEM and the invert level calculated from the ground level minus the typical depth
of the inlets chamber. Every stormwater inlet node is conneted to the nearest node of the pipe network.

I'm a bit confused about the parameters required in the curb inlets menu. Most or all will be on-Grade type.
In the manual is written that the invert level describes the point at which the spilling starts, does that mean that this is the
invert level of the pipe for the water transport from the inlet to the pipe network?

Is the freeboard defined as a water level on the street?

It seems that there are no informations in the reference manuals.

Thank you and regards

Johannes

Hello Johannes,
This is how a understand the curb inlet parameters:

[i]In the manual is written that the invert level describes the point at which the spilling starts, does that mean that this is the invert level of the pipe for the water transport from the inlet to the pipe network? [/i]
It is actually the invert level of your curb inlet, considering the way you define your nodes this is Ground Level – High of the Inlet (10cm i.e.). It works actually as weir crest.


[i]Is the freeboard defined as a water level on the street?[/i]

The freeboard is a parameter to ensure computation stability (avoid fluctuations). While running MIKE URBAN flood simulation two water levels are computed one in the MOUSE engine (MU) and the external MIKE FLOOD engine, then to estimate the discharge from one model into the other it is necessary to verify where the water level does is located either in the MU or in the MF surface. This is used to identify the direction of the flow 1D into 2D ( orifice equation) or 2D into 1D model (QQ relation or DQ relation).

The freeboard defines a critical water level (Invert level- Freeboard) at the connection node in the pipe network below which the defined DQ relation apply. For submerged and reverse flow (surcharge), the transfer capacity of the connection reverts to a standard orifice relationship.

Have fun modelling