Applies To Product(s): Bentley StormCAD Version(s): 08.11.04.54 Environment: N\A Area: Modeling Subarea: N\A Original Author: Jesse Dringoli, Bentley Technical Support Group Problem How do you model a combined kerb drainage unit, such as a "Beany Block" in StormCAD? Solution The UK kerb inlet type available in StormCAD for United Kingdom is for inlet capacity calculations for an inlet which is a single opening in a kerb, which has a chamber below it (gully pot) that is connected to the main drainage pipe. As mentioned, this is not the same as a “Beany Block” type of inlet, where the conduit is within the kerb unit. If the capacity of the circular openings in the block exceed the capacity of the pipe running along its length, an approximation may be to model these as a series of conduits, with a catchbasin node at the points where the road gradient (slope) changes, collecting all the runoff that would approach the kerb openings depicted by that segment of pipe (one conduit might represent several holes/beany blocks). The size of the conduit would be based on the equivalent circular size that may be obtained from the manufacturer and catchbasins would be configured with a 100% capture inlet. In practice there probably wouldn’t be a node at the upstream end of a run of beany blocks, so this could be an issue in reports for example – you would show something that isn’t going to be built. There might be an inlet of some kind immediately upstream of the run of Beany Blocks, but it would not discharge into the Beany Blocks – it would discharge into its own drainage pipe, and the Beany Blocks would connect up with it further downstream. If you would prefer to try to model the capacity of the openings, you'd need to place a catchbasin at every node location, with a conduit between them to represent the pipe/channel that runs between them, along with the gutter that represents the road. If you feel that for a given a storm of sufficient intensity the capacity of the holes would become a limiting factor, you may need to consider using the Inflow-Capture curve Inlet Type. In this case you would likely need advice from the manufacturer to get the numbers, plus it would mean placing large number of catchbasin node elements.
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