After much head scratching (and some sleep), I determined the problem
was the divider node acting as a normal junction under dynamic routing.
Switching to kinematic routing solved the problem, but produced other
problems elsewhere in the model. I switch from a divider node to a
combination of junction node and downstream weir link (transverse). This
seems to function properly. To develop the parameters for the transverse
weir, I fit values from a spreadsheet set up for different
slope/flow/length combinations. A longitudinal road slope of 0.003ft/ft,
uniform cross-slope of 0.02ft/ft, and nondepressed curb opening length
of 2.0ft, produced a weir coefficient (Cw) of 6.64 and weir length (L)
of 0.72ft for Q=Cw*L*(d^(5/3)). Holding Cw at 3.0 (typical suggested
value for this general shape) produced a weir length of 1.6ft. Other
weir types were tried (side flow, triangular, trapezoidal), but the
transverse produced the best fit - which was pretty good.

Thanks!

--
Thomas S Blue PE PLS
Principal
BLUE: Land, Water, Infrastructure
tsblue@... www.blwi.com



Thomas S Blue PE PLS wrote:

> I'm trying to model flow into and bypassing curb inlets/openings along
> a roadway using SWMM (Build 5.0.006a). I am using divider nodes and
> tabular data to split the flow between two links (into the inlet and
> down the street). The problem is that it doesn't matter which of the
> two downstream links I designate as the diverted link, the flow always
> transfers in the same manner to the two links. In other words,
> switching the "road" link with the "inlet" link produces the same
> results. The input file updates correctly per the GUI modified
> parameter changes. Any suggestions on this?
>
> Thanks very much in advance!
>
>--
>Thomas S Blue PE PLS
>Principal
>BLUE: Land, Water, Infrastructure
>tsblue@... www.blwi.com
>