stormwater pond with five inlets

I am trying to model a catchment that includes a pond with five inlets and one outlet. Can anyone give me a hint how to do that, as my efforts to do it in transport and/or storage failed?

A. Spitzer
A.Spitzer@ABERTAY.AC.UK

Mr. Spitzer,

I have done this in extran, but there is a 5 conduit limit for any one junction. It appears your pond has 6 connecting conduits (5 in, 1 out). You will have to "merge" two of your inlet pipes into a dummy channel in order to have only 5 connecting conduits. Then use a storage node as the pond.

This has worked well for me. I simultaneously modeled 28 outfalls to a lake by grouping the outfalls into "branches" (dummy channels) of the lake.

Hope this helps.

Andrew B. Scott, P.E.
ascott@RKKENGINEERS.COM

A. Spitzer,

If you want to use the Storage module for simulating your pond, you will need to sum the locations (i.e. route all flows to a single location) in the upstream module before running the Storage module. For example, if the upstream module is Extran, simply connect all your downstream junctions together before routing to a single outfall (you will need to add 5 conduits and 1 junction to bring the flows to a single junction, and then add an additional conduit and junction downstream to route the flows to a single outfall for writing to the interface file). If the upstream module is Runoff, you can accomplish the same thing by simply adding 5 dummy pipes all with the same NGTO ID. If your 5 inflow locations are divided between two upstream interface files, then you can use a Combine module with the Combine option to sum all locations. Hopefully yours is one of these situations, if not then please describe your model in more detail.

Sincerely,

Rob James, P.Eng.
rob@COMPUTATIONALHYDRAULICS.COM