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Pipe & CB Storage

Pipe & CB Storage

Pipe & CB Storage

(OP)
Can't model storage from pipe and CB interconnecting two ponds.  I have a parking lot with two subcatchments.  A CB at the bottom of each basin.  First pond flows to second via a pipe (culvert).  Downstream CB has a vertical orifice restrictor plate at outlet invert.  When I add the pipe and CB's for storage volume I get major oscillations. What am I doing wrong?  

RE: Pipe & CB Storage

If the final restrictor is controlling all the storage, so that both CB structures form a level pool, then you could model them as a single "pond".  This will be easier to model (more stable) than attempting to model the equalizing effects between the two CB's.

Your "pond" can have a separate line in the storage table for each of the contributing volumes (above-grade, connecting pipe, CB, etc.)  In the outlet table, just list the restricting orifice.

RE: Pipe & CB Storage

What is a CB?

CAN A PRISMATOID CATCH BASIN HAVE TWO SEPARATE CULVERTS with different invert elevations,locations and sizes?

This would allow  controlling the outflow , both in magnitude and direction to different washes.

RE: Pipe & CB Storage

CB - Catch Basin

RE: Pipe & CB Storage

queque - Sure, you can have two outlets routed separately.  Set one to primary and the other to secondary.

RE: Pipe & CB Storage

I need two outlets. However , each outlet consists of a 18 in. culvert and a verticle orifice.
Which is primary and secondary?

i.e.  2 primaries and 2 secondaries?

RE: Pipe & CB Storage

(OP)
I'd say to make the one with the higher invert your secondary.  Each outlet (primary & secondary) will have two components, the orifice and the pipe.  Make sure the orifice are routed through the pipes they are in.

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