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# Creating Drop Structures in StormCAD

## Creating Drop Structures in StormCAD

(OP)
I'm having a problem with StomCAD V81 (SS 4) with creating a drop structure.

The calculated pipe slope is going from bottom of box > bottom of box, regardless of the inverts I input.

I have the boxes and conduits set to "false" for design.

Default Design Constraints are set to "allow drop structure, minimum drop depth of 0 ft"

Example:

Upstream INL-1 invert out = 202.50

Conduit L = 64 ft

Downstream INL-2 INV IN = 201.50
INV OUT = 196.63

When the calcs are run, the capacity of the 42" pipe joining the two inlets are based on a slope of 0.092 ft/ft instead of 0.0156 ft/ft

There must be a global setting somewhere that I am missing, as this is happening everywhere throughout this file.

### RE: Creating Drop Structures in StormCAD

#### Quote (Twink)

Example:

Upstream INL-1 invert out = 202.50

Conduit L = 64 ft

Downstream INL-2 INV IN = 201.50
INV OUT = 196.63

is your "out" invert really a foot higher than the "in"?

### RE: Creating Drop Structures in StormCAD

(OP)
It is the out of the upstream inlet, so pipe has a 0.0156 ft/ft slope.

To bring this thread full circle in case anyone searches this topic, this is how we solved this:

Close the file, have someone on another computer open and save it, reopen on the original computer.

Your guess is as good as mine, but it worked.

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