AutoCAD Civil 3D

[#1]

I was wondering if it was possible to restore a rule set to an existing pipe. we created a pipe network with about 100 pipes in it with a min. depth set to 6 ft. the pipes all came in with varying slopes, which is what we intended. someone in our group went through and set all the pipe slopes to zero for some reason and we need to undo that. this was done on the same day the drawing was created, the changes were saved and the drawing was closed so we can't "undo" and there is no previous version to restore to. my question is, is there some way we can select the network and "restore" the origially intended rules, or are we stuck with either redrawing all the pipes or manually changing the slopes back. (both would be an extreme waste of time)  
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[#2]

Go to the Modify tab of the Ribbon. Select Pipe Network from the Design panel. Expand the Modify panel, select Apply Rules.

[#3]

i set up a quick surface alignment and 3 pipes work of profile to test the solution offered by tcorey.

while it does apply the rules I noticed that the pipe slopes did not come in exactly like they did when first created.

So it's a good solution and might be what the original poster wanted.

without finding that command in the menu's i noticed if i selected more than one pipe the option for apply rules would no longer come up on the context sensative menu by right clicking.  

Nice work tcorey, I learned a new command from the ribbon