Guys...this isn't specific to the Nomad, or SC, or most of the other brands out there. I work at a shop, and you can find water in most BB cavities. If the BB cavity is open to the other frame tubes, water is very likely to collect at the lowest part of the frame...the BB shell. I suspect many bikes allow the most water through their seattubes, but obviously not the only source location depending on frame design...and how one cleans their bike...and if the bike sits outside or sits on a vehicle rack during transit during a rain...and how much submarining a given rider does on their bike. I tend to think most water found in a BB shell doesn't usually come through the BB bearing and spindle interface. It probably comes through those other sources I mentioned. That being said, most BB bearing and crank designs are not waterproof.
For many with particularly wet environments, a BB valve or drain hole is a good idea. Regardless, it's hard to keep all water out of a BB on most bikes without some creative or heavy duty engineering. Basically, bikes and water don't mix no matter how much some like to play in it...or how clean they desire to keep their bikes.
