I've thought about this all morning. A quick answer to your question - I don't know.
When I walked and searched the larger Spring Valley culvert just a couple miles west of this one (close to 75/Central) last weekend, I specifically noted that the culvert water was flowing toward me when I was standing on the bridge looking south. The water was flowing
north. It surprised me at first because the terrain of the land suggested somehow that it should flow away from me. But then I saw my google map and remembered that this was a tributary (Floyd Branch) coming from White Rock Creek, which ultimately comes from White Rock Lake--and then it made sense. (I think, lol. More on that.)
The culvert where Sherin was found is a much smaller one further east on Spring Valley (at Bowser); it is also not directly sitting on a blue tributary line on the map. Though if you keep following the railroad easement south a mile or so, you do see the tributary north of Walnut St called Audelia Branch, that forks and eventually, again, connects to White Rock Lake. And I suppose this might flood and contribute to rising waters in the area during a hard rain?
So here's the question I've been puzzling over this morning...if the water flow was in a northerly direction in the larger Spring Valley culverts just a couple miles down the road (and it definitely was), does that mean during heavy rains *all* the tributaries and flood waters flow away from White Rock Lake in that northerly direction? Or, was it just the one I was searching that day? (I'm geographically challenged--I'd been thinking land elevation also came into play.) Or, does the run off at the smaller Bowser Rd culvert maybe flow south, towards the sewers at Centennial?
If all the waters in the area flow the same direction during rain storms, then her body theoretically would have been washed northward in that culvert pipe, though I still couldn't tell you for sure where that means she'd have ended up. That drainage area is so very broad on the map (300' wide at least), I think it would have taken several days worth of hard rain to build up enough







to even move her body from the south end of the culvert toward the north end, in other words.