The Harris county flood map shows Lakes on Eldridge, for example, as being outside the 100 year flood plain-- so if I was looking for information before buying a house in that neighborhood, I would've gotten as far as this and then felt reassured and stopped looking.
If you live near these reservoirs, you drive by them daily or at least weekly, and see them turn into giant lakes after a mild storm (which for us can mean dropping several cm/in in the course of an hour or even minutes), and are also aware that we get big storms from time to time.
Thinking you are not at risk of flooding anywhere in the area, or near these reservoirs especially, is basically living in denial.
A quick check on Google Maps shows that right next to LOE is a road named "Addicks Dam Rd." That's a red flag. Zooming out on the satellite view reveals what certainly looks like a reservoir structure. More red flags. Googling "Addicks Dam" leads you to the Addicks Reservoir Wikipedia page which doesn't sound reassuring (even when you consider the pre-Harvey version of that page).
Of course, hindsight is 20/20, but it doesn't seem like there was anything in the way of due diligence to avoid choosing this neighborhood. I certainly believe however that realtors and the local government said that everything was fine in pre-Harvey times, as both had something to lose with saying the opposite. That's why I never rely on those sources alone.
There's a lot of additional information to be gained from Google Maps and OSM, satellite views, walking in the environment, checking historic news, talking with residents, etc. before settling on a neighborhood.
Even if the map was realistic, the 100-year boundary is not the level beyond which the flood risk is too rare to care about. At that level, the expectation is that the house will be flooded at some point.
http://www.harriscountyfemt.org/