It had been discussed in the past, that the flood control district build a tunnel, directly into the ship channel, or, perhaps Galveston bay (which is where the ship channel would lead, anyway).
This tunnel would connect to the Addicks and Barker reservoirs, so what happen to buffalo Bayou, where the houses were flooded with released water from them, wouldn't happen again.
When first proposed, it made more sense, but now, too much development in the pathway of where the tunnel would be built.
A 3rd reservoir seems more feasible now.