As Waller Creek winds it way through the East end of downtown from Waterloo Park to Ladybird Lake, it forms a sunken urban river walk very similar to the well-developed tourist attraction in San Antonio. For years, developers have dreamed of transforming the river walk into a similar (though smaller scale) downtown destination with retail, restaurants, bars, and maybe even a gondola or two. The problem is flooding: if it were to rain again in Austin, the water would wipe it all away.And this is why the City is building a very ambitious tunnel wish will somehow catch . . .