Therefore, I have no pictures... My question was one of proactiveness...
Positive identification is the first order of business - and necessary before determining an appropriate management plan. Google photos of watershield/Brasenia and see if it resembles your unwanted plant. If you recall that your plant had a slimy coating on its submerged stems and underside of the leaves, it was undoubtedly watershield.
Finally, the picture of the lotus being sprayed by plane, where is that? Is that in Sugarland? There is a lake fairly close [East of Hwy 6] to Kempner Highschool that was over-taken by a floating vegetation for yrs that looked like the lotus plant. When I went by there 4 weeks ago, I actually saw alot of the water...slim chance of the same place, but you never know.
The lake to which you referred is in a park, operated by the City of Houston - and the floating plant was/is waterhyacinth. I visited that lake with staff from Houston Parks Dept awhile back to suggest treatment options, but I'm guessing funds were an issue.
