Hi antiviro,

I've reverted this [1] and many other changesets you've subsequently made to the Addicks Reservoir. You have broken the multipolygon relation by leaving several inner polygons outside the outer polygon.

The previously mapped boundary represented the extent of the floodplains of the Barker Reservoir as the City of Houston had it drawn. If you have more a more accurate data source than that, please specify it in your changeset. Aerial imagery alone has no elevation data and you can't deduce floodplain zones from it.

Let me know if you have any questions.

-Clay

[1] https://www.openstreetmap.org/changeset/136671914