Harvey dumped so much rain along the coast that larger rivers rose higher than their normal watershed boundaries and began flowing into other watersheds that used to be part of the larger river meander system and oxbows.
This image shows the lower Colorado invading the middle San Bernard - causing the Wharton gage (Colorado river) to flatten its crest while the Boling gage (San Bernard) gained additional water increasing its crest.
The
National Weather Service (post
Hurricane Harvey) said that the water rose high enough to go above the natural
Colorado watershed and pour into the
San Bernard watershed, flooding the
West San Bernard and
Peach Creeks.
