Fair point, I've bounced around on what colors to use. My rational for red for high water was not to indicate "deep" water per say but to show that the water is "up" in the higher elevation habitat. I reserved blue for deeper water slough. That way the historical calendars match the coding used in the hydrographs. They are color coded coordinated together, if that makes sense.
The data break in 1993 is a real eye grabber for sure.