Lucas Stephens last edited by
A great example of an online, interactive, water tool: Texas Water Development Board's Flood Decision Support Toolbox: https://webapps.usgs.gov/infrm/fdst/?region=tx
Kathleen Ligon gave a great walkthrough of it at last week's Western States Water Council Meeting. It shows the base flood elevation in various floodplains.
You can see current stages, but also potential inundation maps based on simulated stages, with the ability to overlay buildings.