Clicking on the search button (top-left) to select a station to focus on. 

Clicking on the layer option button (below the search button) to select a base map.

Click on the source selection button (below the layer option button) to select one or a few sources of the stations to display. Note: if USGS is selected, its data are not about water level, but about precipitation, wind direction, or wind speed. Therefore, you need further select which of the data (in, Deg, or mph) to display for the station. 

Click on the log in button (below the source selection button) is to log in the internal site. Note: only authorized users with accounts are allowed. 

Move mouse over on a marker to show detail of the station of your choice.

Click on a marker (sensor) to pull down Time selection, then click on a time to display a graph of the data of the selected sensor. 

Based on Windy Map. 

Data from GS, NOAA, ODU, StormSense, USGS, and VA.

Implemented with Python and JavaScripts. 

Select the time range of rainfall contour in the bottom dropdown list