This post is a continuation of the series targeted to surface water data in Pennsylvania. The trends in this app are much more informative compared to trends shown by coarse grouping the time periods in another shiny app. Here the trends are based on grouping at several granularities. This aggregation was done for different spatial groups based on different criteria as follows:

• Locations with greater than 500 observations.
• Different Major rock types like Igneous, Limestone, Metamorphic, Mud/Silt and Sandstone.
• Different Provinces like Appalachian Plateaus, Atlantic Coastal Plain, Central Lowlands, Piedmont and Ridge and Valley.