pH Hydrograph
Dated: Åžubat 20th, 2008
A pH hydrograph shows how the pH of the stream has changed over time. The pH of the Tioga River at this location is generally below 7.0. This low pH is caused by acid mine drainage entering the river at several locations upstream. The sharp increase in pH on August 30 was caused by the large amount of precipitation/runoff (probably with pH of about 7.0) entering the stream. The increased pH level slowly fell over the next few days as runoff and bank storage produced by the rainstorm slowly left the drainage area.
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Tags: drainage area, pH Hydrograph, rainstorm, tioga river