
Aquifers & Flow
How to Read a Groundwater Hydrograph
Read the well identifier, dates, vertical-axis label and data notes before interpreting the line.
Groundwater is hidden, but it is not mysterious once the layers and pathways are named. These guides translate hydrogeology into careful mental models without pretending that one diagram describes every site.

Read the well identifier, dates, vertical-axis label and data notes before interpreting the line.

An aquifer is a permeable layer of rock, sand, or gravel that stores and transmits enough groundwater to supply wells or springs.