| Term | Definition |
|---|
| watershed | the land area that supplies water to a river system |
| groundwater | underground water |
| surface water | water collecting on the ground or in a stream, river, lake or ocean |
| aquifer | underground layer of sand, gravel, clay where groundwater collects |
| permeable | materials (sand and gravel) that allow water to pass easily through |
| impermeable | materials through which water connot easily pass (clay or granite) |
| porosity | measure of pores (empty spaces) in a material |
| porous | a solid with interconnected pores |
| percolation | movement and filtering of water through porous materials |
| run-off | the part of rainfall that drains off into rivers, streams and lakes |
| accumulation | process of growing into a large amount |
| water table | the top of the saturated zone (drill through to pump water into well) |
| recharge zone | area where new water enters an aquifer from the surface |
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