| Term | Definition |
|---|
| porous | rock that has many interconnected pores or fractures |
| non-porous | rock that has few pores that are not well connected |
| permeable | rock that water flows easily through |
| non-permeable | rock that water does not flow through easily |
| pore | a hole or opening in rock |
| topography | the shape of the earth's surface |
| headwaters | the beginnings of a water source |
| confluence | the spot where the headwaters progressively join other water sources |
| mouth | the endpoint of the waterway that opens into a larger body of water |
| catchment | any natural or manmade structure designed to capture water |
| sub-watershed | a group of catchments or smaller watersheds |
| basin | a group of sub-watersheds |
| erosion | when dirt is picked up and washed away by flowing water |
| gray water | all of the wastewater that drains from washing machines, sinks, dishwashers, tubs or showers and can be reused for non-sanitary purposes |
| watershed | a body of land that flows downhill into a waterway |
| pollutants | chemical that can contaminate a water supply, erode the land surrounding the body of water and disrupt aquatic habitats. |
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