| A | B |
|---|
| surface water | Water above Earth's surface. |
| runoff | Water that flows across Earth's surface. |
| groundwater | The water found in the spaces between rock particles below Earth's surface. |
| water table | The upper boundary of groundwater. |
| channel | The path that a stream follows. |
| tributary | A smaller stream that feeds into a river or river system. |
| watershed | The area of land that is drained by a river system. |
| divide | An area of higher ground that separates watersheds. |
| gradient | The measure of the change in elevation over a certain distance. |
| river's flow | The amount of water that moves through the river channel in a given amount of time. |
| stream load | Materials carried by a stream. |
| aquifer | A body of rock or sediment that stores groundwater. |
| porosity | The percentage of the rock that is composed of pore space. |
| permeability | The measure of how easily water can flow through an aquifer. |
| recharge | The process by which surface water trickles down into the ground, reaches the water table and enters the aquifer. |
| discharge | The process by which by which groundwater becomes surface water. |
| recharge zone | Area where surface water enters the groundwate. |
| discharge zone | Area where groundwater becomes surface water. (ex. - well_ |
