| A | B |
|---|
| Topographic | study of Earth's surface shape and features or those of planets, moons, and asteroids. |
| Intermittent | off and on |
| Perennial | lasting for a long time |
| Porosity | measure of the void (i.e., "empty") spaces in a material, |
| Equilibrium | condition of a system in which competing influences are balanced. |
| Aeration | the process of exposing to air |
| Hydraulic gradient | the direction of groundwater flow due to changes in the depth of the water table |
| Saturation | The soil or rock located below the top of the groundwater table |
| Capillarity | Water that at some point rises higher than that portion of its surface, not in contact with the solid surface. This is due to adhesion, cohesion and surface tension where later touches a solid. |
| Karst features | Areas underlain by soluble bedrock (e.g., limestone, dolomite) that are generally characterized by surface and subsurface features (e.g., sinkholes, caves) formed by the dissolution of rock by ground and surface water. |
| sediment | matter that settles at the bottom of a liquid; material deposited by water, wind or glaciers; material broken down by weathering; mostly in deltas, point bars, allevial fans, braided rivers, lakes, levees and waterfalls; includes sandstone, limestone, shale, conglomerate, and gypsum |
| Sinuosity | curve, bend or turn; distance measured between two points along a stream directed by a straight line distance between two points |
| knickpoint | straight line, distance between two points |
| floodplain features | floodplain composed of alluvium (clay and silt deposits); features formed by stream erosion, sediment transport, and deposition |
| Groundwater | water exits in pore spaces and rock fractures beneath the earth's surface |
| zone of aeration | where the water from rain seeps into the soil |
| saturated zone | where all spaces and rock fractures are filled with water |
| porosity | percentage of the volume of a rock that is open space and determined how much water a rock can contain |
| water table | surface below which all rocks are saturated with groundwater |
| permeability | is the measure of the degree in which pore spaces are interconnected and the interconnections size |
| aquifer | large body of permeable material where the saturated zone has groundwater |
