| Term | Definition |
| submergent | plants that have all their parts underwater |
| emergent | plants whose roots are underwater, but the top of the plant sticks out of the water |
| substrate | stream bottoms |
| riffle zone | area of turbulent water created by water flowing over rocks |
| riparian zone | area of land immediately adjacent to the stream bank |
| river channel | part of the stream in which the water flows |
| river system | a branching system from headwaters to river mouth |
| pool | area of slow moving water; catch basins within a stream of water |
| run | stretch of a stream that connects riffles with pools |
| subwatershed | the drainage area of a stream that flows into a larger river |
| watershed | land from which water drains into a given stream |
| 4 parts of a watershed | air, water, soil, living species |
| turtle | meaning of "Mackinaw" |
| major stresses of Walnut Creek | construction debris, channel incisions, runoff |