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Watershed Introduction

Watershed Introduction. What is a Watershed?. An area of land, from ridge top to ridge top, that collects, stores, and releases water to a common point, such as a river or a lake. Portland Area Watersheds. Clackamas Columbia Sandy Tualatin Willamette Lower Middle. Streams Rivers

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Watershed Introduction

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  1. Watershed Introduction

  2. What is a Watershed? • An area of land, from ridge top to ridge top, that collects, stores, and releases water to a common point, such as a river or a lake

  3. Portland Area Watersheds Clackamas Columbia Sandy Tualatin Willamette Lower Middle

  4. Streams Rivers Lakes Wetlands Hills Mountains Farms Cities Houses Humans Animals Plants What’s in a Watershed?

  5. Human Impacts on Watershed • Land Use • Pollution • Too much of a good thing • Point Sources • Non-Point Sources • Erosion • Natural • Human-accelerated

  6. Runoff from: Streets Parking lots Roofs Driveways Lawns Urban Runoff

  7. Erosion

  8. Watershed Functions • COLLECT • STORE • RELEASE

  9. Watershed – COLLECT • Geology • Mountains, valleys, etc • Vegetation • Interception • Manmade surfaces

  10. Watershed – STORE • Wetlands, Lakes, Reservoirs • Soil • Groundwater • Snow and Ice • Biology

  11. Watershed – RELEASE • Streams and Rivers • Groundwater • Evaporation • Human Engineering

  12. 4 Dimensions to streams/rivers • Longitudinal • Lateral • Vertical • Temporal/seasonal

  13. Watershed Sciences • “Geo” sciences • Hydrology • Chemistry • Biology • Ecology

  14. Geomorphology • Physical shape • Parent material • Soils

  15. Hydrology

  16. Chemistry • Most “water quality” parameters are chemical measurements • Nutrients • Temperature, pH, DO, etc

  17. Biology • Bacteria • Algae • Plants • Animals

  18. Ecology • Terrestrial • Riparian and Upland Vegetation • Animals • Aquatic • Habitat (pools, LWD, etc) • Vegetation • Animals

  19. How do we study a Watershed? If our sampling site is at the red dot on the stream, the water we are testing could have interacted with any of the watershed area upstream of that point.

  20. Clackamas Watershed < BACK

  21. Clark County Watersheds < BACK

  22. Sandy Watershed < BACK

  23. Tualatin Watershed < BACK

  24. Lower Willamette Watershed < BACK

  25. Middle Willamette Watershed < BACK

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