Watersheds. What’s a Watershed? It's the area of land that catches rain and snow and drains or seeps into a marsh, stream, river, lake, ocean or groundwater.

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Presentation transcript:

Watersheds

What’s a Watershed? It's the area of land that catches rain and snow and drains or seeps into a marsh, stream, river, lake, ocean or groundwater.

What’s a Watershed? (cont) Area of land where all of the water that is under it or drains off of it goes into the same place. John Wesley Powell, scientist geographer, put it best when he said that a watershed is: –"that area of land, a bounded hydrologic system, within which all living things are inextricably linked by their common water course and where, as humans settled, simple logic demanded that they become part of a community."

Shifting Watershed Definitions Watersheds are not fixed areas –Depending on scale smaller watersheds may be combined and considered one larger watershed.

Watershed boundaries No matter what the scale, watershed boundaries are based on topography. pghttp://govinfo.ucsd.edu/maps/border/new1.j pg

San Diego Watersheds

San Diego River Watershed san_diego_river.htmlhttp:// san_diego_river.html

Website for rock cycle sugar activity %20&%20Minerals/rock%20cycle.htmhttp:// %20&%20Minerals/rock%20cycle.htm

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