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Transcript of Mathematics & Science Center
Virginia Watersheds
Mathematics & Science Center
What is a Watershed?
It’s the land that water flows across or under on it’s way to a
stream, river or lake.
A watershed with its small streams and larger river can be compared to a leaf with its sub-veins and main vein.
Watershed Movie
Courtesy of: Michigan EnvironmentalEducation Curriculum
We all live in a Watershed
• In the mountains or where the land is flat.• In cities, forests and on farms.• Even plants and animals live in a watershed.
Courtesy of DCR’s Soil & Water Conservation Programs
Watersheds Vary In Size
Hydrologic UnitsThe United States is divided and sub-divided into successively smaller hydrologic Units.
The Four Levels:• Region• Sub-Region• Account Unit• Cataloging Unit
What is a Divide?
A divide is the boundary that separates one watershed from another.
What is a Tributary?
A tributary is a stream or river that contributes its water to another stream, river or body of water.
Two Kinds of Water Pollution
• Point Source Pollution
• Nonpoint Source Pollution
Point Source Pollution
It’s usually easy to figure out where point source pollution comes from. If you see a pipe emptying into the water, that’s a point source. You can point to where it’s coming from.
Courtesy: The Scottish Agricultural College
Nonpoint Source Pollution
Nonpoint source pollution comes from places you can’t easily identify:
Rain washes loose soil off construction sitesRain washes oil and litter off parking lotsExtra fertilizer on lawns wash into our waterAcid rain exhaust from cars
Courtesy:www.deq.gov
Why Do We Study Watersheds?• Every place in Virginia belongs to a watershed. • The quality of water in each stream and river
depends in large part on the land use in the watershed.
• Land used for residential, agricultural, or commercial areas can either hurt or support water quality.
• Knowing where your water comes from is important, especially if any problems occur upstream.