watersheds 6 th grade science ldc. watersheds: 1.what is a watershed?what is a watershed?...
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WATERSHEDSWATERSHEDS66thth Grade Science Grade Science
LDCLDC
Watersheds:Watersheds:
1. What is a watershed?2. Movement of Water Through
Watershed3. Human Impact
What is a watershed?What is a watershed?A watershed is an area of land from A watershed is an area of land from which all runoff drains, or which all runoff drains, or ''shedssheds'' to to the same river, lake, or other body of the same river, lake, or other body of water.water.
What is a watershed: Everyone What is a watershed: Everyone lives in a watershedlives in a watershed
Your own backyard is part of a watershed.
You don’t need to visit the Delaware You don’t need to visit the Delaware River to see a watershed. You’re River to see a watershed. You’re already in one!already in one!
The System of WatershedsThe System of Watersheds Each is part of a larger Each is part of a larger picture or mosaic.picture or mosaic.
Watersheds are like pieces of Watersheds are like pieces of a puzzle:a puzzle:
A Nested SystemA Nested SystemWatersheds are also like Russian Watersheds are also like Russian MatryoshkaMatryoshka or nesting dolls. Larger or nesting dolls. Larger watersheds contain smaller watersheds contain smaller watersheds, which contain even watersheds, which contain even smaller ones.smaller ones.
Watershed AddressesWatershed AddressesJust as our homes have street Just as our homes have street addresses, our neighborhood addresses, our neighborhood watersheds have environmental watersheds have environmental addresses.addresses.
PA’s WatershedsPA’s Watersheds
Malvern
Movement of Water through Movement of Water through WatershedWatershed
Evaporation
Ocean Storage Groundwater flow to oceans
Aquifers
Infiltration into the ground
SpringsStreams and rivers
Condensation Precipitation
Lakes
Snowmelt
All of our freshwater starts as precipitation, All of our freshwater starts as precipitation, which moves continually through the water which moves continually through the water cycle (also known as the hydrologic cycle)cycle (also known as the hydrologic cycle)
Human Impact: How do we use
water? 1. Drinking Water-Water must be
treated to ensure water quality
2. Water use in the home 3. Agriculture / Irrigation4. Business / Industry
Human Impact on Watersheds:Human Impact on Watersheds:Some Examples…Some Examples…
1. Dumping of garbage by cities/ waste dumped by factories
2. Sewage/Human Waste3. Run off in cities and from
farms4. Acid Rain – Smoke and exhaust
combining with precipitation5. Agricultural chemicals may
lead to more algae (eutrophication)
Human Impact: Sources of Human Impact: Sources of PollutionPollutionPrecipitation runoff from farms, lawns, and paved Precipitation runoff from farms, lawns, and paved
surfaces is the leading source of water pollution in surfaces is the leading source of water pollution in America today.America today.
Human Impact: What’s in the Human Impact: What’s in the water?water?
Main pollutants:•Fertilizers•Pesticides•Oil, grease, and toxic chemicals from urban areas•Sediment•Road Salt•Bacteria and Nitrogen•Air pollutants
Protecting Watersheds: Protecting Watersheds: What You Can Do EverydayWhat You Can Do EverydaySimple Ways to Protect Your Simple Ways to Protect Your
WatershedWatershed• Conserve waterConserve water• Don’t dump or litterDon’t dump or litter• Cleanup watershedCleanup watershed• Water and landscape wiselyWater and landscape wisely• Be aware of environmental lawsBe aware of environmental laws
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