Unit 2Lesson 2

PowerPoint 1

H20 Systems: NC Watersheds and Pollution

NC as an AqueductImagine NC as an aqueduct.

From which direction would the source of your water come from?

How does the geography of NC affect the flow of water through our state?

Where does all the water in NC try to drain out into?

What carries the water there?

WatershedsNC has 17 watersheds. Watersheds are geographic boundaries that

confine runoff to a particular region.The largest NC watershed is the Cape Fear

watershed. It is drained by the Cape Fear River.

Watersheds cont…Watersheds are separated by divides.

When precipitation hits the ground it is known as runoff. The topography of the land influences the direction in which runoff will travel.

The In-Depth Water CycleEvaporation•Water evaporates from the ocean or other body of water.

Condensation•Water condenses to form clouds.

Precipitation•Clouds release water in the form of precipitation.

Runoff•Precipitation hits the ground and begins flowing across the land.

Watershed•Upon hitting the ground, runoff is confined to a particular watershed.

Tributaries• Runoff begins to form

streams or tributaries. These water systems make their way towards larger systems.

Rivers• Tributaries form rivers.

Rivers drain watersheds of their contents. They flow towards drainage basins.

Drainage basins• Where rivers dump their

contents. The largest are ocean basins. Lakes are example of smaller drainage basins.

Water System MetaphorRunoff

• All the college football players going to play in the NFL.

Watershed• NFC• AFC

Tributaries

• Cowboys• Eagles• Broncos• Packers

River •Regular season games.

Ocean •The victor of playoffs goes onto the biggest stage in the NFL…the Superbowl.

The Mighty Cape FearThe Cape Fear River is NC’s largest river basin. It drains 27 counties, including Duplin.Empties into the Atlantic Ocean at Wilmington, NC.About 35% of the streams in the Cape Fear River Basin

are considered threatened and 18% are impaired by pollution.

Sediment is the major pollutant, but other types of pollution which pose significant threats to water quality include nutrients, oxygen-demanding wastes, and toxic substances. The pollution comes from different sources: urban stormwater, construction, agriculture, and wastewater treatment plants.

Source: http://www.water.ncsu.edu/capefear.html

Point Source vs. Non-point Source PollutantsPollutants are the substances that cause

pollution.The Cape Fear River Basin is affected by

many types of pollutants. These pollutants come from several different sources.Point source pollution – the source of

pollution is directly identifiable.Nonpoint source pollution – the source of

pollution is not directly identifiable.

Point or Nonpoint?

Point or Nonpoint?

Point or Nonpoint?

Point or Nonpoint?

Cape Fear Meets the OceanThe Cape Fear ends in New Hanover

County. It empties into the Atlantic ocean at the historic port of Wilmington. The area where a river meets the ocean is known as an estuary.

Estuary – unique ecosystemBreeding ground for certain breeds.Dilution of salt creates a unique habitat.

ConclusionA large amount of NC’s population relies

heavily on the Cape Fear River Basin (watershed) for potable water. It is important that we keep this basin free of pollutants and do our part to sustain the water needed for this area.

Tying it all together.How might pollution affect water

sustainability efforts in NC and what are some ways that we can help decrease the amount of pollutants entering our water systems?Write a “BLT” essay and submit it by the end

of class.