Warm-up 10/12 1. As an environmental engineer, where would you recommend locating a drinking water well? Why? 2. Which soil sample had the greatest risk of transferring harmful chemicals into a drinking water aquifer? Why 3. What are some factors you would consider when locating your drinking water well?

How exactly DOES water “run-off?”

Remember our WATER CYCLE?

 volunteers?

Most precipitation falls where?

 Most precipitation falls in the ocean.

Most precipitation falls where?  Most precipitation falls in the ocean. Why?

Most precipitation falls where?  Most precipitation falls in the ocean. Why?  Nearly ¾ our planet is covered by oceans.

Does this precipitation remain freshwater?

 No, it is absorbed by the ocean & turns salty itself.

Does this precipitation remain freshwater?  No, it is absorbed by the ocean & turns salty itself.  Why does fresh water become salt water in the ocean?

Does this precipitation remain freshwater?  No, it is absorbed by the ocean & turns salty itself.  Why does fresh water become salt water in the ocean?  Water is the ____________ _________.

Does this precipitation remain freshwater?  No, it is absorbed by the ocean & turns salty itself.  Why does fresh water become salt water in the ocean?  Water is the UNIVERSAL SOLVENT….it loves to ___________ all sorts of stuff like salt.

Does this precipitation remain freshwater?  No, it is absorbed by the ocean & turns salty itself.  Why does fresh water become salt water in the ocean?  Water is the UNIVERSAL SOLVENT….it love to dissolve all sorts of stuff like salt.

Where does this water go?

A lot of it seeps into the ground through __________ rock,

A lot of it seeps into the ground through permeable rock,

…into aquifers we can access via _______ & springs.

…into aquifers we can access via (by) wells & springs.

But what about the rest of our rain that hits land & doesn’t go underground?  RUN-OFF!

Drainage/river basins allow water to flow down from highlands called DIVIDES

Drainage/river basins allow water to flow down from highlands called DIVIDES.

 There, gravity takes control & water moves towards a big river…

Drainage/river basins allow water to flow down from highlands called DIVIDES.  There, gravity takes control & water moves towards a big river out to sea.

Divides also separates watersheds from each other

Show map North Carolina has 17 river basins.

17 different paths that run-off DRAINS back into the ocean. North Carolina has 17 river basins.

And each river basin is made of smaller WATERSHEDS.

 Here’s one river/drainage basin:

And each river basin is made of smaller WATERSHEDS.  This is a smaller watershed.

And each river basin is made of smaller WATERSHEDS.  Here’s another small watershed.

And each river basin is made of smaller WATERSHEDS.  Another smaller watershed…

How many smaller watersheds are in this river/drainage basin?

 At least 9, maybe more?

How about us?  Whoa, that’s a lot of watersheds.

Bailey Middle is located right near a divide.