1. AIM: What is a stream/river?
Do Now:
Answer the following questions in your notebooks.
Where does the water come from that fills streams and rivers?
Where do streams and rivers begin?

2. I. Source of Stream Water
begin at higher elevations
water comes from:
Rain fall
Glacial Melting
Underground (especially when it has not rained for a while)

3. II. Describing Streams Discharge: Velocity:
The amount of water moving in the stream/river.
Speed at which the water is moving (depends on gradient)
How would gradient affect the velocity of a steam?

4. start of the stream/river.
(Headwaters)
Stream/River System
start of the stream/river.
Tributaries
small streams
Stream/River
Bank
sides of the channel
bending and turning of a stream channel (wander).
path the water follows.
end of the stream/river

5. *LESS WATER = SLOWER VELOCITY *MORE WATER = FASTER VELOCITY
Source vs. Mouth
Channel =
Gradient =
Discharge =
*Velocity =
Channel =
Gradient =
Discharge =
*Velocity =
wide
narrow
gentle
steep
less
greater
less
greater
*LESS WATER = SLOWER VELOCITY
*MORE WATER = FASTER VELOCITY
Gentle Gradient

6. Meandering (wandering)
III. Movement of Water
depends greatly on stream velocity, gradient and discharge.
dominant agent of erosion and deposition on Earth.
Meandering (wandering)
Gentle Slope
What words would you use to describe this river?

7. Aim: How do streams/rivers change the landscape?
Do Now: In your note books, explain how the velocity of a stream/river affects it’s ability to erode and deposit?

8. The more velocity/discharge a river has, the more erosion occurs.
The outside bank of the stream channel has the greatest velocity and therefore more erosion.
I. Erosion

9. Streams/Rivers erode (transport) materials in three ways:
(can’t see material)
Bed Load- bouncing or rolling
(too large to suspend)
(floating in middle)

10. As sediments are eroded they become rounder and smaller in the stream.
What causes the rocks in the river to become more rounded and smaller?
ABRASION

11. Narrow V-shaped valley’s are created as streams/rivers erode away bedrock.

12. - Take a worksheet from the back top bin
- Take out your ESRT and turn to page 6
* Each section counts by the place value listed at the beginning.

13. II. DEPOSITION
- as stream/river velocity/discharge decreases, sediments can no longer be carried.
- The inside bank of the stream channel has the lowest velocity and therefore more deposition.

14. This causes the sediments to be sorted.
What causes a river to decrease velocity?
- What type of sediment will deposit first? Why?
velocity decreases when the river enters a large body of water (lake or ocean).
large, round and more dense sediment to deposit first and smaller sediment to be carried further into the body of water.
Lake
This causes the sediments to be sorted.

15. What size sediments do you think make up the deltas and alluvial fans?
Deltas and Alluvial fans are an accumulation of fine sediment at the mouth of a stream/river.
What size sediments do you think make up the deltas and alluvial fans?
Why?
Silt and Clay

16. Outer bank is greater velocity and erosion
Oxbow Lakes are created as rivers move across the land making their channels straight.
found on older rivers
Describe the velocity on the inside and outside of the bank. What occurs because of this change in velocity?
Outer bank is greater velocity and erosion
Inner bank is lower velocity and deposition

17. Oxbow lake animation

18. Meandering River Cross Section Diagram
greatest velocity on a straight channel occurs in the upper-middle portion of the river.
greatest velocity on a curved cahnnel occurs in the middle but closer to the outside bank. B

19. At which letters does erosion occur?
At which letters does deposition occur?
A and D
2) B and C A B C D

20. In your Review books;
Page # 1-11
11. 4