Created By: Tyler Chalk, Clair Segelke, Sam Sroufe, and Caleb Baker. Stream Disposition Created By: Tyler Chalk, Clair Segelke, Sam Sroufe, and Caleb Baker.

Deltas and Alluvial Fans Delta-As a stream enters a large body of water, the speed of the water decreases.This causes the water to drop the sediment that the water is carrying. This sediment piles up at the base of the stream to form a triangle shaped land mass. Alluvial Fan-When a steam descends a steep slope and reaches a flat plane, the water drops the sediment to form a fan-shaped deposit that forms on land with a tip that points upstream.

Floodplains Floodplain Natural Levees The Finer Flood Sediments The part of the valley floor that may be covered by water in a flood. Natural Levees Once the water overflows the banks of the river the water slows down and cannot carry as much sediment. That is where the natural levees are made, from the sediment that the water can no longer carry. The Finer Flood Sediments The finer sediments from the flood create very rich soil where the water flood. This was taken advantage of by many civilizations, such as the ancient Egyptians who depended on the yearly floods to replenish the farm ground.

Human Impacts on Flooding Vegetation naturally controls flooding, when humans do somthing to disturb this vegetation we can increase flooding by increasing the volume and speed of the runoff. Some of the ways that we impact flooding include: Fires Logging

Flood Control Building Dams The stored water from the dams can be used to supply fresh water and irrigated water for farmland A direct method of flood control is the building of artificial levees The levees need to be protected by erosion Floodways carry the excess water from the river away, keeping the river from overflowing.

Life Cycle of lakes Precipitation collects in a depression and forms a lake. Lakes live for a short period of time so a lake loses it’s water from excess draining or sediment build up. As water gradually drains out of a lake, it dries up forming a water basin.

Questions What ancient civilization depended on floodplains to replenish their farm ground? How is a delta formed? What are 3 ways to control flooding?