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Unformatted text preview: • flat areas adjacent to steam channels, underlain by horizontal sediment layers deposited by stream • during floods, water overflows the channel and floods the flood plain ← ←- flooding occurs when water level in stream channel is higher than the stream’s banks • bankfull flow highest discharge or water level that can occur without flooding • levee walls of channel (riverbank) ← ←- What causes flooding? • Precipitation that flows (runs off) quickly into channels • Runoff occurs when more rain supplied than can infiltrate into the ground o Sandy and gravel soils lots of infiltration o Can’t infiltrate: clay soils, bedrock, frozen ground, already saturated ground, pavement ← ←...
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This note was uploaded on 08/30/2010 for the course GEOL 105 taught by Professor Kohut during the Spring '08 term at University of Delaware.
- Spring '08