Geology notes october 6 for exam 2

Geology notes october 6 for exam 2 - Geology River f loods...

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Geology River floods occur when the discharge of a stream or river exceeds the capacity of the channel to carry the water. Streams and rivers are a collection of tributaries that gather water from a watershed or drainage basin. -The streams in a watershed are optimized to carry normal amounts of flow In the times between rain events, the flow in streams is a result of the discharge of groundwater into the stream bed. This is called base flow. -During rain events water that doesn’t infiltrate into the ground enters streams as overland flow. Flood events are usually caused by extreme rainfall events. -Floods can also be caused by rapid snow melt or by dam failure. When it rains, there is a lag time between the rain event and the rise time of the stream. -The maximum discharge is related to the rainfall rate and the rainfall duration -A flood hydrograph shows stream discharge as a function of time. Stream discharge is estimated from the stream stage using a rating
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Geology notes october 6 for exam 2 - Geology River f loods...

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