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Physical Geography

by: Desiree Notetaker

Physical Geography Geography 110

Desiree Notetaker
Cal State Fullerton
GPA 3.77

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About this Document

In class notes. Covers run off and water shed.
Physical Geography
Class Notes
runoff, watershed, Physical, geography, precipitation, stream, flow, baseflow, rills
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This 2 page Class Notes was uploaded by Desiree Notetaker on Monday April 18, 2016. The Class Notes belongs to Geography 110 at California State University - Fullerton taught by in Spring 2016. Since its upload, it has received 7 views.


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Date Created: 04/18/16
Runoff and Watershed  AFTER A PRECIPITATION EVENT 1. Accumulation: water that reaches the surface and compounds. This is typically seen in  snowfall. If accumulation is persistent and climate conditions are optimum, accumulation can lead to massive ice caps, over geological time.  2. Absorption: water penetrating the terrestrial surface to be stored as groundwater or used  by the biome 3. Runoff: movement of excessive water movement downhill, with greatest efficiency  (Water’s behavior will be determined by various factors including infiltration capacity,  slope, volume, biome characteristics, etc.)  Hydrogeology  Streamflow: groundwater that is discharged into a stream or river system. Movement of water  into a stream  Base flow: the groundwater that supports a stream during periods of low precipitation.  Ephemeral – river or stream that only fills after a precipitation event because the climate is arid Ex: Rio Grande River  Watershed zones: a large geographic area where water drains using a complex system of  channels that often combine and discharge into the sea.  Rills: a shallow channel cut into the soil by the erosive action of flowing water (measured in  centimeters). A rill is created when rainfall reaches a volume that cannot be absorbed by soil.  Very first sign of a runoff.  Gullies: a gully forms when rills combine to form a larger channel of water. They form when  excessive water runoff occurs and then driers after a precipitation event. Gullies shed into  streams Tributary streams: form from runoff of precipitation, thus becoming the starting point of a  formal and often stable drainage basin (aka, watershed zone)  Confluence: when two or more tributary streams join together to form a main stream  Streams join to form rivers, rivers join to form major drainage arteries that reach the sea Mississippi Watershed Zone ­ Combination of various drainage basins. (*know at least 3)  Largest Watershed River in the United States.  Oxbox lakes: form when the banks of a meandering river erode. Causes the river to adjust its  course, while leaving a portion disconnected from the river.  HUMANITY AND WATERSHED  Human water use is estimated to be high as 5bilion gallons per day.  California – water budget for personal use said to be based on one acre­foot of water per  household of four per year.  Agriculture is extensive in many states. In dry states, 80% of water budget is dedicated to  agriculture  Hypoxia results from agriculture 


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