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Watersheds ESI ESI
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A map of streams in an area
Can you determine the watershed for this stream?
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N Major stream in watershed Drainage divide high spot or ridge
B What is general streamflow direction? Any water flowing north? Cross-section
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B A Cross-section Drainage Divide Runoff to the west
Runoff to the east Looking north up ridge B A Cross-section
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Major streams in watershed
headwaters Watershed boundary headwaters Tributary to major stream mouth main channel mouth
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Stream Gradient Water flows downhill ! headwaters Drop in elevation
-Idiot’s Guide to Stream Hydrology Drop in elevation mouth Distance traveled Stream Gradient = Drop in elevation, feet Distance traveled, miles (average) Typical stream gradient in Prince George’s County – xxx ft/mi
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N Area of collection of precipitation
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Steps in the hydrologic cycle
precipitation runoff and stream – surface flow evaporation transpiration infiltration groundwater (subsurface) flow evapotranpiration
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runoff precipitation transpiration evaporation infiltration groundwater
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N Watershed subwatershed Even smaller subwatershed
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Nested watersheds airshed watershed Watershed is like a funnel
Container such as Chesapeake Bay
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Watershed and Airshed of Chesapeake Bay
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Maryland’s Watersheds
To the Delaware Bay watershed To the Mississippi River Watershed East coast continent divide 95% of Maryland drains water into the Chesapeake Bay To the Atlantic Ocean directly
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Prince George’s County
Potomac River Watershed Patuxent River Watershed Drainage Divide in Prince George’s County
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