Direction of Flow

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Direction of Flow
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Spot Elevations/Benchmarks
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Map Symbols P.697
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USGS Maps

• United States Geological Survey
• 7.5 minute Series
• Quadrangle
• Why isnt it square?
• 15 minutes series

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Gradient Average slope

• Change in elevation
• ---------------------------
• Map distance

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Elevation
20 ft
Distance
1mile
20 ft/mile
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Elevation
60 ft
Distance
1.75mi
34.3 ft/mile