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16 Cards in this Set
- Front
- Back
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Generally, What are the primary causes of flooding? |
Natural and mad made causes |
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What are some natural causes of flooding? |
Tsunamis Hurricanes Storm surges High tides Lots of rain in short time |
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What are some man made causes of flooding? |
Collapse of dams Increase run off from development |
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What is a Special flood Hazard area? |
An area that has potential for flooding with a 1% chance of occurrence every year. |
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Where are volcanic hazards likely to occur? |
Convergent boundaries Intraplate hotspots |
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What are common Volcanic hazards? |
Direct blasts - most destructive Mud flows Pyroclastic flows Lava flows Flood/tsunamis Tephra deposits |
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What are the natural causes of subsidence? |
Sinkholes Collapse of evaporate beds Collapse of lava tubes Hydro compaction |
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What are some common mad made causes of subsidence? |
Fluid withdrawal (water pumping/oil extraction) Mining |
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What is hydrocompaction? |
Re-wetting of fined grained alluvium Causes instability and subsidence |
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What are expansive soils? |
Soils that Shrink/swell as moisture content changes |
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What are expansive soils? |
Soils that Shrink/swell as moisture content changes |
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What hazards to expansive soils create |
They stress building foundations Can be damaging to structures |
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What are the sources of expansive soils? |
Expansive clay minerals Calcium sulfides Iron sulfides |
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What’s are common sources for expansive clay minerals? |
Weathering of volcanic rocks Weathering of sediments containing clays |
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What clays are typically the cause for expansive soils? |
Montmorillonite Smectite |
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What are common mitigation techniques for expanding soils? |
Avoid the swelling soils if possible Rove and back fill with non expansive soils Treat foundation |
