Pierce County Public Transit: Severe Flood Analysis
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The Process
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Pierce county base map, public transit routes, and flood hazard data were imported to the feature dataset.
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Public transit routes were clipped to the Pierce County base map layer.
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Public transit route segments were dissolved to create just one feature class per route and calculate the entire length of each route in miles.
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The 60 dissolved routes were intersected with the flood hazard areas to create a feature class of route segments that would be compromised by flooding.
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Hazard segments of each bus route were dissolved to determine the total length of each route in miles that would be compromised by flooding.
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The total length of the compromised segments was divided by the total length of each route to determine the percentage of each route that would be compromised by flooding.
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Routes affected by flooding were symbolized using a green to red gradient, with green routes being less affected and red routes being more affected by flooding.
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Drop shadows were created for the Pierce County base map and waterways to enhance map readability. Affected bus route numbers were included for reference.