Flood Assessment - Pierce County, Wa

Pierce Transit Routes (bus)

26 Jan2'20

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Objective:  Flood plane data is exploited to discover (%) of route(s) which are prone to hazardous conditions on road ways in times of prolonged precipitation.

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The following data was sourced from (1)

and compiled with Arc Map:

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Route data was clipped to place emphasis on Pierce County, WA.  Flood plane information combined from the previous sources presented a hierarchical stage with highlighted flood-ways and catchment basins.  These feature were considered in categorizing Flood Hazards along route and a final product addresses the analysis objective.

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It is observed that of the approximately 626 miles of routes that make up Pierce Transit, approximately 6 miles (.94%) exist on a known flood-way.  In total, approximately 80 miles of the route may have up to a 20% chance of flooding.

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