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Hurricane Harvey made landfall as a Category 4 storm the night of Aug. 25 between Port Aransas and Port O’Connor, Texas. As it moved across Texas, the storm proceeded to dump catastrophic amounts of rain. Please see below our exhibits, which illustrate the magnitude of rainfall that fell over the most intense 24 hours of the storm and a 3-day period (Aug. 26 through Aug. 28).

The Probable Maximum Precipitation (PMP) is the theoretically greatest depth of precipitation for a given duration that is physically possible over a given storm area at a particular geographic...

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TagsHurricane,

When a major storm hits your community, it’s only natural to wonder how it compares to a standard design storm. Was that a 100-year event (1% annual exceedance probability) or a 5-year (20% AEP)? Was it a 5-year event by peak intensity but a 100-year event by total volume? Answering these questions typically requires manual analysis of data from rain gauges or ground-truthed radar.

Freese and Nichols’ resiliency design and stormwater engineers have developed an automated GIS tool to answer these questions for communities across Texas. See below for a set of automatically-generated...

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Tags100 year storm event, Storm Event,