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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,

Runoff from a new development is often conveyed to a detention pond that temporarily stores water and reduces the increase in flows. Since detention is intended to prevent localized flooding, questions begin to arise when downstream residents complain of new flooding issues after construction. Does the detention design meet criteria? Was there an abnormally large storm event? Does the criteria need to be reevaluated?

Recently, the Town of Sunnyvale was confronted with several questions from residents when two recently constructed schools possibly created new downstream flooding...

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Tagsdetention regulations, 100 year storm event,