We’ve had our monsoon rains here in Arizona. Along the freeways here in some places we have “retention” basins to hold the runoff from the freeways when it rains until it can dry up or be diverted. But someone in charge of the Severe Alert system must work for the Maricopa County Sheriff’s Department.
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There actually are both retention and detention ponds. See this link for an explanation of the difference. http://www.newton.dep.anl.gov/askasci/eng99/eng99219.htm
I had always wondered about this, so am glad your post made me finally look it up! Thanks for a fun and educational site, keep up the good work.