The Maryland Department of Natural Resource’s, Chesapeake & Coastal Service is leading an initiative in collaboration with local partners to document the effect and impact of extreme high tides or “sunny day flooding” on our state’s coastline; waterways, private property and public infrastructure.
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Tide statistics via NOAA’s excellent Tides and Currents website.
Nuisance Flooding is commonly known as high tide or sunny day flooding and is coastal flooding that occurs at high tide and interrupts day to day activities leading to a public inconvenience such as road closures, and overwhelmed storm drains. A combination of sea level rise and land subsidence is leading to more frequent tidal nuisance flood events in our coastal communities. Higher than normal tides typically occur during a new or full moon and when the moon is in a perigee or during specific seasons. We are most likely to experience nuisance flooding during the winter and spring. In 2018 Cambridge, Baltimore and Annapolis tied or broke the record for days recorded of high tide flooding. NOAA issues a seasonal high tide bulletin to report regionally when higher than normal high tides can be expected. Local conditions such as precipitation, wind direction, and other short-term meteorological events may lead to nuisance flood events.
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