RTCC: Oceanographers have just identified the US coastal regions likely to experience 30 days or more of nuisance flooding every year. And the answer is that most of the American coast will experience high waters that are 30-60 cms above local high tides, at least 30 times a year. Nuisance flooding means just that - somewhere between an inconvenience and modest damage. But climate change, and its attendant sea-level rise, will make them much more frequent, and possibly more damaging. William Sweet...