It doesn’t take a hurricane or tropical storm to flood out streets in New Jersey’s coastal towns. “Sunny day flooding,” associated with high tides rather than storms, has become common in the past two decades due to sea level rise caused by climate change. And it will get worse in the coming years.

How bad is the flooding, and where and when does it take place? That’s what the New Jersey Department of Environmental Protection and the Jacques Cousteau National Estuarine Research Reserve want to…