In the area you have selected (Whatcom) urban flood hazard is classified as medium based on modeled flood information currently available to this tool. This means that there is a chance of more than 20% that potentially damaging and life-threatening urban floods occur in the coming 10 years. Project planning decisions, project design, and construction methods must take into account the level of urban flood hazard. The following is a list of recommendations that could be followed in different phases of the project to help reduce the risk to your project. Please note that these recommendations are generic and not project-specific.
Climate change impacts: In western, central and eastern continental US, medium confidence in an increase in the number of extreme rainfall events. In northeast US, medium confidence in an increase in days of intense precipitation. In southeastern US, model projections are inconsistent in changes in rainfall. In Alaska, high confidence in an increase in days of intense precipitation and the number of extreme rainfall events. The present hazard level may increase in the future due to the effects of climate change. It would be prudent to design projects in this area to be robust to river flood hazard in the long-term.
For further information the following resources could be consulted: