Editorial: City must address Ala Wai flood risk

With the aging sewage system already weakened, the city must do more to keep contaminants from concentrating in the Ala Wai Canal and Honolulu’s groundwater, and to improve flood protections so that these contaminants don’t wash over Waikiki. Flood risks, exacerbated by climate change and sea level rise, are far higher than was previously assessed — and unless action is taken, flooding and contamination is expected to intensify.