Hi Ian!
Portland has also been working on the “next steps” pointed out in this article. Street bioswales provide absorption and holding capacity. Downspout disconnection programs and new build codes drain rooftop rain locally on the property or out to the street instead of directly in to the sewers.
I think we have an easier time due to our lower density. Most lots have decent amount of exposed ground for rain infiltration, and the area has well draining soil. Tougher for cities more tight and built up. I think Seattle codified water management before the latest building boom so hopefully they will do alright too!