Having moved to Palo Alto from a much, much rainier state (Maryland), the biggest thing I've noticed is the high number of rain puddles that linger in streets for days after a rain storm. Since Palo Alto has an average summer rainfall of pretty much nil, it seems that the drainage system is a "it only breaks for a month or two, so it's fine".
Unfortunately, with the recent deluge of liquid pouring from the sky, it's all that more obvious that poor drainage can cause flooding on streets, leading to car accidents and nearby housing damage, let alone pedestrians getting soaked when a passing car drives through a nearby puddle.
What is the work to reward ratio of adding better drainage to city streets? It seems that the results of ignoring our poor city drainage are becoming more obvious.