Water isn't the only thing in shortage in California. In San Francisco, at least, so is the parking space.
But since this is the world's main tech hub, there are, of course, apps for that. Valet start-ups such as Luxe and Zirx are offering everything from basic parking to car maintenance.
It is easy to spot a Luxe valet in San Francisco; look for the bright blue jackets. By pushing a button on a smartphone, the start-up's valets are notified of a driver's car in need of a pick-up. The driver notifies the valet when they want their vehicle returned, and can then head to their meeting, lunch or other activity.
Luxe charges a base hourly rate of $5, or $15 for the day. They have insurance and regular hours of business, and currently service San Francisco, Los Angeles, Chicago and Seattle with plans for Boston in coming weeks. They see themselves primarily as a consumer-facing company, despite having companies as clients and monthly parking plans.