Harvey highlights issues of aging 911 tech

As flood waters began swallowing roads and homes during Tropical Storm Harvey, panicked Houston residents did what everyone in the US is programed to do in an emergency. They dialed 911. But the emergency number struggled with record high call volume. At the peak of the storm, the service received around 80,000 calls in a 24-hour period. The Harris County area typically gets around 8,000 calls a day. Some people were unable to get through at all, and those who did were put on hold while a recording -- which promised the call was being processed -- looped. Desperate residents took to social media to post their addresses in the hopes that someone would get the information to the right authorities or a friend with boat. The requests went viral, leaving many wondering why 911 wasn't able to do more. Like most 911 systems in the U.S., Houston's is based on outdated telephone network technology.