Cape Town officials are tightening water restrictions amid claims the city could run out of water by April 21. After three years of intensive drought, officials say residents are bracing for "Day Zero," the day water could stop flowing.South Africa's second-largest city would be the first major city in the developed world to run out of water, if residents do not heed new stricter water measures. The region is experiencing its worst drought in a century, which experts say has been exacerbated by climate change and in Cape Town, rapid population growth.Starting Feb. 1, Cape Town will force residents to cut their water consumption to 13.2 gallons per day, down from 23 gallons. The city has already banned filling swimming pools and washing cars. Also in an October mandate, people were asked to take two-minute showers and limit use of appliances, such as dishwashers and washing machines, Pumza Fihlani, a BBC correspondent in Johannesburg, tells Here & Now's Robin Young."For people that are used to the luxury that Cape Town promises, this has come across as a rather drastic measure," she says. "People are reusing some of the water that they've used in other areas and finding other uses for it around the household. This means limiting the amount of water you drink, limiting the showers that you take."City officials are blaming residents for ignoring previous water restrictions. Mayor Patricia de Lille said last week that more than 60 percent of residents are using too much water and threatened them with fines."We can no longer ask people to stop wasting water. We must force them," the mayor told reporters. The mayor also announced the city moved "Day Zero" up a day because of the overuse of water.When Cape Town reaches "Day Zero," residents in the popular tourist city of 3.7 million will have to line up to collect 6.5 gallons of drinking water per person per day at some 200 distribution stations. Those restrictions adhere to the World Health Organization's guidelines for the minimum amount of water needed in emergencies.But other experts say city planners failed to anticipate that the city's six dams, which are sourced by rainfall, would run out of water as drought worsened and the population grew, Fihlani says. Dam levels have dropped to 15.2 percent capacity of usable water, down from 77 percent in Sept. 2015, according to The Los Angeles Times."Not enough dams have been built over the time that the population has grown and infrastructure has remained the same and that's why the city now finds itself in the position that it's in," she says.Despite warnings since 2004, local government officials are criticizing South Africa's national government for its slow response to the crisis. As The Los Angeles Times notes: