Story highlights Cape Town is in its worst drought in 100 years and the situation is likely to be a long-term problem

City residents have been asked to reduce water usage to 100 liters per day

(CNN) The worst drought in a century is forcing the most stringent water restrictions ever implemented for South Africa's second largest city.

Cape Town has less than 10% of its useable water remaining for its nearly 4 million residents.

The city is implementing Level 4 water restrictions , which ask residents to limit daily usage to 100 liters (26 gallons) per person. The measure is meant to reduce demand and conserve what little water is still available, and means significant sacrifices for residents.

For Cape Town resident Suzanne Buckley, the restrictions mean adapting to a new lifestyle.

"We have buckets in our shower and bathroom sink to save excess water," Buckley said. "The gray water is then used to flush our toilets."

Photos: Cape Town faces severe drought Dry sand bakes in the sun on April 16, 2017, at the Theewaterskloof Dam, a key source of water to Cape Town, South Africa. Hide Caption 1 of 7 Photos: Cape Town faces severe drought The Theewaterskloof Dam on May 10 held less than 20% of its water capacity. Hide Caption 2 of 7 Photos: Cape Town faces severe drought A boat lay on the sand on May 10 at the Theewaterskloof Dam. Hide Caption 3 of 7 Photos: Cape Town faces severe drought A truck crosses a bridge on May 10 at Theewaterskloof Dam. Bridge supports show previous high water marks. Hide Caption 4 of 7 Photos: Cape Town faces severe drought Bare sand and dried tree trunks stand on May 10 at the Theewaterskloof Dam. Hide Caption 5 of 7 Photos: Cape Town faces severe drought The Theewaterskloof Dam on May 8 experienced an extremely low water level. Hide Caption 6 of 7 Photos: Cape Town faces severe drought Sand and dry trees stand on April 16 at the Theewaterskloof Dam, where the water level has been extremely low. Hide Caption 7 of 7