Filipinos enjoy water during World Water Day at the defunct water reservoir facility Wawa Dam, Rizal province, east of Manila, Philippines, 22 March 2015. World Water Day is celebrated around the globe on 22 March as a means of focusing attention on the importance of freshwater and advocating for the sustainable management of freshwater resources. (Photo by Ritchie B. Tongo/EPA)

Filipino children enjoy water during World Water Day at the defunct water reservoir facility Wawa Dam, Rizal province, east of Manila, Philippines, 22 March 2015. (Photo by Ritchie B. Tongo/EPA)

A washerman cleans clothes with polluted water in the river Buriganga in Dhaka, Bangladesh 22 March 2015. A large swathe of the Buriganga River which is the lifeline of the capital has turned pitch-black with toxic waste, oil and chemicals flowing into it from industrial units. The water became extremely polluted and represents a health hazard for the riverbed communities. World Water Day is marked on 22 March every year for to celebrate water. The theme in 2015 for World Water Day is “Water and Sustainable Development”, under the leadership of UNESCO. (Photo by Abir Abdullah/EPA)

Washermen clean clothes with polluted water in the river Buriganga in Dhaka, Bangladesh 22 March 2015. (Photo by Abir Abdullah/EPA)

A girl takes a bath from a public water tank on the occasion of World Water Day in Bhopal, India, March 22, 2015. (Photo by Sanjeev Gupta/EPA)

Kashmiri people wash clothes and dishes at the banks of a river at village Khanpeth in Pattan, north of Srinagar, the summer capital of Indian Kashmir, 22 March 2015. (Photo by Farooq Khan/EPA)

A young boy scoops water from a hand-dug well in the dry riverbed near Matinyani, in the semi-arid Kitui County in southeastern Kenya, 22 March 2015, the World Water Day. Residents of Kitui County and other arid and semi-arid areas of the country have been hard-hit by extremely poor rainfall this year while the government said in previous month that some 1.6 million people countrywide are facing acute starvation due to the drought and will need relief food over the next six months. Residents of Matinyani say they haven't seen a drop of rain in nearly four months. Thousands of Kenyans in rural areas walk tens of kilometers just to fetch water to drink and to be used in their homes. According to an estimate by UNESCO (United Nations Educational, Scientific and Cultural Organization), 17 million people lack access to safe water in Kenya, where the drought is a perennial problem. (Photo by Dai Kurokawa/EPA)

A woman enjoys the water overflowing from a defunct but still watery reservoir called the Wawa dam in Montalban in Manila on March 22, 2015. The Philippines observes World Water day on March 22, a global event that focuses on finding access to clean and safe water. (Photo by Noel Celisnoel/AFP Photo)

A vegetable seller carries water from river Brahmaputra before spraying them on vegetables on World Water Day in Gauhati, India, Sunday, March 22, 2015. (Photo by Anupam Nath/AP Photo)

A Buddhist novice monk fetches water from a lake Sunday, March 22, 2015, in Dala Township, 15 kilometers (9 miles) south of Yangon, Myanmar. (Photo by Khin Maung Win/AP Photo)

A sofa is pictured in the Sao Bento beach at Guanabara Bay, which receives waters from polluted rivers in Rio de Janeiro March 20, 2015. (Photo by Sergio Moraes/Reuters)

A boy plays next to rubbish on Sao Bento beach at Guanabara Bay, which receives waters from polluted rivers in Rio de Janeiro March 20, 2015. (Photo by Sergio Moraes/Reuters)

Rubbish covers the banks of Cunha channel, which flows into Guanabara Bay, in Rio de Janeiro March 20, 2015. (Photo by Sergio Moraes/Reuters)

Rubbish covers the banks of Cunha channel, which flows into Guanabara Bay, in Rio de Janeiro March 20, 2015. (Photo by Sergio Moraes/Reuters)

A Bangladeshi man checks the movement of industrial effluents flowing into the River Shitalakhya on the eve of World Water Day in Kachpur, near Dhaka, Bangladesh, Saturday, March 21, 2015. The U.N. warns that the world could suffer a 40 percent shortfall in water by 2030 unless countries dramatically change their use of the resource. (Photo by A. M. Ahad/AP Photo)

Villagers collect water on a donkey cart from a communal tap in Rapotokwane village in Limpopo, March 21, 2015. (Photo by Siphiwe Sibeko/Reuters)

Villagers collect water from a communal tap in Rapotokwane village, Limpopo, March 21, 2015. (Photo by Siphiwe Sibeko/Reuters)

Villagers ride a donkey cart on their way to collect water from a communal tap in Rapotokwane village in Limpopo March 21, 2015. (Photo by Siphiwe Sibeko/Reuters)

A woman pushes her cart, as she collects potable water from a public well on the outskirts of Managua March 20, 2015. (Photo by Oswaldo Rivas/Reuters)

A woman pushes her cart, as she collects potable water from a public well on the outskirts of Managua March 20, 2015. (Photo by Oswaldo Rivas/Reuters)

A woman takes a shower in a stream due to a water shortage in Panama City March 20, 2015. (Photo by Carlos Jasso/Reuters)

A woman washes in a stream due to a water shortage in Panama City March 20, 2015. (Photo by Carlos Jasso/Reuters)

Children hold a container as water is distributed in the neighborhood of Residencial los Jardines in Panama City March 20, 2015. Residents say that there has been no running water to their homes since January 2015 and that they have relied on water tank trucks that distribute water to their neighbourhood. (Photo by Carlos Jasso/Reuters)

A man fills buckets with water from a water tank truck as water is distributed in the neighborhood of Residencila los Jardines in Panama City March 20, 2015. (Photo by Carlos Jasso/Reuters)

An Indian ragpicker collects recyclable material from a polluted area of the river Brahmaputra on World Water Day in Gauhati, India, Sunday, March 22, 2015. The U.N. warns that the world could suffer a 40 percent shortfall in water by 2030 unless countries dramatically change their use of the resource. (Photo by Anupam Nath/AP Photo)

Shikha Roy, an Indian woman who lives on the pavement baths her one and half year old child Twinkle using water from a leaking pipe as it flows through a drain beneath on World Water Day in Gauhati, India, Sunday, March 22, 2015. (Photo by Anupam Nath/AP Photo)

In this February 28, 2015 photo, a bottle and a wood slat floats with other trash in Guanabara Bay in Rio de Janeiro, Brazil. Rio state authorities say they're working to make good on a pledge made in Rio's Olympic bid to cut the bay's pollution by 80 percent. The bay will host Olympic sailing events in 2016. (Photo by Leo Correa/AP Photo)

A Sri Lankan woman washes clothes at the river Kelani on World Water Day in Colombo, Sri Lanka, Sunday, March 22, 2015. (Photo by Eranga Jayawardena/AP Photo)

A woman tries to fetch water from a lake Sunday, March 22, 2015, in Dala township, 15 kilometers (9 miles) south of Yangon, Myanmar. (Photo by Khin Maung Win/AP Photo)

An Indian woman walks back after collecting water from a leaking pipe in Hyderabad, India, Sunday, March 22, 2015. (Photo by Mahesh Kumar A./AP Photo)

Plastic cans filled with water are kept on the steps as an Indian woman carries buckets of washed clothes and drinking water up a hill on World Water Day in Gauhati, India, Sunday, March 22, 2015. (Photo by Anupam Nath/AP Photo)

A Bangladeshi homeless child sleeps on a garbage bag on the bank of polluted river Buriganga on World Water Day in Dhaka, Bangladesh, Sunday, March 22, 2015. (Photo by A. M. Ahad/AP Photo)

A man bathes in a pond close to Cite Soleil, in Port-au-Prince, March 21, 2015. (Photo by Andres Martinez Casares/Reuters)

People wash clothes in a pond close to Cite Soleil, in Port-au-Prince, March 21, 2015. (Photo by Andres Martinez Casares/Reuters)

A woman washes her clothes in a pond close to Cite Soleil, in Port-au-Prince, March 21, 2015. (Photo by Andres Martinez Casares/Reuters)

A resident fills drinking water in containers from a municipal water tanker at a slum in Kolkata March 22, 2015. (Photo by Rupak de Chowdhuri/Reuters)

Residents get their containers filled with drinking water from a municipal water tanker at a slum in Kolkata March 22, 2015. (Photo by Rupak de Chowdhuri/Reuters)

A woman fills drinking water in a container from a municipal water pipe as others wait for their turn on the outskirts of Srinagar March 22, 2015. (Photo by Danish Ismail/Reuters)

An aerial view shows illegally built slums on the border of the polluted water of Billings reservoir in Sao Paulo February 12, 2015. According to local media, the Billings dam supplies 1.6 million people in the Greater ABC region of Greater Sao Paulo and the state government wants to treat the water to be adequate for human consumption, adding to the complexity of securing safe water supply during the drought. Brazil is facing its worst drought in 80 years and its economy is already expected to post zero growth this year. Worse yet, since Brazil depends on hydroelectric dams for about three quarters of its electricity, power shortages are also possible due to the drought, federal officials have said. (Photo by Paulo Whitaker/Reuters)

People walk across a bridge surrounded by litter and waste at a canal connected to the river Nile in Cairo March 22, 2015. (Photo by Amr Abdallah Dalsh/Reuters)

A Cattle Egret searches for food near litter and waste at a canal which is connected to the river Nile in Cairo March 22, 2015. (Photo by Amr Abdallah Dalsh/Reuters)

A Kashmiri village woman walks carrying an empty water tank on her head on World Water Day in Urwan, south of Srinagar, Indian controlled Kashmir, Sunday, March 22, 2015. (Photo by Mukhtar Khan/AP Photo)

A man sells water using a tank on a cart in Dala outside Yangon, February 10, 2015. (Photo by Soe Zeya Tun/Reuters)

Containers used to collect water are seen at Pamplona Alta shanty town in San Juan de Miraflores district of Lima, Peru, March 10, 2015. (Photo by Mariana Bazo/Reuters)

Paolo Grana collects water from a container at the Pamplona Alta shanty town, in San Juan de Miraflores district of Lima, Peru, March 10, 2015. (Photo by Mariana Bazo/Reuters)

A drought-related cactus installation called “Desert of Cantareira” by Brazilian artist and activist Mundano is seen at Atibainha dam, part of the Cantareira reservoir, during a drought in Nazare Paulista, Sao Paulo, Brazil, December 2, 2014. (Photo by Nacho Doce/Reuters)