All articles starting with W
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Water softening
Water softening is treatment that reduces dissolved calcium and magnesium, the ions causing water hardness, commonly by cation exchange with sodium in homes or lime and lime-soda softening by municipalities.
Water speed record
Water speed record: fastest speed on water. Powered record 275.97 knots by Ken Warby, Spirit of Australia, 1978; sailing record 65.45 knots by Vestas Sailrocket 2, Paul Larsen, 2012, over 500 m.
Water splitting
Water splitting, also known as decomposing water, is the chemical separation of water into hydrogen and oxygen, first achieved by electricity in 1789 and today the basis of hydrogen production by electrolysis.
Water square
A water square (Dutch: waterplein) is an urban public square designed to hold stormwater during heavy rainfall while serving as public space, developed in Rotterdam.
Water Street Healthcare Partners
Water Street Healthcare Partners is a Chicago-based private equity firm founded in 2005 that invests exclusively in middle-market healthcare companies; in May 2026 it closed its sixth fund with $1.9 billion.
Water stress
Water stress: pressure of human freshwater withdrawals on renewable freshwater resources, measured by the Falkenmark index, SDG indicator 6.4.2 (25% withdrawal threshold), and WEI+; global level about 18%.
Water stress and hypersensitive response domain
WHy (Water Stress and Hypersensitive response) domain: a conserved protein domain in LEA proteins involved in plant abiotic stress tolerance, desiccation protection, and the hypersensitive response to pathogens.
Water supply
A water supply is the system of sources, treatment, storage, and distribution delivering drinking water to homes and businesses, with pipe networks also serving fire protection.
Water Supply and Sanitation Collaborative Council
The Water Supply and Sanitation Collaborative Council (WSSCC) was a Geneva-based UN-affiliated organization working for water supply and sanitation for all from 1990 to 2020.
Water supply and sanitation in Australia
Water supply and sanitation in Australia is the system serving about 25 million people, reshaped by the 1998 Sydney water crisis and the Millennium Drought of the 2000s.
Water supply and sanitation in Brazil
Water supply and sanitation in Brazil is a municipal responsibility under the 1988 Constitution; in 2022, 77 percent of residents had household water and 59 percent had sanitary sewage.
Water supply and sanitation in Europe
Water supply and sanitation in Europe is the provision of drinking water and wastewater treatment, with 97% of the EU population connected to public water supply.
Water supply and sanitation in India
Water supply and sanitation in India is the system delivering drinking water and toilet services, run nationally through the Jal Jeevan Mission and Swachh Bharat Mission since 2019 and 2014.
Water supply and sanitation in Israel
Water supply and sanitation in Israel, also called the water resources of Israel, rely on five desalination plants supplying over 80% of urban domestic water and reuse of 87% of wastewater.
Water supply and sanitation in Mexico
Water supply and sanitation in Mexico is the national system for drinking water, sewerage, and treatment, with 96% connections yet only 43% safely managed drinking water in 2024.
Water supply and sanitation in New Zealand
Water supply and sanitation in New Zealand is provided mainly by local councils and regulated by Taumata Arowai, and is being restructured after the 2016 Havelock North contamination outbreak.
Water supply and sanitation in Saudi Arabia
Water supply and sanitation in Saudi Arabia, also known as water in Saudi Arabia, relies heavily on seawater desalination in a country with no permanent rivers.
Water supply and sanitation in South Africa
Water supply and sanitation in South Africa is the system of laws and infrastructure providing drinking water and sanitation, expanding after 1994 yet now marked by declining municipal performance.
Water supply and sanitation in Sub-Saharan Africa
Water supply and sanitation in Sub-Saharan Africa covers drinking water and sanitation services across the region, where over 987 million people lacked safely managed sanitation in 2022.
Water supply and sanitation in the Pacific Islands
Water supply and sanitation in the Pacific Islands provides drinking water and sanitation across Melanesia, Micronesia, and Polynesia; in 2025, 5 million people lacked basic drinking water services.
Water supply and sanitation in the Philippines
Water supply and sanitation in the Philippines is a fragmented sector in which 48.5% of the population had safely managed drinking water in 2024, while sanitation lags behind.
Water supply and sanitation in the United States
Water supply and sanitation in the United States is provided by roughly 150,000 public water systems and 17,500 wastewater treatment plants, regulated jointly by federal and state governments.
Water supply and sanitation incidents
Water supply and sanitation incidents cover boil-water advisories, main breaks, contamination in pipe networks, and supply interruptions, with 80% of US advisories caused by main breaks and pressure loss.
Water supply and sanitation regulation
Water supply and sanitation regulation is the set of rules, institutions, and enforcement through which governments oversee drinking water and sewerage services, including tariffs and quality standards.
Water supply network
A water supply network, or water distribution system, is the interconnected pipes, pumps, valves, and storage that deliver treated drinking water to consumers under pressure.
Water table
The water table, or groundwater level, is the surface in an unconfined aquifer where groundwater pressure equals atmospheric pressure, marking the top of the saturated zone.
Water tank
A water tank is a container for storing water in public water systems, private wells, rainwater harvesting, agriculture, and fire protection, balancing demand, maintaining pressure, and holding emergency reserves.
Water taxi
A water taxi, or water bus, is a small passenger boat carrying people for hire across a harbor, river, or bay, on demand or on short fixed routes.
Water tower
A water tower is an elevated water storage tank whose height pressurizes the distribution system by gravity, supplying demand peaks, fire reserve, and emergencies without pumping.
Water transport and hydraulics of Equisetum
Water transport and hydraulics of Equisetum describes how horsetails, lacking vessels and secondary growth, move water through primary xylem and internal canals, with root pressure driving guttation and embolism refilling.