In the United States, water rights are generally divided into three main categories: riparian rights, prior appropriation rights, and groundwater rights. Riparian rights are based on the ownership of land adjacent to a watercourse, prior appropriation rights are based on the principle of "first in time, first in right," and groundwater rights are based on the ownership of the land overlying an aquifer.

Water conservation is the practice of using water efficiently and reducing water usage. The primary goal of water conservation is to ensure that there is enough water available for all users, including humans, plants, and animals, while also protecting aquatic ecosystems.

Water pollution can come from a variety of sources, including industrial wastewater, agricultural runoff, municipal wastewater, and stormwater runoff. Industrial wastewater can contain toxic chemicals and heavy metals, agricultural runoff can contain fertilizers and pesticides, municipal wastewater can contain sewage and other contaminants, and stormwater runoff can contain pollutants such as oil and grease.

The Clean Water Act (CWA) is a federal law that regulates water pollution in the United States. The CWA was enacted in 1972 and has been amended several times since then. The CWA sets limits on the amount of pollutants that can be discharged into water bodies, and it also requires states to develop water quality standards.

Water management plays a critical role in sustainable development. It is essential to ensure that there is enough water available for all users, including humans, plants, and animals, while also protecting aquatic ecosystems and minimizing the impacts of water pollution.

Drip irrigation is a method of water conservation in agriculture that involves delivering water directly to the roots of plants through a network of pipes and emitters. Drip irrigation is more efficient than traditional methods of irrigation, such as sprinkler irrigation and flood irrigation, because it reduces water evaporation and runoff.

Water treatment plants are designed to remove contaminants from water, add chemicals to water to make it safe to drink, and adjust the pH of water to make it less corrosive.

Activated sludge process, trickling filter process, and membrane bioreactor process are all common types of water pollution control technologies. These technologies are used to remove contaminants from wastewater before it is discharged into the environment.

Water law plays a critical role in water management. It is used to allocate water rights among different users, protect water quality, and regulate water use.

Water use conflicts can occur between a variety of different users, including agricultural users, municipal users, industrial users, and environmental users. Conflicts can also occur between upstream users and downstream users.

Water conservation plans are designed to identify ways to reduce water usage, set water conservation goals, and track water conservation progress.

Stormwater management programs, erosion control programs, and pollution prevention plans are all common types of water pollution prevention programs. These programs are designed to reduce the amount of pollutants that enter water bodies.

Water pricing plays a critical role in water management. It can be used to encourage water conservation, generate revenue for water utilities, and allocate water resources among different users.

Agricultural irrigation, industrial cooling, and groundwater recharge are all common types of water reuse. Water reuse is the practice of using wastewater for beneficial purposes, such as irrigation, industrial cooling, and groundwater recharge.

Water quality monitoring programs are designed to collect data on water quality, identify water quality problems, and track water quality trends.