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Regulation

The artificial manipulation of the flow of a stream.

Relative Humidity

The amount of water vapor in the air, compared to the amount the air could hold if it was totally saturated. (Expressed as a percentage).

Remote sensing

The act of detecting objects when the sensor is not in direct contact; commonly refers to using aerial photographs to observe conditions on the Earth’s surface. In agriculture, this technology can be used to determine what plants are being grown and their condition.

Renewability or Renewable Yield

The natural average amount of water that enters the watershed (or aquifer) each year (Wood, 2001)

Renewable energy

Energy obtained from sources that are essentially inexhaustible, unlike, for example, the fossil fuels, of which there is a finite supply. Renewable sources of energy include wood, waste, geothermal, wind, photovoltaic, and solar thermal energy. See hydropower, photovoltaic.

Renewable resources

Natural resources, sometimes called flow resources, that replenish themselves within time limits that permit sustained use, in contrast to nonrenewable resources. Congress recognized the renewable nature of resources managed by the Forest Service and Bureau of Land Management (including timber, livestock forage, recreation, water, and wildlife and fish) by requiring both agencies to follow the principles of multiple use and sustained yield.

Rent Controls

Fixed limits on rents that can be charged to tenants by owners according to a legal restriction.

Reservoir

A pond, lake, or basin, either natural or artificial, for the storage, regulation, and control of water.

Reservoir Gross Yield

The rate of water withdrawal that can be sustained for a given time period and drought duration including all uses and losses. The gross yield is typically a term that is used in the computation process for determining safe or net yield (i.e. the computed yield before losses and other abstractions are accounted for). Reservoir Net Yield: See Reservoir Yield.

Reservoir Net Yield

See Reservoir Yield.

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