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Rainfall

The quantity of water that falls as rain only. Not synonymous with precipitation.

Rainfall excess

The volume of rainfall available for direct runoff. It is equal to the total rainfall minus interception, depression storage, and absorption.

Rainfall, excessive

Rainfall in which the rate of fall is greater than certain adopted limits, chosen with regard to the normal precipitation (excluding snow) of a given place or area. In the U.S. Weather Bureau, it is defined, for States along the southern Atlantic coast and the Gulf coast, as rainfall in which the depth of precipitation is 0.90 inch at the end of 30 minutes and 1.50 inches at the end of an hour, and for the rest of the country as rainfall in which the depth of precipitation at the end of each of the same periods is 0.50 and 0.80 inch, respectively.

Rangeland

Land on which the natural potential (climax) plant cover is principally native grasses, grasslike plants, and shrubs. It includes natural grasslands, savannahs, certain shrubs and grasslike lands, most deserts, tundra, alpine communities, coastal marshlands, and wet meadows. It also includes lands that are re-vegetated naturally or artificially and are managed like native vegetation. The United States has 399 million acres of non-federal rangeland, about 30% of all non-federal rural lands, according to the 1992 National Resources Inventory. The BLM manages approximately 167 million acres of federal rangelands, and the Forest Service manages approximately 95 million acres of federal rangelands.

Rational Expectations

Market participants intuitively anticipate systemic policy actions and their consequences for the economy; thus, on average, private market forecasts are accurate and planned policy is ineffectual.

RCRA (Resource Conservation and Recovery Act)

U.S. federal law originally enacted by Congress in 1976 to prevent the creation of toxic waste dumps by setting standards for the management of hazardous waste.

Re-regulating reservoirs

A reservoir for reducing diurnal fluctuations resulting from the operation of an upstream reservoir for power production.

Reach

1. The length of channel uniform with respect to discharge, depth, area, and slope. 2. The length of a channel for which a single gage affords a satisfactory measure of the stage and discharge. 3. The length of a river between two gaging stations. 4. More generally, any length of a river.

Real GNP

The GNP of any year measured in the prices of a base year. Real GNP is nominal GNP adjusted for inflation.

Real Rate of Interest

The dollar interest rate corrected for inflation; equal to the nominal rate minus the inflation rate.

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