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Retained Earnings

Business profits which are held by firms and not paid to the stockholders of the firm; the earnings are usually reinvested by the firms.

Retarding reservoir

Ungated reservoir for temporary storage of flood water. Sometimes called detention reservoir.

Return flow

The quantity of water that is released from the point of use and which becomes available for reuse.

Revenues

Total gross earnings of a firm before subtracting costs.

Revised universal soil loss equation (RUSLE)

Revisions to the universal soil loss equation implemented in the mid 1990s to more accurately predict soil erosion caused by water. It includes the same factors as the earlier formula; climate, soils, topographic conditions, and the degree to which the use and management of the soil reduces erosion. But it takes advantage of new knowledge about these relationships and the capabilities of computer technology. The comparison between predicted erosion and T-value is important in making and carrying out conservation plans and achieving conservation compliance.

Rhyolite

Highly felsic igneous volcanic rock, typically light in color; rough volcanic equivalent of granite.

Ridge

An elongated area of high pressure in the atmosphere.

Riffle

A rapid in a stream.

Rift Zone

Elongate zones on continents that are in the form of a trough bounded by normal faults; the site of crustal extension, similar to that which occurs at mid-oceanic ridges.

Rill erosion

An erosion process in which numerous small channels, typically a few inches deep, are formed. It occurs mainly on recently cultivated soils or on recent cuts and fills.

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