05.07.2009

Accumulation of stream-deposited sediments, including sands, silts, clays or gravels.

A gently sloping mass of unconsolidated material (e.g., clay, silt, sand, or gravel) deposited where a stream leaves a narrow canyon and enters a plain or valley floor. Viewed from above, it has the shape of an open fan. An alluvial fan can be thought of as the land counterpart of a delta

The amount of oil or gas that a well is permitted by State authorities to produce during a given period