alluvial flat

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Noun1.alluvial flat - a flat resulting from repeated deposits of alluvial material by running water
flat - a level tract of land; "the salt flats of Utah"
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Differences mainly occurred near streams where the landscape mapping showed larger areas of alluvial flat extending away from the creeks, whereas the UPNESS index was more confined to the streams in these locations.
Exploration also identified a potential resource within the alluvial flats of the Bamingui River of an additional 482,000 BCM of alluvial gravel, which at an estimated grade of 0.
Sample excavation has also started within the low-lying alluvial flats of the Bamingui River.