Alluvial fan

An alluvial fan is a fan-shaped deposit formed where a fast flowing stream flattens, slows, and spreads typically at the exit of a canyon onto a flatter plain. A convergence of neighboring alluvial fans into a single apron of deposits against a slope is called a bajada, or compound alluvial fan.
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Noun
1. a fan-shaped deposit where a fast flowing stream flattens out
(synonym) alluvial cone
(hypernym) geological phenomenon

A triangular deposit of sediment left by a stream that has lost velocity upon entering a broad, relatively flat valley.

CONOIDE DI DEIEZIONE. CONO DI DEIEZIONE

Eng: alluvial fan
Urdu: (طَبعی ارضِیات) پَنکھے کی شَکَل کا دَریائی مَٹّی کا ذَخیرَہ ۔