地表径流汇集的地区。

Areas where surface runoff is directed.

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一旦这个池子形成，径流就会进一步汇集，从而形成一个湖泊。

Once this pan formed, further run-off collected, and formed a lake.

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降落在流域上的雨水经过产流机制的作用汇集到流域出口形成流域径流。

Rainfall in the valley through the rain runoff mechanism collects to a basin export, and forms a watershed runoff.

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