The most appropriate geographical unit for water resources planning is usually the river drainage basin.

对水资源的规划而言,最妥协的地理单位通常是河流的排水盆地.

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Among the latter are climate, relief the drainage basin , sediment yield, and the water discharge regime.

后者包括气候 、 流域的立体结构 、 产沙量和水排放的体制.

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