雪水當量(英語:snow water equivalant, SWE)指當積完全融化後,所得到的形成水層的垂直深度。積雪密度、雪水當量和雪深的關係是:雪水當量=積雪密度*積雪深度。雪水當量的估算對於融雪時可能的災害預防以及雪水資源的運用都十分重要。

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