> For the complete documentation index, see [llms.txt](https://water-strategy.gitbook.io/waterstrategy/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://water-strategy.gitbook.io/waterstrategy/zhong-guo-ren/jiao-cheng/creating-a-reservoir-system/adding-reservoir-details/background-on-evaporation-and-precipitation-on-reservoirs.md).

# 水库蒸发和降水的背景

## 量化蒸发和降水流量 <a href="#quantifying-evaporation-and-precipitation-flow" id="quantifying-evaporation-and-precipitation-flow"></a>

**蒸发损失** 并通过以下方式增加了存储空间 **沉淀** 是水库物质平衡的主要组成部分。蒸发速率和降水率通常都以长度/时间来测量。以公制单位表示，这通常是 **毫米/天**。

要获得 Pywr 所需的日体积流量，将这些流速乘以 **区域** 水库的。在 WaterStrategy 的指标模板中，该区域通常用以下方式表示 **Km2**。

**对于使用 flow in 的模板&#x20;**<mark style="color:purple;">**mm3/天**</mark>**，需要转换 0.001 才能获得&#x20;**<mark style="color:purple;">**mm3/天**</mark>**。**

*蒸发量（毫米/天）\* 面积 (km)\* 0.001 = mm3/天*

**对于以 ML/day 为单位的模板，无需进行任何转换即可获得 ML/day。**

*蒸发量（毫米/天）\* 面积 (km)\* 1 = 毫升/天*


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