仁王般若經疏 3.140

3.140

大水下，第四水難。須水而無，不用處多有。霜雹等悉屬水難。雨赤水多刀兵，雨黑水為疾病，雨青水多飢餓，雨土石仙人羅剎瞋；江河逆流海水溢，有賊也。

From 'great waters' onward is the fourth [calamity], the calamity of water. Where water is needed there is none, yet where it is unneeded it is abundant. Frost, hail, and the like all belong to the calamity of water. When red water rains down, warfare is frequent; when black water rains down, it brings disease; when blue-green water rains down, famine is rampant; when earth and stone rain down, it is the wrath of immortals and rākṣasas; when rivers and streams flow backward and sea waters inundate, bandits appear.