任何基地都需要水源补给。
水源补给以冰雪融水和降雨混合为主，部分地区有地下水补给，形成了大量的沼泽草地和湖泊。
Water supply comes from the melting water of ice and snow as well as rainfall. Some places have groundwater in the form of swamp lawn and lakes.
历史时期，四川地区良好的森林覆盖、充足的水源补给以及湿热封闭的环境都为瘴气的产生提供了必要的条件；
In the historical period, the good forest covering, the sufficient water resource and the clouding and humid environment provided the essential condition for malaria's production in Sichuan area.
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