It does rain in the desert, although rarely. However, when it does rain, it is usually a flood which produces a lot of water. This water does not usually last very long, but that is one way how water gets to the desert. Another way to get water is from fauna (plants) mainly from cacti
Another way desert regions can get water is through snow melt from nearby mountain ranges. During the winter, the snowpack builds up and as the weather warms it begins to melt. This runoff can reach into desert regions near the base of mountains and seep into the desert soil, reaching underground aquifers. Many species of cacti have long taproots that can reach these underground reservoirs, thus keeping themselves hydrated even when there is no surface water to be found.
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