Drought is an extended period of time where the regions water supply surface or underground water is very low. A drought can last for days, to months, to years depending on how far they are below there average of precipitation, and how much demand there is for water at the particular time. Droughts can have a huge impact on the ecosystem and agriculture of the region that is effected. Although droughts can last for several years, even a short and intense drought can cause a significant amount of damage to the economy.