A drought is a period of below-average precipitation in a given region, resulting in prolonged shortages in its water supply, whether atmospheric, surface water or ground water. A drought can last for months or years,or may be declared after as few as 15 days. It can have a substantial impact on the ecosystem and agriculture of the affected region and harm to the local economy.Annual dry seasons in the tropics significantly increase the chances of a drought developi
ng and subsequent bush fires. Periods of heat can significantly worsen drought conditions by hastening evaporation of water vapour.
Dams - many dams and their associated reservoirs supply additional water in times of drought.
Rainwater harvesting - Collection and storage of rainwater from roofs or other suitable catchments.
Recycled water - Former wastewater (sewage) that has been treated and purified for reuse.
Transvasement - Building canals or redirecting rivers as massive attempts at irrigation in drought-prone areas.