Hydrological (water) drought refers to the impact of low precipitation on a hydrological system (e.g. rivers).
- Ground water of the area is short which causes a soil surface with desiccation or no precipitation in general in this area and this is caused by a lack of water in this area
- Top layer of soil tends to dry out, which causes plants to be unable to grow, and the dry out gets deeper into the soil which lets the rivers in ground water to dry out as well
Hydrological (water) issues are caused by Meteorological (weather) aspects, but they are not as obvious (e.g. Ground water)