Tracking the Drought

 

The Palmer Drought Severity Index is just one indicator the District uses to aid in determining the need to move from one drought stage to another.

 

This index uses temperature and precipitation data to calculate water supply and demand, incorporating soil moisture, and is considered most effective for unirrigated cropland. It primarily reflects long-term drought and has been used extensively to initiate drought relief. It is more complex than the SPI (Standardized Precipitation Index) and the Drought Monitor.

 

Additionally, the District may choose to initiate drought stages corresponding with the major public water systems serving residents within the District boundaries declaration of drought stages, as well as, water level data gathered from monitor wells chosen by TGRGCD that represent groundwater level fluctuations and declines.