MDI(Moisture deficit Index)

MDI is an important drought index that considers soil moisture as one of the input parameters.

Krishnan and Singh 1972,

            Annual Precipiation(P) - Potential Evapo-transpiration
MDI= -------------------------------------------------------------------
                               Potential Evapo-transpiration


MDI value                     Interpretation
<-80                               Extremely dry
-80 to -60                       Semi dry
-60 to -40                       Dry
-40 to -20                       Slightly dry
-20 to 0                          Slightly moist
   0 to 50                        Moist
 50 to 100                      Wet
>  100                             Extremely wet