| S.N. |
Parameter |
Formula |
| 1 |
Coefficient of variation (C.V.) |
100 *Standard Deviation
Average |
| 2 |
Inter-annual variability |
Difference between two consecutive years(Δ) |
| 3 |
Annual variability(AV) |
Annual climate data- long term mean climate data( μ) or(Climate
variability, t= Annual climate, t-Average climate) |
| 4 |
Rainfall index (δi) |
δi=(Pi-μ)/σ, (δ is rainfall index for year , Pi is annual rainfall for year
i and μ is mean rainfall and σ as standard deviation) |
| 4 |
Anomaly |
Main value of particular year-normal average base year climatological
data |
| 6 |
Productivity loss or gain |
Yield loss (%)=[(Annual yield loss or gain (t\ha)*100)]/ Average
catchment yield) |
| 7 |
Planted area loss |
Loss of planted area (%)= [Area loss*100]/planted area |
| 8 |
Catchment yield gap |
Yield gap (%)=[yield gap (t\ha)*100]/ Highest catchment yield in the
time series period |
