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Table 4 Precipitation concentration indices (1986–2015)

From: Climate variability and trends in the Endorheic Lake Hayk basin: implications for Lake Hayk water level changes in the lake basin, Ethiopia

Index

Category

Frequency of occurrence

(number of years)

 < 10

Low concentration (uniform distribution of rainfall)

0

11–20

High concentration

22

 ≥ 21

Very high concentration

8

Mean PCI (1986–2015) = 18.30 (high concentration of rainfall)