Coefficient of variance analysis (CV)
A measurement of reliability of rainfall at
each station for the study periods was done
using CV analysis. The spatial pattern of CV of
rainfall of 6 months and 12 months are shown
in figure 6a and figure 6b respectively. CV of
rainfall 6 months is calculated from monthly
rainfall in rainy period from May to October
each year. The values of CV 6 months vary
from minimum 10.84% to maximum 44.26%.
High CV values were found in the Western and
the Southern part of the region. The values of CV 12 months vary from minimum 10.30% to maximum 68.58% and
these values are higher than the values of CV 6 months. High CV values indicate the great variability in rainfall.
The high values of CV 12 months were also found in the Western part of the region which indicates that the risk of
agricultural activity in these areas is severe, because of erratic rainf