December 2016 January 2017
Figure 7 GWS in Bankura District as water Equivalent (monthly)
All the above results are relative to maximum value of 17.687852 cm and
minimum value of -24.306836 cm. It is observed that the month of
September 2011 has experienced maximum positive groundwater change with
a value of 17.6722 cm and June 2013 is observed with maximum negative
change of -24. 16828 cm. From the observation of above images, it is
found that the months of September, October and November showing
positive variations and April, May, June months are showing negative
variations of groundwater storage. Graph between time period and mean
GWS variations of Bankura district are displayed in figure 8.
[CHART]
Figure 8 Groundwater storing variations in Bankura district as
Equivalent thickness of water
From the graph, it is observed that the trend line of GWS variations in
Bankura district is decreasing at a rate of 0.0298 cm/ month (slope of
the trend line) during time period from November 2007 to January 2017.
It means groundwater depleting in the region at an average rate of
0.3576 cm/year. Reasons behind this groundwater depletion might be
agriculture. Because the district has Kangsbathi reservoir as major
surface water source which is distant from many places of the district.