Abstract:
Assessment of spatio-temporal variation provides a principal source of
information regarding groundwater recharge, storage and discharge.
Spatio-temporal variation of groundwater level (GWL) in Raipur city has been
studied using statistical and graphical methods. Monthly trend of GWL has been
investigated using Mann–Kendall test and Sen’s slope estimator. The monthly
GWL data of thirty observation wells (dug well) of Raipur city for the period 2010–
2014 have been used for the study. The minimum and maximum GWL has been
found out to be 0.84 m below ground level (bgl) which is 267.98 m above mean sea
level (amsl) and 16.61 m bgl (271.53 m amsl). Contour map shows that average
GWL varies between 1.74 and 13.80 m bgl (i.e. 280.34 m to 287.12 amsl) during
pre-monsoon and 1.64 m to 6.75 m bgl (i.e. 279.92 m to 282.54 m amsl) during
post-monsoon. GWL is shallower in central part of the city, whereas deeper GWL
has been observed in western and northern part of the city. The groundwater
contour maps depict that the groundwater flow direction is towards north and west.
The results of trend analysis reveal that no significant trend is detected at 5%
significance level except few locations.
