[Qgis-user] How to convert depth belw ground level to depth below mean sea level in QGIS

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Dear friends,

The data provided for depth of water table in my country by the CGWB is depth below ground level , but for drawing the water table contours in modflow software the depth of water below mean sea level is needed.
So how the depth below ground level can be converted to depth with reference to mean sea level in QGIS

Regards
Navneet
QGIS user 
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