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Calculation of Groundwater Gradient <br /> b-h <br /> 1 <br /> 'Where: <br />' x=distance from well with highest head, towards well with lowest head where the <br /> middle elevation head lies. <br />' hb=highest elevation head <br /> hm=middle elevation head <br />' hâ–º=lowest elevation head <br /> ch-,=-distance between well with the highest head and the well with the lowest head <br /> (87.17 -86.97. 64.6 <br /> X= 87.17'-86.93' <br /> x= 53.83' <br /> 1 <br /> A line is then drawn from the well with the middle elevation head through the point <br /> ' 'Y'. This is the strike line. A line drawn perpendicular from the strike line to the <br /> well with the lowest elevation head is the direction of groundwater flow. And slope <br /> can be determined by: <br /> _ hm-h, <br /> where: <br /> a <br /> m--slope of groundwater surface <br /> hm=rniddle elevation-head <br /> h=lowest elevation head <br /> ' c -) erendicular distance from strike line to well with lowest elevation head. <br /> r' <br /> 86.97'-86.93' <br /> m= 10' <br /> ' m= 0.004 ft/ft <br />