2. Auniform sand aquifer 19m thick has five piezometers spaced lm apart in a straight line along the aquifer. Each piezometer is located within the middle of the aquifer and is only open at the bottom of the casing. . A L B i. '3 i | i Ground surface elevation {Inaslj HE. 1,75 l 1?4 l HE: [ HE. i Depth of piezometer{m] ' 29 . 24 : 1f} | 14 l 21 ! _Dep1tostalicwaterlevel[tn} 23 :120 . 8 l 10 l 15 i a] Calculate hydraulic head, pressure head, and elevation head at each piezometer. [4] h} Calculate the hydraulic gradient(s]|. [2] c} Draw a cross section diagram that shows for each piezometer location: ground elevation, hydraulic head, and elevation head. [2] d) Draw arrows on your diagram to show the direction of groundwater ow. [2] e] Briey discuss what factors could cause this pattern of groundwater ow. [2]