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c---° _._ ~_. ._._ ----- <br />85 Chap. 7 <br />Chapter 7 <br />Line source <br />Canal leakage penetrating to the water table can raise a ground water <br />ridge from which ground water can flow both ways as shown in the figure below <br />Comm. Ground surfotce_ <br />•~ .f •r'• s! !i ..°b~ _: 'ice' ~ .r . <br />- + : ' ~ _ ~ Voids na~io ' : V ' ' <br />. .. ,; f ., s-,~ <br />Fig. ?'-1 Line source <br />if it is assumed that conditions are sufficiently uniform to cause a parallel <br />flow the basic differential equation to be satisfied for a first approximation <br />treatmen° is; <br />8 -h ah <br />a axe at <br /> <br />'this is to be solved subject to the boundary conditions <br />q= 2 f at x= 0 for t> 0 <br />h= 0 when t= 0 for x> 0 <br /> <br />:~ <br />