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LI <br />Fiqure 6. <br /> <br /> <br /> <br />IJ <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />i <br /> <br />Surface Water <br />Ha <br />2s <br />zo <br />is <br />a <br />E 10 <br />5 <br />0 <br />Jun-81 Jul-B2 Sep-83 Oct-84 Nov-85 Dec-86 Jan-88 Feb-89 Mar-90 May-91 <br />'••TR-A QTR-B '•'TR-C P TR-D <br />Surface Water <br />Mn <br />0.8 ^ <br />0.7 <br />0.6 <br />0.5 <br />~ 0.4 <br />E 0.3 <br />0.2 • <br />0.1 <br />Jun-81 Jul-82 Sep-83 Oct-84 Nov-85 Dec-86 Jan-88 Feb-B9 Mar-90 May-91 <br />'•-TR-A ~ TR-B '•'TR-C O TR~•~ <br /> <br />