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• Figure 10. Surface Water Hiearboaata <br />300 <br />250 <br />200 <br />.i <br />a 150 <br />E <br />100 <br />50 <br />0 <br />Dec-96 <br />• <br />Dec-96 Dec-97 Dec-98 <br />fTR-A -~TR-B tTR-C -0-TR-D <br />500 <br />450 <br />400 <br />350 <br />300 <br />~ 250 <br />E <br />200 Q.Q.Q.\\\ <br />150 ~ ~ ~ ~\ <br />10 0 F-`~~ <br />50 <br />0 <br />Dec-88 Dec-89 Dec-90 Dec-91 Dec-92 Dec-93 Dec-94 Dec-96 Dec-96 Dec-97 Dec-98 <br />tTR-A -QTR-B -~-TR-C -0-TR-D <br />• <br />16 <br />