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5 <br />4 <br />~ 3 <br />O <br />V? <br />7 <br />W 2 <br />1 <br />0 <br />0 <br />0.2 <br />0.4 <br />0.6 <br />i <br />Y <br />0.8 <br />r <br />~~ <br />C <br />1 <br />7.2 <br />1.4 <br />Nov-02 Dec-02 Jen-03 <br />Date <br />Figure 15 -Sub-basin DA-22 post-rehabilitation measured flow and rainfall <br />Event Analysis <br />The event analysis for Sub-basin DA-22 includes three pre-rehabilitation monitoring events <br />and three post-rehabilitation. The ]ZDII volume versus rainfall trends estimates a 43% <br />reduction in RDII post-rehabilitation. However, peak flows in Figures 14 and 15 do not show <br />apparent reduction in response to rehabilitation. In fact, the largest post-rehabilitation peak <br />flow is significantly greater than the largest pre-rehabilitation. This could be due to <br />monitoring errors, spatial variation of rainfall intensity, or indicate poor rehabilitation <br />effectiveness. With only three events each for pre-rehabilitation and post-rehabilitation, the <br />reduction estimate is not reliable. More observations would be needed to refine the reduction <br />estimate. <br />27 <br />