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Sub-Basin DA 21 <br />Pre- vs. Post-Rehabilitation Monitoring Results <br />2.5 <br />2.0 <br />~ 1.5 <br />m <br />E <br />O <br />_~ 1.0 <br />0.5 <br />0.0 <br />0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 <br />Event Rainfall Volume (in) <br />Figure 13 -Sub-basin DA-21 pre- vs. post-rehabilitation event comparison (measured flow <br />vs. event rainfall) <br />DA-22 Basin <br />Seasonal Tabulation <br />Sub-basin DA-22 measured flow data from October 1995 to January 1996 were selected for <br />the pre-rehabilitation seasonal time period and from November 2001 to April 2002 and <br />October 2002 to February 2003 for post-rehabilitation. <br />Dry weather flows were selected during the summer months. July 17-23, 1995 was chosen as <br />a representative sample for the pre-rehabilitation time period and June 10-16, 2002 for a <br />representative sample of the post-rehabilitation period. <br />Table 4 presents the results. of the seasonal effectiveness assessment for the DA-22 Sub-basin. <br />Results of the seasonal reduction analysis in the DA-22 Sub-basin are inconclusive. The pre- <br />rehabilitation period wet weather flow volume to rainfall ratio is approximately the average of <br />the two post-rehabilitation periods. Furthermore, the large difference in the ratio for the two <br />post-rehabilitation periods prevents any reliable conclusions. <br />Reduction = 26% <br />O <br />y = 0.31 x <br />4 <br />o y = 0.23x <br />0 <br />e <br />o Pre-Rehabilitation <br />® Post-Rehabilitation <br />