Drainage_and_Flooding_Report-dated_10_03_2008

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Mr. Ron Bottoms, City Manager October 1, 2008 Page 15 of 31 k I o t z associates and 6 and 9 suggests, however, that the weighting factors, in the approximate range of values used, is not critical to identify priority areas for remedy of flooding problems. Therefore only the hot spot identification provided by the policy -based weighting factors is used for actual prioritization for remedy of flooding problems. Based upon the maximum intensity within a hot spot zone, each high priority subdivision is given a rank, with highest ranking given to the area with greatest flood problem intensity. For convenience in analysis, the area with the greatest flood problem intensity is given a ranking of 10. The rankings given in Table I indicate the relative need for remedy of flooding problems in various subdivisions. This ranking can be used to identify an order for critical improvements, but as discussed in the following section, does not necessarily identify the most beneficial way to make improvements. I 1 111111 1 1 a . II I # I Te rei i Tieea or rein TTX prT #-= c T F7 aT MTTTMg"?TM that the importance of remedy of a flooding problem will depend upon the number of people beneficially affected by the remedy. Problem areas discussei, above and listed in Table I are associated with different subdivisions or different local areas. Different subdivisions or local areas about a hot spot area have different numbers of people, but when the drainage problems in the subdivision area are remedied, all, in broad general terms, of the people in the area benefit to some degree, not just the people with whom drainage problem reports are associated. That is, the value of a remedy of a drainage or flooding problem depends upon not only the severity of the problem but also the number of people -who will benefit by remedy of the problem. Drainage benefits in a subdivision area affect not only the residences which are reported to have flooded but also nearby residences because 1) nearby residences with flooding ma�,A e re-scorted the floodin 2�, street and VL� flooding, would have likely accompanied reported residential structure flooding and reduction of street flooding would benefit everyone living in the approximate area where residential structural flooding occurred; 3) reduction of street flooding would aid emergency access, which would benefit all people in the area if emergency access were required; and 4) less frequent or elimination of residential flooding contributes to improved property values (and consequent ad valorem evaluations). To capture these two aspects (severity of flooding and the number of people benefiting) for prioritizing CIP projects, we can plot for each subdivision or area identi bdivis 0- #$1 m I tj_qm Itaym argm I wma rA a It.] 4 U-141 FA IJ ly-M a t*111444 II_,M pi