Drainage_and_Flooding_Report-dated_10_03_2008

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Mr. Ron Bottoms, City Manager fC l 0 t Z a s s o c i a t e s October 1, 2008 Page 11 of 31 effectiveness that limited ground slopes may have on the effectiveness of such LID techniques. If the City were to consider allowing use of LID techniques, the City should consider defining specific types, criteria, and effectiveness measures that should be -• when LID • are proposed. The City currently • •a into •*• provided that it can be certified by a professional engineer or architect that such encroachment will not result in increase in base flood levels. It is recommended that such certification can • •- provided by a registered professional engineer who is also a certified ••r manager 3. Prioritization of Drainage and Local Flooding Problems (Task 4.2 of Scope of Work) As part of the CWDS for the City, Klotz Associates was tasked with ranking the recommended projects for implementation to address drainage and flooding problems, both in the short and long term. Short ter -in problems and conceptual ways to address them for some areas have been discussed in Report #2. This report, Report #3, focuses upon the longer term problems requiring more extensive effort, usually reflected in significant capital improvements, to • Because of their greater cost or time to implement, a prioritization of such longer terin problems is useful because it helps the more critical problems to be addressed more rapidly and promotes cost effective use of available capital improvement flinds. Consequently this section focuses upon procedures used to define priorities for capital improvement projects to address longer term, more extensive drainage and flooding problems in the City. I . I Drainage problems can have their root causes in a variety • sources, • combination • • Solutions to problems should •- keyed to the source • the problem, but for conceptual planning purposes, inferences about the sources of problems must commonly be used as initial surrogates for clarifying problem • When drainage problems arising during periods of extreme rainfidl are located in floodplain areas, it is likely that insufficient channel capacity is the • • a