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AG 1997 08 12
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AG 1997 08 12
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Last modified
3/25/2002 6:30:00 PM
Creation date
11/27/2017 11:54:14 AM
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Meeting Minutes
Doc Type
Agenda
Meeting Minutes - Date
8/12/1997
Board
Board of Commissioners
Meeting Type
Regular
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Memorandum <br />Page 3 <br />August 6, 1997 <br /> <br />Physical Actions <br /> <br />There are a number of infrastructure type physical actions available. Some would require extensive <br />cooperation, coordination with or even be the responsibilities of other levels of government. <br /> <br />Creek cleaning is a visible act that removes stumps, fallen trees and debris from stream areas. <br />The results of such an effort vary by how extensive an action is taken and whether areas up <br />and down stream along with areas adjacent to stream areas are kept clean. <br /> <br />Remember without natural cover, stream banks become exposed to erosion; and more <br />importantly, there is little to slow rising waters down. Accelerated stream flows create <br />greater erosion problems and pose severe safety issues. <br /> <br />Creation of specific basin areas for stream overflow, detention and retention of high waters. <br />This requires the development of an extensive system of reserved land areas for sto,m water <br />retention and detention. Design of a system of this nature would require detailed engineering <br />analysis and most importantly a standardized design criteria based upon some level of rain <br />accumulated over a specified period (i.e., 6 inches over 24 hours). It would need to be <br />understood that any system would fail if weather conditions exceeded design standards. <br /> <br />Renovation and modification of existing drainage structures and areas where a damming <br />impact is created during heavy rains. Most of the County's road drainage crossings were <br />constructed many years ago. The Department of Transportation is responsible for <br />maintenance and replacement of these facilities. <br /> <br />When undersized culverts or older bridges restrict water flow, the results usually create <br />ponding in upstream areas and erosion problems at the culvert or bridge area. Floating debris <br />carried by rising water blocks these structures. During the July 23-24 storm, several bridges <br />and roads were under water or washed out (see "Attachment B"). <br /> <br />Reconstruction of these facilities including raising roadway approaches and/or adding <br />additional overflow relief routes could help ease specific area flooding problems. <br /> <br />Each of these approaches requires extensive study, engineering analysis and funding solutions. <br /> <br />Summary <br /> <br />There are certainly additional approaches that could be pursued regarding this issue. However, the <br />impacts of each approach along with the cost-benefit analysis required to include how these efforts <br />are to be funded are not simple to resolve. Finally, regardless of the direction the Board of <br /> <br /> <br />
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