TOTV Team
08-04-2016, 07:00 AM
On Monday, August 1, 2016 the Project Wide Advisory Committee (PWAC) held a meeting that included a presentation and review of a Slope Stability Analysis performed by Kimley-Horn and Associates, Inc. (KHA) for the Lake Sumter island embankment on Morse Boulevard. The goal and objective of the analysis was to hault and prevent further erosion along the perimeter of the embankment during average conditions, and offer engineered options that were aesthetically pleasing that require minimal maintenance. The analysis did not include the Morse Boulevard bridge over Lake Sumter, and there is no evidence of issues with the structure.
The review included work performed by a sub-contracted geo-technical engineering firm who conducted extensive soil borings to thoroughly evaluate the slope of the island based on previous sloughing that occurred. Their findings concluded that the existing slope exceeded the Florida Department of Transportation (FDOT) minimum factor of safety for permanent slopes.
In conjunction with the information received from the geo-technical engineer, KHA further evaluated water depth, wind speed/direction, and wave height to conclude that erosion was occurring as a result of repetitive wave action during average weather conditions. KHA Engineers in attendance at the meeting presented three options to the PWAC to mitigate further erosion on the island embankment:
1. Rock Revetment structure fill and plantings
a. Highest construction cost ($1.47 Mil.); permanent solution with lowest anticipated maintenance.
2. Living shoreline with a toe protection breakwater structure
a. High construction cost ($1 Mil.); ongoing maintenance required.
3. Placement of additional coarse sediment fill with native plantings
a. Lowest construction cost ($520,000); highest recurring maintenance and least likely to address erosion as compared to option 1 and
The PWAC had extensive discussions regarding the options and the desire for a long-term solution that required minimal ongoing maintenance. Based on the review and information provided, and audience input, the PWAC directed staff to work with KHA to develop information to proceed with a rock revetment, option 1. Additional information will be presented at a future meeting.
The full Slope Stability Analysis is available on www.DistrictGov.org (http://www.DistrictGov.org), or by clicking the following direct link: http://www.districtgov.org/PDFView/PDFMeeting.aspx?id=20160801pa0201
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The review included work performed by a sub-contracted geo-technical engineering firm who conducted extensive soil borings to thoroughly evaluate the slope of the island based on previous sloughing that occurred. Their findings concluded that the existing slope exceeded the Florida Department of Transportation (FDOT) minimum factor of safety for permanent slopes.
In conjunction with the information received from the geo-technical engineer, KHA further evaluated water depth, wind speed/direction, and wave height to conclude that erosion was occurring as a result of repetitive wave action during average weather conditions. KHA Engineers in attendance at the meeting presented three options to the PWAC to mitigate further erosion on the island embankment:
1. Rock Revetment structure fill and plantings
a. Highest construction cost ($1.47 Mil.); permanent solution with lowest anticipated maintenance.
2. Living shoreline with a toe protection breakwater structure
a. High construction cost ($1 Mil.); ongoing maintenance required.
3. Placement of additional coarse sediment fill with native plantings
a. Lowest construction cost ($520,000); highest recurring maintenance and least likely to address erosion as compared to option 1 and
The PWAC had extensive discussions regarding the options and the desire for a long-term solution that required minimal ongoing maintenance. Based on the review and information provided, and audience input, the PWAC directed staff to work with KHA to develop information to proceed with a rock revetment, option 1. Additional information will be presented at a future meeting.
The full Slope Stability Analysis is available on www.DistrictGov.org (http://www.DistrictGov.org), or by clicking the following direct link: http://www.districtgov.org/PDFView/PDFMeeting.aspx?id=20160801pa0201
More... (#)