28 OCT 2019 Structure Selection
Monday, November 28, 2016
09:58
Fred Seling
Jon Mihoci
Sheldon Schlabach
Herb Koger
Jessica Chouteau
Miles Hebert
Kenny Knapp
Adam Mellen
Mike Weiler
Bob Bianchi
Table was presented showing hydraulic information for four alternatives
100 year event - 3-5 feet per second velocity
Alternative 1 - 38' single span slab is the longest available for singe spans in the standard drawings
Alternative 1A - Three span - Piers are now INSIDE the touchdown point, actually in the stream bottom
Do we have to look at debris?  Is clogging going to be an issue?
Alt 2 - Box Beam - Tall - adds 0.4' to the profile of the roadway.
Alt 3 - A little more invasive to the car wash parcel on the north end
Per Bob - Touby run has way too much debris.  The three span should be eliminated.  It will clog.  We will eliminate that option due to the fear of the stream clogging.
Three sided - almost too wide as is.  The twin structure there now has one barrel that functions, the other silts in too much.  Because of that, we'll probably be fighting silting with a wider bottom, slower flow.
Three sided box versus single span - Piling will increase the cost significantly.
Bob - railing type?  Currently planning on a solid parapet.  Mansfield does not like that, plus we are adding to the height of the weir condition for overtopping.  We would now like to find something that both protects the pedestrians on the sidewalks from falling and allows for water flow through the railing structure.
Between 1, 2, and 3, we are talking about cost, maintenance ease, etc.  Hydraulically, they are almost identical.
Concerns were brought up about the width of the structure for the three sided.  EMH&T is concerned that velocity is slow enough that deposition will be an issue.
Threw out this option
Box Beam has concerns regarding maintenance, i.e. spalling on the boxes, strands showing, etc., along with the possibility of the beams floating, and structure life.
Mansfield is leaning towards a single span reinforced slab bridge.
EA is investigating the hand rail issues as discussed previously.  
EA will soon submit reports for approval.
The question was raised based on the schedules for the drainage project.  THIS PROJECT will be completed approximately 1 year PRIOR to the drainage project completion.  The hydraulics that this project is based on won't be in place until a year from construction of this project.
Even if the drainage project never get completed, what we are proposing is significantly better than it is existing.
EA states that they should be able to have an AER to EMT&T by Friday, 08 November and then two weeks after to get to us.
FAA and Floodplain coordination will be handled by EA.  Adam and Kenny will assist as needed.
EA Requesting that we release SAFe as soon as possible on submission of the AER so they can jump on design as soon as possible.