Brushy Mtn Tunnel elevation profile
Just completed compiling the tunnel data taken with the Hilti Laser level.
This data is important because it tells us how high the planned curbs need to be to have the condensation coming from the tunnel walls flow out the west end of the tunnel. Since conjecture and “perception” had people telling me that there was a high spot in the middle of the tunnel and water was pooling east or west of that point, was that indeed true? I hoped not as it would be difficult to ever get water out of the east end of the tunnel.
Hilti to the rescue. I went by Hilti to discuss attachment methods to concrete. They were very helpful and offered to loan me one of their precision laser levels (discussed in previous post). I finally had the technology that would allow me to take accurate data on the grade within the Brushy Mtn Tunnel.
Data Summary:
Most important, the tunnel elevation drops 30″ east to west. That is very good news, it means we can get the water out the west end of the tunnel where we have natural drainage. Unlike the east entrance that is about 10″ below the road grade apex. The plotted data showed the North side to have a 1.8″ trough between the 220-360 ft marks. So, we will need a curb height of at least 2″ in this section to contain the water. (click images to enlarge).
Tunnel Elevation Profile North Wall Data & Plot
Tunnel Elevation Profile North Wall
Tunnel Elevation Profile South Wall Data & Plot
Tunnel Elevation Profile South Wall
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