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3 posts • Page 1 of 1
- Posts: 10
- Joined: Sun Jan 01, 2017 11:10 am
I'm trying to understand the unit of measure for vertical alignment (elevation) dimensions found on valuation maps to aide in a possible model layout. For example, a map has two of the stations labeled as 394 & 395, and at station 394 it has 0.19 in the vertical alignment slot and station 395 has 0.57 for the vertical alignment. The Vertical Alignment - Max Elevation for the branch is 683.00 and the Minimum Elevation for the branch is 633.0. So, what is the height of stations 394 & 395 in like feet?
- Posts: 99
- Joined: Mon Dec 12, 2016 5:37 pm
Are you sure the 394 and 395 are stations, not mile posts? Without seeing the print I can't say, but if they're mile posts the vertical values are probably percent of delta total - in your case 683 - 633 = 50' total, so elevation at 394 would be 633' + (50' x .19) = 642.5' and 395 would be 633' +(50' x .57) = 661.5', so you're gaining 19' in a mile or .36% grade. If they really are 100' stations, there should be elevation/topo markers that would likely make the 'slot' numbers additives following a whole marker, like 635' + (12" x .19) = 635' 2.28" and 635' + (12" x .57) = 635' 6.84", so you're gaining 4.56" in 100' or .38% grade.