Calculate slope as slope=(y2-y1)/(t2-t1).
slope = rise divided by run
slope=rise/run in other words: slope= y-axis/x-axis
You need two points before you can calculate the slope.
I am not sure what you mean; I guess some symbols disappeared when posting the question. I assume you have two given points. The idea is to calculate the slope as: slope = (difference in y-coordinates) / (difference in x-coordinates)
Calculate slope as slope=(y2-y1)/(t2-t1).
slope = rise divided by run
the formula used to calculate a slope is: m=y2-y1/x2-x1
Given one invert, and the length of the pipe and the slope of the pipe, you multiply the the length of the pipe by it's slope (expressed as a decimal ratio) and add the result to the known invert.
To calculate the number of manhole rings needed to reach cover levels, you first need to determine the desired cover level. Then, measure the height of each manhole ring and divide the desired cover level by this measurement to find the number of rings required. Round up to the nearest whole number to ensure proper cover level.
You cannot: the slope is not defined.
2 ordered pairs are needed to calculate slope.
slope=rise/run in other words: slope= y-axis/x-axis
The Manhole happened in 1988.
Invert elevations can usually be found directly on as-built drawings of the sewer facility. The simplest way to calculate an invert elevation of a manhole is to measure the depth of the manhole from the surface to the pipe invert. The invert elevation equals the ground or rim elevation minus this depth. If you do not know the rim elevation or invert elevation, a surveyor must measure the invert and/or rim elevation with reference to a nearby elevation benchmark (see: http://commons.wikimedia.org/wiki/Image:Elevation_Benchmark.jpg). Also, upstream and downstream invert elevations in a manhole typically differ by about 0.1 feet.
You need two points before you can calculate the slope.
30ft