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Now let me show you how to use the Construction Master 5's right angle
solution keys to figure the drop or slope of a pad or a driveway - something
you want to drain.
Say that you've got a driveway that's 47 feet 7 inches
long. We'll call that the run
and we want it to drop or fall at a quarter-inch per foot. one-quarter inch is our
pitch. Now we hit the rise key to give me the vertical change or vertical distance
and that's going to be 11
and 7/8 inches
lower at the far end than at this end.
And you say, well, you know that may be a little bit less. Let me see what an eighth is. Let me go 1/8 inch
per foot
hit the rise key again.
5 and 15/16. Well I can do that. I can dig that low. That'll
work fine. Another thing you can look at is what the percent grade is or
slope.
When it was an eighth inch -
.6 degrees or 1.04 percent.
Say that you have another situation where you've got a lot that
slopes from the back down toward the street and you're wondering whether it's going to drain
or not.
You measured out and it's say 137 feet
9 inches is the total run.
And you measured it and it's 2 feet 10 inches lower at the other end than
this end. 2 feet 10 inches is the vertical change. It's really a drop but I enter
that as rise and now I calculate what that slope is.
A quarter-inch per foot is what it comes out to be, which is good.
Another way to look at that is 1.18 degrees
or basically a two percent grade.
So that's a quick overview on the right angle function used for slopes and drops. For
more details you can download our user guide at www.calculated.com/support