slope and grade?

[Anonymous]

I draw two rectangles with polyline. By using Contour Utility of Terrain menu, I convert the rectangles to be contours and using Edit Elevation to +8 for outer contour and +12 for other contour.

Here are the descriptions:

1. Contour with elevation +8 has area 120 m x 120 m
2. Contour with elevation +12 has area 100 m x 100 m
3. Contour with elevation +8 is at the outer, or let's make it as boundary line. But do not define it as boundary. Only a presumption or an illustration.
4. Contour with elevation +12 is inside contour +8. Precisely, their center of rectangle is at a same point.
5. Horizontal distance of two contours = 10 m

Then, by using List Slope of Inquiry menu I click at two points of both contour line (precisely, at the Midpoint of the left vertical contour) from contour +12 to contour +8.

AutoCAD give results as follows:

First elev: 12.00, Second elev: 8.00, Elev diff: -4.00
Slope: -2.50:1, Grade: -40.00, Horiz dist: 10.00

My questions:
1. What the meaning of Slope: -2.50:1, Grade: -40.00?
2. How to calculate them?

Thank you very much...

Regards,
Anggidesk

[Anonymous]

for every 2.5 units H 1 unit V

it is the inverse of 4/10 or 40%>>>>1/.4= 2.5



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Joe

Joseph D. Bouza, P.E.
Civil 3D 2006
LDT 2006
Win XP pro
v 2002, sp 2
hp workstation xw4100
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wrote in message news:5785209@discussion.autodesk.com...
I draw two rectangles with polyline. By using Contour Utility of Terrain
menu, I convert the rectangles to be contours and using Edit Elevation to +8
for outer contour and +12 for other contour.

Here are the descriptions:

1. Contour with elevation +8 has area 120 m x 120 m
2. Contour with elevation +12 has area 100 m x 100 m
3. Contour with elevation +8 is at the outer, or let's make it as boundary
line. But do not define it as boundary. Only a presumption or an
illustration.
4. Contour with elevation +12 is inside contour +8. Precisely, their center
of rectangle is at a same point.
5. Horizontal distance of two contours = 10 m

Then, by using List Slope of Inquiry menu I click at two points of both
contour line (precisely, at the Midpoint of the left vertical contour) from
contour +12 to contour +8.

AutoCAD give results as follows:

First elev: 12.00, Second elev: 8.00, Elev diff: -4.00
Slope: -2.50:1, Grade: -40.00, Horiz dist: 10.00

My questions:
1. What the meaning of Slope: -2.50:1, Grade: -40.00?
2. How to calculate them?

Thank you very much...

Regards,
Anggidesk

[Anonymous]

4 divided by 10 equals 0.40. -40.00 represents a 40% down slope.

10 divided by 4 equals 2.50. The slope drops a foot for every 2.5 feet of
horizontal distance.


wrote in message news:5785209@discussion.autodesk.com...
I draw two rectangles with polyline. By using Contour Utility of Terrain
menu, I convert the rectangles to be contours and using Edit Elevation to +8
for outer contour and +12 for other contour.

Here are the descriptions:

1. Contour with elevation +8 has area 120 m x 120 m
2. Contour with elevation +12 has area 100 m x 100 m
3. Contour with elevation +8 is at the outer, or let's make it as boundary
line. But do not define it as boundary. Only a presumption or an
illustration.
4. Contour with elevation +12 is inside contour +8. Precisely, their center
of rectangle is at a same point.
5. Horizontal distance of two contours = 10 m

Then, by using List Slope of Inquiry menu I click at two points of both
contour line (precisely, at the Midpoint of the left vertical contour) from
contour +12 to contour +8.

AutoCAD give results as follows:

First elev: 12.00, Second elev: 8.00, Elev diff: -4.00
Slope: -2.50:1, Grade: -40.00, Horiz dist: 10.00

My questions:
1. What the meaning of Slope: -2.50:1, Grade: -40.00?
2. How to calculate them?

Thank you very much...

Regards,
Anggidesk

[auzzie2776]

sounds like basic trig to me