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Grading a Building on a Slope

Lecture on how to grade a building pad and swale on a slope for LArch 321.
by Timothy Johnson on 3 February 2014

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Transcript of Grading a Building on a Slope

Building
SlopeSlopeSlopeSlope
TerraceTerraceTerrace
SlopeSlopeSlopeSlope
Grading a Terrace
Creating "level" areas for human activities...
Three methods: cut, fill and cut/fill
Grading a Swale
SwaleSwaleSwaleSw
ale
a
leSwaleSwaleSwale
Swales collect and direct water...collect and direct water...
Swales collect and direct water...collect and direct water...
Sw
SlopeSlo
TerraceTerraceTerrace
SlopeSlopeSlopeSlope
Grading a Building & Swale
Adding a building to a slope creates new problems.........
Swales help us solve these...
peSlope
Swa
le
Swale
Building
Building

"Pad" Elevation
Outside corner elevations
3.
Set Elevations:
21.30
21.30
21.30
21.30
2.

Existing Flow
Flow to protect building
Diagram Water:

Slope orientation
Building orientation
Solar orientation
Site Features
1.
Building & Slope:

Locate HPS at natural HP
Locate LPS below edge of bldg.
Allow space between bldg. & swale
Think about use areas...
4.
Locate HPS, LPS:
21.30
21.30
21.30
21.30
HPS
LPS
LPS
locate HPS at
natural HP
allow space to grade
within acceptable parameters
allow space to grade
within acceptable parameters
locate LPS to get water past
the building, then return to grade

Slope standards
Use of area
Adjacent structures
Existing vegetation
5.
Set HPS Elevation:

Set at existing grade
"Return to grade"
6.
Set LPS Elevation:

Scale length of centerline (H)
Subtract LPS from HPS to get "V"
Use slope formula to calculate slope
Verify slope is within acceptable range
7.
Calculate CL Slope:
Interpolate to find
existing elevation at HPS
Interpolate to find
existing elevation at HPS
East Swale:
V = 1.6'
H = 64'
1.6/64' = 2.50%
West Swale:
V = 3.4'
H = 95'
3.4/95' = 3.58%

Calculate distance to whole #contour
Calculate spacing of 1' contours
Check critical grades at corners
8.
Locate CL Contours:
4' to 21 contour
2.8' to 21 contour
35.5' between 1' contours
28' between 1' contours
21
20
19
18
21
20

Calculate distance to whole #contour
Use slope criteria
9.
Locate Contours
Adjacent to Pad:

Connect contours to swale contours
Connect contours to existing grade
10.
Final Contours:

@ grade
just past building
think about side slopes
keep water flowing on-site
return to natural flow
LPS Rules:
V = .10
G = .0358
H = .10/.0358
H = 2.8'
V = 1
G = .0358
H = 1/.0358
H = 27.9'
V = 1
G = .025
H = 1/.025
H = 40'
V = .10
G = .025
H = .10/.025
H = 4'
V = .30
G = .05
H = .30/.05
H = 6' to 21 contour
6'
?
?
?
Work from Building...
% ?
Newly purchased engineer's scale...
20.80
H = 10'
G = .05
V = 10 * .05
V = .5
4'
High Point:
10' @ 2%
V = -.20

High Point:
10' @ 2%
V = -.20
21.3 - .2 = 21.10 HP
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