2013-02-20_REPORT - M1980244

• Permit No: M1980244
• IBM Index Class Name: REPORT
• Doc Date: 2/20/2013
• Doc Name: Response to Concrete Spec. and CDOT Inquiry.
• From: CC&V
• To: DRMS
• Email Name: TC1
• Media Type: D
• Archive: No

Turbulent Flow
Particle Effective
Size Range Size Permeability
Millimeters (inches) Coefficient k
D max
D min D20 mm cm /s
(inches)
Derrick STONE
3000 (120)
900 (36) 1200 (48) 100
One -man STONE
300 (12)
100 (4) 150 (6) 30
Clean, fine to coarse
80 (3)
10 ('' /4) 13 ('' /Z) 10
GRAVEL
Fine, uniform
GRAVEL
8 (
1.5 ( 3 (' /e) 5
Very coarse, clean,
uniform SAND
3 ('/s)
0.8 ('/ 1.5 ( 3
Laminar Flow
Uniform, coarse
2 (' /s)
0.5 ( /64) 0.6 0.4
SAND
Uniform, medium
SAND
0.5
0.25 0.3 0.1
Clean, well - graded
SAND & GRAVEL
10
0.05 0.1 0.01
Uniform, fine SAND
0.25
0.05 0.06 40 x 10 -4
Well- graded, silty
SAND & GRAVEL
5
0.01 0.02 4 x 10
Silty SAND
2
0.005 0.01 1.0 x 10
Uniform SILT
0.05
0.005 0.006 0.5 x 10 -4
Sandy CLAY
1.0
0.001 0.002 0.05 x 10
Silty CLAY
0.05
0.001 0.0015 0.01 x 10
CLAY (30% to 50%
clay sizes)
0.05
0.0005 0.0008 0.001 x 10
Colloidal CLAY ( -2
0.01
10 40 10
µm 50 %)
' Basic Soils Engineering, R.K. Hough, 2nd Edition, Ronald Pess Co.; 1969,
Page 76.
Note: Since the permeability coefficient of the soil will be unknown in most non-
critical, non - severe applications for erosion control and drainage, the soil-
permeability coefficients listed in Table 712 -2 may be used as a guide for
comparing the permeability coefficient of the fabric with that of the in-
place soil
CC &V PROJECT NO. SC -07 -002
REVISION OF SECTION 712
GEOTEXTILES
Section 712 of the Standard Specifications is hereby revised for this project as follows:
In subsection 712.08, third paragraph, delete the last sentence and replace with the following:
The current list of products that meet these requirements is located at: https: / /www.dot.ny.gov.
In subsection 712.08, delete Table 712 -2 and replace with the following
Table 712 -2
TYPICAL VALUES OF PERMEABILITY COEFFICIENTS'
January 20, 2012