2015-06-04_REVISION - M1977376 ‎(6)‎

• Permit No: M1977376
• IBM Index Class Name: REVISION
• Doc Date: 6/4/2015
• Doc Name: Request TR02
• From: Tuttle & Assoc.
• To: DRMS
• Type & Sequence: TR2
• Email Name: TC1
• Email Name: WHE
• Media Type: d
• Archive: No

Canyon Dolomite - Old Quarry
Final Drainage Report
Percent Impervious Calculations and Rational Method "C" Calculations
Calculated by: John Jankousky Revision: 5/29/2015
Soil Hydrologic Group D
Land Use % Imp.
C2
CS
C10
C100
Landscape Area'
0
0.04
0.15
0.25
0.5
Railroad Yard Area
40
0.28
0.35
0.42
0.58
Gravel Street
80
0.6
0.63
0.66
0.74
Building/Roof Area
90
0.73
0.75
0.77
0.83
Pavement Area
100
0.89
0.90
0.92
0.96
For "Landscape Area", assume zero percent impervious (sandy soils)
Combined C values are equal to area weighted average, that is. C combined = summation( C , x Area, / total Area
For Basins J5 and J6 assume that haul roads and other activities result in some areas of partial imperviousness.
Basin J7 is undisturbed except for the access road.
Use 80% impervious (Gravel Street) for haul roads and access road.
Page A-4 hydrology— Canyor-Dcl mite Rev6May2015 xlsx %mp
C
n
3
v
_s
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<
N
L
7
—i
O
d
N
N
?
n
m
_
a
-
�.
-
0
3
0
3
a
_
N
D
m
D
D
D
D
D
a
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a
oa
s
n
3
n
m
m
m
m
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N
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U1
I O
1
Quarry -outlet
1,467,897
33.70
1,394,502
0
0 73,395
5.00
0.083
0.188
0.28
For "Landscape Area", assume zero percent impervious (sandy soils)
Combined C values are equal to area weighted average, that is. C combined = summation( C , x Area, / total Area
For Basins J5 and J6 assume that haul roads and other activities result in some areas of partial imperviousness.
Basin J7 is undisturbed except for the access road.
Use 80% impervious (Gravel Street) for haul roads and access road.
Page A-4 hydrology— Canyor-Dcl mite Rev6May2015 xlsx %mp