1987-12-01_PERMIT FILE - C1981017 ‎(111)‎

• Permit No: C1981017
• IBM Index Class Name: PERMIT FILE
• Doc Date: 12/1/1987
• Doc Name: Morrison Knudsen Haul Road Drainage Control Plan
• Section_Exhibit Name: Chapter II Attachment 2 to Appendix II-B-7
• Media Type: D
• Archive: No

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TABLE 1
DRAINAGE SUB-BASINS FOR ROAD SYSTEMS AREA
Estimated
Time of
Culvert Drainage Channel Highest Lowest Elevation Average Concentration
Number Area Length Elevation Elevation Difference Slope (Mi )
(Sq. Mi.) (Ft.) (Ft.) (Ft.) (Ft.) (t) 22
. f
1
A-1 9.94 26,500 11,480 8,040 3,440 13.0 45
A-2 0.01 15 � -
A-3 0.01 15
A-4 0.02 15
A-5 0.03 15
A-6 1.47 14,800 11,850 8,540 3,310 22.4 20
B-1 0.04 15
B-2 0.08 15
C-1 1.87 8,920 11,750 8,940 2,810 31.5 15
C-2 0.03 15
•D-1 0.04 15
E-1 0.03 15
E-2 1.45 14,300 11,850 8,610 3,240 22.7 20
E-3 0.02 15
F-1 0.10 15
F-2 0.02 15
G-1 0.08 15
G-2 0.05 15
G-3 0.01 15
G-4 0.20 15
G-5 0.92 8,100 11,545 9,130 2,415 29.8 15
G-6 2.26 11,350 11,650 9,220 2,430 21.4 20
G-7 0.01 is I
G-8 0.01 is j
G-9 0.02 15
G-10 0.60 15
G-11 0.49 15
G-12 1.02 9,850 11,650 9,430 2,220 22.5 15 '
1 2.34 17,000 11,300 7,880 3,420 20.1 25
2 4.47 21,600 111850 7,975 3,875 17.9 30
1/ See Plate I J{+
• l 3
2/ From Figure S-5 in Reference (4). A minimum time of concentration of 15
minutes was adopted. Sub-basins with missing data were so small that
adopted minimum times of concentration were assigned by judgment without
use of channel data.
36 � �