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PERMFILE43021
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PERMFILE43021
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Last modified
8/24/2016 10:45:26 PM
Creation date
11/20/2007 11:25:07 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981022
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Doc Name
DRAINAGE AND SEDIMENT CONTROL CALCULATIONS FOR HUBBARD CANYON VENTILATION FACILITIES
Section_Exhibit Name
Exhibit 2.05-E3 SECTION 4
Media Type
D
Archive
No
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Subject STORM RUNOFF CALCULATIONS. <br />Gill Slopes Below Yard <br />~a rd Canyon Ventilation Facilities No. 2 <br />• ~rset Coal Mine <br />P = 1.90 (10-24) _ (P-0.2S) <br />~ P =2.20 (25-24) Q- PP+0.8S <br />CALCULATION rJUlt-5 <br />~y hin^ <br />Checked <br />Acc' <br />.luly 14 1881 <br />~hert No.~_uf 4 Sheets <br />Map Scale 1" = 100' <br />~ TABLE 1 Area- Acre Conversion and Weighted Curve Numbers <br />I Fraction of Weighted kunoff <br />1 Area CN Sq. In. Acres ~ Total Acres_L i _CN , Calculation Data <br />r SW Culvert 87 0.940 i 0.2157 .29319 ~ 87 A14C-l1 <br />-c~+= a7 <br />` NW Culvert 87 1.015 0.2330 I ! 87 ~, <br />5= 1.49 <br />~ 1 ~ Q <br />(lci_24)= 0.8300 <br />NW Access Rd. + 87 1.250 I 0.2870 ~ 11(25-24 )= 1.0665 <br /> AMC-1 .. <br /> ' I, CN= 73 <br />+ I I I ' S= 3.70 <br />i Q('.0_24)= 0.2769 <br /> ,Q(25~24)= 0.4131 <br />i i 3.205 _0.7357 - ---______ <br />,r~,BLE 2 Weighted Quantity of Runoff <br />aMC- tt i - -- -. ... I(-- - - - - -- ----- --- <br />6 ~4- -~I-- ---r- - <br />S~tornl ~25-24 S[ornl_. ~Q-~ Stnr¢L_ <br />CN _ S IW ~~__,~~- CN-= ~_= Q ._ I~td. :, Q- Wtd <br />~ I 1I I - - <br />I ! <br />i ~ ' I I <br />i I~ <br />i <br />i ' <br />i <br />~ I <br />I' <br />, ~ i ~, I ~ <br />' I I~ I <br />( 4 <br />I i ' jl. I <br />I II ~ I I <br />I - II ~ ': i <br />ii <br />~ ~ ' <br />~~ I I: i j i it <br />T'~ <br />i ~ I u <br />~ STORM RUNOFF COMPUTATIONS: AMC-II AMC-I <br />Use argestQ. Value from Tables 1 & 2) 10-24 _ 25-24 10-24 25-24 <br />Quantity, inches runoff = O.S300 1.0665 0.2769 0.4131 <br />I <br />I Volume, Acre-feet = <br />0.0509 <br />0.0654 <br />0.0170 0.0253 <br />Cubic-feet = 2216.93 2848.60 739.51 1103.37 <br /> <br />~ak Discharge = CN 87 Steep Slopes for total area <br />.7357 Acres = Z.35cfs X0.83 1.95 cfs .572 cfs (10.24) .736 (25-24) (1) <br />X 1.0665 = 2.51 cfs 1.378 cfs (10.24) 1.774 (25-24)(2+3) <br /> Totals 1.950 2.510 <br />
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