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PERMFILE138126
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PERMFILE138126
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Last modified
8/24/2016 10:38:44 PM
Creation date
11/26/2007 7:04:37 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1991078A
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
Exhibit 09 Protection of the Hydrologic Balance
Media Type
D
Archive
Yes
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• Project Title <br />WATERSHED HYDROGRAPH <br />Inflow into structure <br />Structure type: <br />= Culvert Design - CMP #14 <br />Haul Road To Mining Area #3 <br />_ #1 <br />= Null <br />-- Watershed data for watershed #1 <br />Curve number = 64.0 <br />Area = 92.7 acres <br />Hydraulic length = 5300.0 feet <br />Elevation change = 110.0 feet <br />Concentration time = 1.46 hours <br />Concentration time type = SCS Upland Curves <br />Unit hydrograph type = Agriculture <br />-- Total Area = 92.7 acres <br />-- Storm Data - 100 year event <br />Total precipitation = 2.4 inches <br />Storm type = SCS Type 2 storm, 24 hour storm <br />Peak discharge = 3.61 cfs <br />Discharge volume = 1.82 acre feet <br />The existing 18" diameter culvert has a capacity of about 5.75 cfs <br />so it can easily pass the peak discharge of 3.61 cfs. The original <br />• design for this culvert is presented on the preceding page 9-33. <br />It was designed based on the assumption that Mining Area No. 2 <br />would be mined, therefore the drainage area for the culvert would <br />be comprised of disturbed and undisturbed areas. Since Mining Area <br />No. 2 was not disturbed, all of the area that contributes run-off <br />to this culvert remains undisturbed. <br />~la5~~~4*',~• <br />i~•' ~:~~ <br />~~ 19230/~ : ~` • <br />e <br />IAA ~ <br />• <br />9-33a <br />New September 1994 <br />
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