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2009-05-19_REVISION - M1980055HR
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2009-05-19_REVISION - M1980055HR
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Entry Properties
Last modified
6/15/2021 2:18:36 PM
Creation date
5/28/2009 7:48:50 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1980055HR
IBM Index Class Name
REVISION
Doc Date
5/19/2009
Doc Name
EPP (AM-01) Att. P: Drainage; Att. Q: SWMP Repair; Att. R: Rock & Soil Characterization (part 10)
From
Denison Mines
To
DRMS
Type & Sequence
AM1
Email Name
RCO
Media Type
D
Archive
No
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Section 4 <br />St. Jude Mine <br />Table 4-11 00-vear Peak Discharges for the St. Jude Mine Basins <br /> 100- ear mak discharge <br /> Area Calculated Increased b SE <br />Basin ac s -mi cls cfs <br />1 4.53 0.00708 3.44 6.12 <br />2 2.38 0.00371 2.17 3.85 <br />3 3.17 0.00495 2.66 .4.74 <br />4 1.77 0.00277 1.76 3.13 <br />5 0.86 0.00134 1.05 1.86 <br />4.4 Surface Water Control Structure Design <br />CDM designed two diversion channels to route offsite surface water runoff from <br />Basin 1 and Basin 2 around the surface mine facilities to the ephemeral drainages. <br />Storm water runoff from Basin 3 will be captured and detained by an existing earthen <br />berm along the crest of the WRA. Storm water runoff from Basins 4 and 5, for storm <br />events less than the 100-year storm event, will be captured in a berm and routed to a <br />catchment basin. <br />4.4.1 Channel Design <br />'10 <br />Channels 1 and 2 were designed to convey the 100-year peak discharge from Basin 1 <br />and Basin 2, respectively to the ephemeral drainages. CDM used Manning's equation <br />to calculate the flow velocity and depth in Channels 1 and 2. Flow depth and velocity <br />were calculated using the following equations for the 100-year peak discharges, cross <br />section geometry (triangular), and Manning's n values listed in Table 4-2: <br />Q = VA <br />A = (b + zh)h <br />V _ 1.49 (b+zh)h ]2/3 SI/2 <br />n b+2h 1+z2 <br />where: <br />Q = discharge in cfs <br />V = velocity in ft/sec <br />z: 1 = side slope <br />A = flow area in ft2 <br />b = bottom width of the cross section in ft <br />h = flow depth in ft <br />S = channel slope in ft/ft <br />n = Manning's roughness coefficient <br /> <br />4-2 <br />E <br />OWNS - Nniwn%Task Order 1- Sunday Mines Drainage StudyR.portTinal R.po,AFin-I Sunday Mines Drainage Repot_052208.d..
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