2013-10-31_REVISION - M1977284 ‎(3)‎

• Permit No: M1977284
• IBM Index Class Name: REVISION
• Doc Date: 10/31/2013
• Doc Name: Drainage Design Plan Mineral Joe Mine
• From: Cotter
• To: DRMS
• Type & Sequence: AM1
• Email Name: TC1
• Email Name: SJM
• Media Type: D
• Archive: No

Mineral Joe Mine - Drainage Design Plan 35
5.2 Diversion Structure Capacity
The conveyance capacity of diversion structures is dependent on stage (i.e., flow depth) within the design
constraints input to the model (and as constructed on site). Table 18 lists the conveyance capacity in cfs for
stages ranging from 0 ft to 5 ft. Interpolating between the stage values shown in Table 18 indicates that the
UDS can pass the 100 -year 24 -hr peak flow rate (Q100) with a channel depth of 1.675 feet (Table 19). As
currently constructed, the UDS has adequate capacity to accommodate flow depths of 1.94 feet or greater
(Attachment 3). However, the stability analysis for the UDS (discussed in Section 5.3) required a redesign
of the channel. The redesigned UDS can pass the 100 -year 24 -hr peak flow rate (Qioo) with a channel
depth of 1.496 feet (Table 19).
The MDS can pass the 100 -year 24 -hr peak flow rate (Qioo) with a channel depth of 0.089 feet (Table 19),
based on interpolating between the stage values shown in Table 18. The lower diversion structure LDS -N
and borrow ditch NJR will convey the 100 -year 24 -hr peak flow rate (Qioo) with channel depths of 0.21 and
0.06 feet (Table 19), while the LDS -E will convey the 100 -year 24 -hr peak flow rate (Q100) with a channel
depth of 0.17 ft.
Table 18. Conveyance Capacity for Diversion Structures
Reach
0.000
0
End
Top
Friction
Identifier
Stage
Flow
Area
Width
Slope
2.0
(ft)
(cfs)
(sq ft)
(ft)
(ft /ft)
-------------------------------------------------------------------------------
UDS (existing)0.0
0.000
0
2
0.0880
2 0.1773
0.5
7.042
1.5
4
1.0
47.386
1.0
27.221
4.0
6
16
14
2.0
119.676
12
10
5.0
1026.333
60
22
UDS (planned)
0.0
0.000
0
2
0.0880
0.5
7.980
1.8
5
1.0
33.384
5
8
2.0
159.155
16
14
5.0
1479.465
85
32
BIDS
0.0
0.000
0
0.9
0.0933
0.5
6.890
1.7
5.7
1.0
36.160
5.7
10.5
2.0
206.009
21
20.1
5.0
2210.885
124.5
48.9
LDS -E
0.0
0.000
0
1.8
0.0800
0.5
8.347
1.8
5.2
1.0
36.517
5.2
8.6
2.0
181.382
17.2
15.4
5.0
1749.434
94
35.8
LDS -N
0.0
0.000
0
1.7
0.0794
0.5
6.470
1.6
4.8
1.0
28.096
4.8
7.9
2.0
138.655
15.8
14.1
5.0
1329.909
86
32.7
SWRP -Inl 0.0
0.000
0
2 0.1907
0.5
11.747
1.8
5
1.0
49.144
5
8
2.0
234.291
16
14
5.0
2177.904
85
32
SWRP -In2 0.0
0.000
0
2 0.1773
0.5
11.327
1.8
5
1.0
47.386
5
8
2.0
225.909
16
14
5.0
2099.993
85
32
NJR 0.0 0.000 0 1.5 0.0443
414813.131029 Whetstone Associates •