2022-04-04_PERMIT FILE - M2022013 ‎(38)‎

• Permit No: M2022013
• IBM Index Class Name: Permit File
• Doc Date: 4/4/2022
• Doc Name Note: Exhibit G - Flood Control Mitigation Plan
• Doc Name: Application
• From: Varra Companies, Inc.
• To: DRMS
• Email Name: RDZ
• Email Name: MAC
• Media Type: D
• Archive: No

Two Rivers Gravel Pit Mine
Riverside Berm Failure Analysis
and Flood Control Mitigation Plan
7ech"olooicess January 22,2020
SUMMARY OF CONTRACTION AND EXPANSION COEFFICIENTS
River: SPR
Reach River Sta. Contr. Expan.
Two Rivers 8880 .1 .3
Two Rivers 7340 .1 .3
Two Rivers 3051 .1 .3
Two Rivers 2034 .1 .3
Two Rivers 0 .1 .3
Profile Output Table - Standard Table 1
Reach River Sta Profile Q Total Min Ch El W.S. Elev Crit W.S. E.G. Elev E.G. Slope Vel Chnl Flow Area Top Width Froude # Chl
(cfs) (ft) (ft) (ft) (ft) (ft/ft) (ft/s) (sq ft) (ft)
Two Rivers 8880 10-yr 8500.00 4692.00 4695.38 4693.90 4695.55 0.002175 3.27 2598.37 1127.48 0.44
Two Rivers 8880 50-yr 18600.00 4692.00 4697.60 4695.07 4697.77 0.001196 3.64 5692.13 1558.42 0.36
Two Rivers 8880 100-yr 24500.00 4692.00 4698.58 4695.59 4698.77 0.000949 3.90 7241.47 1592.56 0.34
Two Rivers 7340 10-yr 8500.00 4687.00 4693.23 4690.66 4693.43 0.000976 4.21 2490.70 574.24 0.35
Two Rivers 7340 50-yr 18600.00 4687.00 4695.54 4692.19 4695.94 0.001200 6.16 3852.07 603.41 0.42
Two Rivers 7340 100-yr 24500.00 4687.00 4696.55 4692.87 4697.06 0.001318 7.07 4462.08 616.03 0.45
Two Rivers 3051 10-yr 8500.00 4679.00 4684.74 4683.91 4685.29 0.005087 6.12 1491.68 605.34 0.64
Two Rivers 3051 50-yr 18600.00 4679.00 4686.76 4685.57 4687.44 0.003844 6.91 2970.96 819.79 0.59
Two Rivers 3051 100-yr 24500.00 4679.00 4687.64 4686.24 4688.40 0.003449 7.42 3713.22 862.72 0.58
Two Rivers 2034 10-yr 8500.00 4677.00 4683.51 4680.88 4683.64 0.000705 3.36 3278.84 947.75 0.26
Two Rivers 2034 50-yr 18600.00 4677.00 4685.49 4682.35 4685.72 0.000834 4.54 5254.51 1048.38 0.30
Two Rivers 2034 100-yr 24500.00 4677.00 4686.39 4682.96 4686.68 0.000879 5.04 6219.60 1094.17 0.31
Two Rivers 0 10-yr 8500.00 4674.00 4680.70 4679.92 4681.02 0.003006 5.29 2053.83 829.79 0.50
Two Rivers 0 50-yr 18600.00 4674.00 4682.28 4680.98 4682.79 0.003004 6.68 3378.84 848.50 0.53
Two Rivers 0 100-yr 24500.00 4674.00 4683.01 4681.44 4683.64 0.003002 7.33 4007.50 853.42 0.55
pg. 55