Revised_Final_Fish_Passage_Memo.pdf

Memo

To: Dean Friesen, P.E.

From: Alex Heller, E.I. Email: dean.friesen@atkinsglobal.com

Phone: (303) 221-7275 Date: Aug 2, 2016

Ref: cc: Jacob Beedle, P.E.; KC Robinson, P.E.

Subject: Beartooth Highway Fish Passage – Final Recommendations

This memo summarizes the final design recommendations for the elliptical pipe arch culvert at Station 47+021.296 along Beartooth Highway. The analysis was completed using HEC-RAS 5.0 modeling software using the following culvert input parameters:

2400 mm equivalent diameter arch or elliptical pipe culvert (2900 mm x 1960 mm arch with buried bottom)

600 mm gravel fill

Manning’s n (corrugated metal) = 0.028

Manning’s n (gravel) = 0.030

Two HEC-RAS models were run; one with the proposed stilling basin and the other without the stilling basin.

Both alternatives resulted in the same output velocity of 0.87 m/s, which meets the criteria of achieving a velocity less than 0.91 m/s (3 fps) for the 2-year storm event. Therefore, the stilling basin can be eliminated from the design as it does not affect the downstream velocities. Slopes upstream and downstream of the culvert were also adjusted to 2.4% (from 1.5%) to account for flattening of the fish passage.

Final culvert recommendations are as follows:

Invert In: 2871.28 m

Invert Out: 2870.98 m

Culvert Output Velocity: 0.87 m/s

Slope: 0.75%

2400 mm equivalent diameter arch or elliptical pipe culvert (2900 mm x 1960 mm arch with buried bottom)

0 20 40 60 80

Beartooth Fish Passage Plan: 2 and 50 yr Flow - RaiseNoStill 8/2/2016

Main Channel Distance (m)

E le v a ti o n m

Legend

EG 2-yr

WS 2-yr

Crit 2-yr

Ground

River Main

Plan: nostillRasie1 River Main RS: 31.5 Culv Group: Culvert #1 Profile: 2-yr

Q Culv Group (m3/s) 1.23 Culv Full Len (m)

# Barrels 1 Culv Vel US (m/s) 1.23

Q Barrel (m3/s) 1.23 Culv Vel DS (m/s) 0.87

E.G. US. (m) 2872.35 Culv Inv El Up (m) 2871.28

W.S. US. (m) 2872.27 Culv Inv El Dn (m) 2870.98

E.G. DS (m) 2872.13 Culv Frctn Ls (m) 0.00

W.S. DS (m) 2871.99 Culv Exit Loss (m) 0.00

Delta EG (m) 0.22 Culv Entr Loss (m) 0.04

Delta WS (m) 0.28 Q Weir (m3/s)

E.G. IC (m) 2872.28 Weir Sta Lft (m)

E.G. OC (m) 2872.35 Weir Sta Rgt (m)

Culvert Control Outlet Weir Submerg

Culv WS Inlet (m) 2872.23 Weir Max Depth (m)

Culv WS Outlet (m) 2872.09 Weir Avg Depth (m)

Culv Nml Depth (m) 0.34 Weir Flow Area (m2)

Culv Crt Depth (m) 0.27 Min El Weir Flow (m) 2875.90

HEC-RAS Plan: nostillRasie1 River: River Reach: Main Profile: 2-yr

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

(m3/s) (m) (m) (m) (m) (m/m) (m/s) (m2) (m)

Main 54 2-yr 1.23 2871.93 2872.27 2872.27 2872.40 0.020617 1.59 0.77 3.07 1.01

Main 31.5 Culvert

Main 9.52 2-yr 1.23 2871.63 2871.99 2871.99 2872.13 0.020214 1.66 0.74 2.61 1.00

Main 1.8 2-yr 1.23 2871.43 2871.79 2871.79 2871.94 0.020855 1.70 0.72 2.49 1.01

Main 0 2-yr 1.23 2871.33 2871.67 2871.67 2871.81 0.020363 1.61 0.76 2.91 1.01

Main -22 2-yr 1.23 2870.20 2870.74 2870.70 2870.85 0.015013 1.46 0.84 2.83 0.85

0 2 4 6 8 10 12 14 16 2871.8

2872.0

2872.2

2872.4

2872.6

2872.8

2873.0

2873.2

2873.4

2873.6

Beartooth Fish Passage Plan: 2 and 50 yr Flow - RaiseNoStill 8/2/2016 US Road XS

Station (m)

E le v a ti o n m

Legend

EG 2-yr

WS 2-yr

Crit 2-yr

Ground

Bank Sta

.045 .035 .045

0 2 4 6 8 2871.3

2871.4

2871.5

2871.6

2871.7

2871.8

2871.9

2872.0

Beartooth Fish Passage Plan: 2 and 50 yr Flow - RaiseNoStill 8/2/2016 DS Cross Section

Station (m)

E le v a ti o n m

Legend

EG 2-yr

WS 2-yr

Crit 2-yr

Ground

0 20 40 60 80

Beartooth Fish Passage Plan: 2 and 50 yr Flow - raise 1ft 8/2/2016

Main Channel Distance (m)

E le v a ti o n m

Legend

EG 2-yr

WS 2-yr

Crit 2-yr

Ground

River Main

Plan: Raise1 River Main RS: 31.5 Culv Group: Culvert #1 Profile: 2-yr

Q Culv Group (m3/s) 1.23 Culv Full Len (m)

# Barrels 1 Culv Vel US (m/s) 1.23

Q Barrel (m3/s) 1.23 Culv Vel DS (m/s) 0.87

E.G. US. (m) 2872.35 Culv Inv El Up (m) 2871.28

W.S. US. (m) 2872.27 Culv Inv El Dn (m) 2870.98

E.G. DS (m) 2872.13 Culv Frctn Ls (m) 0.00

W.S. DS (m) 2871.99 Culv Exit Loss (m) 0.00

Delta EG (m) 0.22 Culv Entr Loss (m) 0.04

Delta WS (m) 0.28 Q Weir (m3/s)

E.G. IC (m) 2872.28 Weir Sta Lft (m)

E.G. OC (m) 2872.35 Weir Sta Rgt (m)

Culvert Control Outlet Weir Submerg

Culv WS Inlet (m) 2872.23 Weir Max Depth (m)

Culv WS Outlet (m) 2872.09 Weir Avg Depth (m)

Culv Nml Depth (m) 0.34 Weir Flow Area (m2)

Culv Crt Depth (m) 0.27 Min El Weir Flow (m) 2875.90

HEC-RAS Plan: Raise1 River: River Reach: Main Profile: 2-yr

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

(m3/s) (m) (m) (m) (m) (m/m) (m/s) (m2) (m)

Main 54 2-yr 1.23 2871.93 2872.27 2872.27 2872.40 0.020617 1.59 0.77 3.07 1.01

Main 31.5 Culvert

Main 9.52 2-yr 1.23 2871.63 2871.99 2871.99 2872.13 0.020214 1.66 0.74 2.61 1.00

Main 7.52 2-yr 1.23 2870.53 2871.95 2871.95 0.000030 0.15 8.06 7.33 0.05

Main 3.76 2-yr 1.23 2870.53 2871.95 2871.95 0.000030 0.15 8.14 7.43 0.05

Main 1.8 2-yr 1.23 2871.43 2871.79 2871.79 2871.94 0.020855 1.70 0.72 2.49 1.01

Main 0 2-yr 1.23 2871.33 2871.67 2871.67 2871.81 0.020363 1.61 0.76 2.91 1.01

Main -22 2-yr 1.23 2870.20 2870.74 2870.70 2870.85 0.015013 1.46 0.84 2.83 0.85

0 2 4 6 8 10 12 14 16 2871.8

2872.0

2872.2

2872.4

2872.6

2872.8

2873.0

2873.2

2873.4

2873.6

Beartooth Fish Passage Plan: 2 and 50 yr Flow - raise 1ft 8/2/2016 US Road XS

Station (m)

E le v a ti o n m

Legend

EG 2-yr

WS 2-yr

Crit 2-yr

Ground

0 2 4 6 8 2871.3

2871.4

2871.5

2871.6

2871.7

2871.8

2871.9

2872.0

Beartooth Fish Passage Plan: 2 and 50 yr Flow - raise 1ft 8/2/2016 DS Cross Section

Station (m)

E le v a ti o n m

Legend

EG 2-yr

WS 2-yr

Crit 2-yr

Ground