2015-06-04_REVISION - M1977376 ‎(6)‎

• Permit No: M1977376
• IBM Index Class Name: REVISION
• Doc Date: 6/4/2015
• Doc Name: Request TR02
• From: Tuttle & Assoc.
• To: DRMS
• Type & Sequence: TR2
• Email Name: TC1
• Email Name: WHE
• Media Type: d
• Archive: No

Rock_Chute.xls
Page 3 of 3
Rock Chute Design Calculations
(Version WI -July -2010, Based on Design of Rock Chutes by Robinson, Rice, Kadavy, ASAE, 1998)
Project: Canyon Dolomite - Old Quarry County: Fremont County, CO
Designer: John Jankousky Checked by:
Date: 5/28/2015 Date:
V. Calculate the rock chute parameters W/o a factor of safety applied)
High Flow
%=
1.14 cros/m
D50 (mm) = 347.31 - (13.67 in.)
n =
0.056
Z1 =
0.96 ft.
A,=
7.6 ft2
Velocity =
13.00 fps
Zmean =
0.77 ft.
F1 =
2.61
Lrock apron =
17.09 ft.
Low Flow
Area Calculations
Length (- Rock CL
q1=
0.40
cros/m (Equivalent unit discharge)
Dso =
198.28 mm
(Median angular rock size)
n =
0.052
X2 = 6.00
(Manning's roughness coefficient)
z1 =
0.48
ft.
(Normal depth in the chute)
A, =
3.4
ft2
(Area associated with normal depth)
Velocity =
8.79
fps
(Velocity in chute slope)
Zmean =
0.42
ft
(Mean depth)
F1 =
2.38
(Froude number)
VI. Calculate the height of hydraulic iump height (coniugate depth)
(Length of rock outlet apron = 15*D50)
High Flow Low Flow
Z2 = 2.63 ft. Z2 = 1.29 ft. (Hydraulic jump height)
Qhigh = 98.7 cfs Qhigh = 29.6 cfs (Capacity in channel)
A2 = 29.7 ft2 A2 = 11.0 ft2 (Flow area in channel)
VII. Calculate the energy lost through the iump (absorbed by the rock)
High Flow
E, = 3.58 ft.
E2 = 2.81 ft.
RE = 21.72
Calculate Quantities for Rock Chute
Rock Riprap Volume --
Area Calculations
Length (- Rock CL
h = 2.63
Inlet= 16.82
x1 = 6.71
Outlet = 21.47
L = 5.88
Slope = 288.62
As = 17.64
2.5:1 Lip = 2.38
X2 = 6.00
Total = 329.29 ft.
Ab = 40.25
Rock Volume
Ab+2*AS = 75.53 ft2
921.21 yds
--Geotextile Quantity
Width Length 91) Bot Rock
2*Slope = 25.18 Total = 329.27 ft.
Bottom = 7.42 Geotextile Area
Total = 32.59 1192.47 yd2
Low Flow
E1 = 1.68 ft. (Total energy before the jump)
E2 = 1.40 ft. (Total energy after the jump)
RE = 16.92 % (Relative loss of energy)
Area Calculations
h = 5.63
X, = 0.00
L = 12.59
As = 0.00
X2 = 0.00
Ab = 0.00
Ab+2*A$ = 0.00 ft2
Bedding Thickness
t,, t2 = 0.00 in.
Length t9b Bed CL
Total = 329.27 ft.
Bedding Volume
0.00 yd3
Nobe: 1) The radius is not considered when calculating
quantities of riprap, bedding, or geotextile.
2) The geotextile quantity does not include over -
overlapping (18 -in. min.) or anchoring material
(18 -in. min. along sides, 24 -in. min. on ends).