C150259 Feasibility Study

• Contract/PO #: C150259
• Contractor Name: Bijou Irrigation District
• Contract Type: Loan
• Water District: 1
• County: Morgan
• County: Weld
• Loan Projects - Doc Type: Feasibility Study

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Wave Runup and Freeboard Computations
Reference: USBR ACER TM No.2, 1981

Project:

Figure 2
Project # 07-155

Empire Reservoir - Section 1, Fetch B
Sta 150+00 to 160+00

Enter values in blue boxes

Normal or Minimum Freeboard?

~ normal ~(enter "normal" or "minimum")

For normal freeboard use maximum expected wind values
For minimum freeboard use moderate winds, defined as:
"... winds in terms of velocity, duration, direction, and seasonal distribution that may
reasonably occur concurrently with maximum pool levels" (pg 15)

Step a) Effective Fetch

F.

L X j COS a I
L cos a I

Effective Fetch, Fe
X1,mi X2, mi
(top of (maximum
conservation water
ai, deg cos(ai) pool) surface) X1(cos(a;))2 X2(cos(aj))2
42 0.743 2.107 1.16 0.00
36 0.809 2.053 1.34 0.00
30 0.866 2.028 1.52 0.00
24 0.914 2.084 1.74 0.00
18 0.951 2.041 1.85 0.00
12 0.978 1.670 1.60 0.00
6 0.995 1.718 1.70 0.00
0 1.000 1.863 1.86 0.00
6 0.995 2.207 2.18 0.00
12 0.978 2.202 2.11 0.00
18 0.951 1.330 1.20 0.00
24 0.914 1.805 1.51 0.00
30 0.866 2.050 1.54 0.00
36 0.809 1.817 1.19 0.00
42 0.743 1.489 0.82 0.00
Total 13.511 23.32 0.00

Fe1 =
Fe2 =

23.32/13.511 =
N/A

1.73
N/A

miles (top of conservation pool)
miles (maximum water surface)

Page 1 of 4

Filename: Freeboard Wave Runup.xls
11/29/2007