Highland Park Dam Mitigation Project Appendix C - Partners for ...

Velocity (ft/sec)
Cross-Section
(Nov. 2007)
Low Flow
30 cfs
1-year
2,905 cfs
2-year
3,811 cfs
10-year
5,900 cfs
50-year
8,000 cfs
100-year
9,000 cfs
7-rock crest 2.55 3.69 4 4.48 5.48 5.59
7-pool 0.18 3.22 3.6 4.2 5.18 5.33
6-rock crest 2.42 3.85 4.27 4.93 6.08 6.25
6-pool 0.13 3.09 3.57 4.36 5.44 5.67
5 0.15 2.94 3.39 4.16 5.2 5.43
4 0.3 3.29 3.8 4.63 5.78 6.02
3-existing dam 3.05 4.61 5.18 6.14 7.71 7.98
2c-rock
channeling 0.21 3.3 3.8 4.67 5.85 6.12
2b-rock
channeling 0.21 3.31 3.81 4.68 5.85 6.12
2a-rock
channeling 0.21 3.31 3.81 4.67 5.85 6.12
South Bridge 0.21 3.31 3.81 4.71 5.96 6.31
1 0.29 5.02 5.85 7.37 9.55 10.09
Table 7 shows that the proposed rock dams and upstream channeling do not affect the flood plain
downstream or upstream of the project area as compared to the base model.
Table 7 Comparison of WSE for the Proposed and Base (Existing Conditions) Model for the 100-year Event
BASE
SECTION
NO.
BASE
RIVER
MILES
WSE
(Base)
PROPOSED
SECTION
NO.
PROPOSED
RIVER
MILES
WSE
(Proposed)
DIFFERENCE
(P-B)
0.1 0.00 578.51 0.1 0.00 578.51 0
0.2 0.01 578.32 0.2 0.01 578.32 0
0.3 0.02 578.44 0.3 0.02 578.44 0
0.4 0.03 579.17 0.4 0.03 579.17 0
0.5 0.11 579.58 0.5 0.11 579.58 0
0.6 0.12 579.51 0.6 0.12 579.51 0
0.7 0.13 579.56 0.7 0.13 579.56 0
0.8 0.13 579.68 0.8 0.13 579.68 0
2 0.28 580.51 2 0.28 580.51 0
2.1 0.39 581.09 2.1 0.39 581.09 0
2.2 0.40 581.15 2.2 0.40 581.15 0
2.3 0.42 581.24 2.3 0.42 581.24 0
3 0.44 581.14 3 0.44 581.14 0
3.05 0.46 581.42 3.05 0.46 581.42 0
3.1 0.50 581.72 3.1 0.50 581.72 0
3.11 0.50 581.72 3.11 0.50 581.72 0
3.19 0.51 581.79 3.19 0.51 581.79 0
3.2 0.51 581.8 3.2 0.51 581.8 0
3.3 0.52 582.81 3.3 0.52 582.81 0
5 0.70 583.66 5 0.70 583.66 0
5.1 0.80 584.05 5.1 0.80 584.05 0
5.15 0.88 584.43 5.15 0.88 584.43 0
5.2 0.89 584.87 5.2 0.89 584.87 0
5.3 0.90 584.9 5.3 0.90 584.9 0
7 0.94 584.85 7 0.94 584.85 0
7.1 1.05 585.29 7.1 1.05 585.29 0
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