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

Figure 8 Rock Dam 3 Cross-Section
Cross-section 8
Elevation, ft
Rock Structure Channel Low Flow Elev.
577
576
572.6 ft
572.76 ft
575
574
573
572
571
570
569
640 650 660 670 680 690 700 710 720
Station, ft
Figure 9 shows the profile of the stretch of Swan Creek through Highland Park with the proposed rock
dams. The low flow (30 cfs) is shown over the rock dams and also under existing conditions. See Table
4 for a comparison of WSE between the existing and proposed conditions model at 30 cfs. There is no
difference between the two profiles downstream of the proposed cross-sections.
Table 4 Comparison of WSE for Existing and Proposed Conditions at 30 cfs
30 cfs
SECTIO
N NO. CROSS-SECTION
RIVER
MILES
WSE
(Proposed)
WSE
(Existing)
DIFFERENCE
(P-E)
24.318 18 4.02 571.76 571.76 0
24.327 17 4.08 571.78 571.78 0
24.336 16 4.11 571.78 571.78 0
24.345 15 4.14 571.8 571.8 0
24.354 14 4.18 571.81 571.81 0
24.363 13 4.21 571.81 571.81 0
24.372 12 4.25 571.82 571.82 0
24.381 11 4.30 571.82 571.82 0
24.39 10 4.38 571.82 571.82 0
24.4 Ped Bridge 4.40 571.82 571.82 0
24.409 9 4.41 572.04 572.04 0
24.418 8 4.42 572.06 572.07 -0.01
24.428 8 - proposed rock crest 4.43 572.76
24.438 8 - proposed pool 4.43 572.86
24.447 7 - proposed rock crest 4.45 573.26
24.457 7 - pool 4.45 573.36 572.08 1.28
24.466 6 - proposed rock crest 4.47 573.74
12