Salt Lake County June 2010 Flooding and Restoration
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1 Salt Lake County June 2010 Flooding and Restoration Little Cottonwood (LCC) and Big Cottonwood (BCC) Kade Moncur, PE, CFM Salt Lake County Engineering August 10 th - 12 th SLCo Symposium 2011
2 August 10 th - 12 th SLCo Symposium 2011
3 Cause of the June 2010 Flooding Cool temperatures during early to mid Spring, which delayed snowmelt runoff from LCC and BCC June rainfall along with rapidly increasing temperatures for several days in a row Resulting in higher than average spring runoff of LCC and BCC August 10 th - 12 th SLCo Symposium 2011
4 LCC & BCC Peak Flows Drainage Area FEMA FIS Q100 June 2010 Peak Q June 2011 Peak Q Flooding Source (sqmi) (cfs) (cfs) (cfs) Little Cottonwood Creek 46 A bo ve Wheeler F arm D ebris B asin - 1, B elo w Wheeler F arm D ebris B asin - 1, Big Cottonwood Creek 50 1, Overbank flooding of Little Cottonwood Creek below the Wheeler Farms Debris Basin will start around 700 cfs The 1983 flood peak runoff for LCC was 1,135 cfs. August 10 th - 12 th SLCo Symposium 2011
5 Emergency Response Efforts and Costs 2010 & 2011 Emergency Response Efforts 24-hr Flood Watch Sandbagging in Critical Areas Placement of Riprap Along the Channel Banks Clearing of Debris Blocking Culverts and Bridges 2010 Flood Response Cost: 2011 Flood Response Cost: $571, Agency Agency Total Unified Fire Authority $382, Unified Police Department $43, Midvale City $46, Sandy City $17, Murray City $2, Salt Lake City $ VECC $2, August 10 th - 12 th Total: SLCo $492, Symposium 2011
6 Disaster Relief No Relief from FEMA Needed Approximately 2.9 million in Damage to Public Infrastructure. Funding from NRCS under National Emergency Watershed Protection Program (EWP) 3.3 million for 2010 Maybe 3.3 million more in 2011 SLCo will match funding to 25% EWP funds will not be used for any of the following: Increase the pre-disaster capacity of a channel by constructing a new channel, enlarging the old channel or relocating the stream. Modifying the channel based upon regional curve data which maintains the same channel capacity upstream and downstream, and is necessary to stabilize the channel, is allowable. Sediment and debris removal is not considered new construction. August 10 th - 12 th SLCo Symposium 2011
7 Wasatch Resort August 10 th - 12 th SLCo Symposium 2011
8 3700 E to 4000 E Above Wasatch Blvd August 10 th - 12 th SLCo Symposium 2011
9 Upper Rails Debris Structure Below Wasatch Blvd. August 10 th - 12 th SLCo Symposium 2011
10 Cobble Canyon Lane to Willow Creek Drive August 10 th - 12 th SLCo Symposium 2011
11 LCC at Crestwood Park August 10 th - 12 th SLCo Symposium 2011
12 Through Union Park Ave & Fort Union Blvd August 10 th - 12 th SLCo Symposium 2011
13 LCC Wheeler Farm August 10 th - 12 th SLCo Symposium 2011
14 LCC Murray Pk tovine Street August 10 th - 12 th SLCo Symposium 2011
15 August 10 th - 12 th SLCo Symposium 2011
16 August 10 th - 12 th SLCo Symposium 2011
17 Elevation (ft) LCC Flood Damage Assessment Upper Reach Structure Capacity (Flood Insurance Study Model) Little Cottonwood Creek Plan: Little Cottonwood Creek 8/18/2010 Will ow Green Ci rcle Station (ft) August 10 th - 12 th SLCo Symposium 2011 Legend EG 500-year WS 500-year Crit 500-year EG 100 ENC EG 100-year WS 100 ENC WS 100-year EG 50-year WS 50-year EG 10-year Crit 100-year Crit 100 ENC WS 10-year Crit 50-year Crit 10-year 2 ft/s 4 ft/s 6 ft/s 8 ft/s 10 ft/ s Ground Levee Bank Sta Encroachment
18 LCC Flood Damage Assessment Upper Reach Structure Capacity August 10 th - 12 th SLCo Symposium 2011
19 LCC Flood Damage Assessment Field Reconnaissance August 10 th - 12 th SLCo Symposium 2011
20 LCC Flood Damage Assessment Damage Classification -- Debris August 10 th - 12 th SLCo Symposium 2011
21 LCC Flood Damage Assessment Damage Classification -- Erosion August 10 th - 12 th SLCo Symposium 2011
22 LCC Flood Damage Assessment Damage Classification -- Scour August 10 th - 12 th SLCo Symposium 2011
23 LCC Flood Damage Assessment Damage Classification Riprap and/or Rock Displacement August 10 th - 12 th SLCo Symposium 2011
24 LCC Flood Damage Assessment Damage Classification Structural Damage August 10 th - 12 th SLCo Symposium 2011
25 LCC Flood Damage Assessment Damage Classification Gabion Damage August 10 th - 12 th SLCo Symposium 2011
26 LCC Flood Damage Assessment Damage Classification -- Deposition August 10 th - 12 th SLCo Symposium 2011
27 LCC Flood Damage Assessment Damage Assessment Parameters Public infrastructure impact Pre-existing conditions contributing to damage Private encroachment Restoration work sites August 10 th - 12 th SLCo Symposium 2011
28 LCC Flood Damage Assessment Damage Prioritization High priority Debris pond deposition Structural damage Total gabion failure Severe undercutting Threat to adjacent home, infrastructure, etc. August 10 th - 12 th SLCo Symposium 2011
29 LCC Flood Damage Assessment August 10 th - 12 th SLCo Symposium 2011
30 LCC Flood Damage Assessment August 10 th - 12 th SLCo Symposium 2011
31 E to 4000 E Channel Repair
32 E to 4000 E Channel Repair - Flood
33 E to 4000 E Channel Repair - Post Flood
34 E to 4000 E Channel Repair - Construction
35 E to 4000 E Channel Repair - Construction
36 Upper Rails Access Road and Repairs Site 2 & 3 Access Road Upper Rails Repairs
37 2 & 3 Upper Rails Access Road and Repairs
38 2 Upper Rails Access Road Repairs - Construction
39 2 Upper Rails Access Road Repairs - Construction
40 2 Upper Rails Access Road Repairs - Construction
41 3 Upper Rails Repairs Pre Flood
42 3 Upper Rails Repairs Pre Flood
43 3 Upper Rails Repairs Flood
44 3 Upper Rails Repairs Construction
45 3 Upper Rails Repairs Construction
46 4 Cobble Canyon Ln. to Willow Creek Dr. Channel Repair
47 4 Cobble Canyon Ln. to Willow Creek Dr. Channel Repair
48 4 Cobble Canyon Ln. to Willow Creek Dr. Channel Repair
49 4 Cobble Canyon Ln. to Willow Creek Dr. Channel Repair -Flood
50 4 Cobble Canyon Ln. to Willow Creek Dr. Channel Repair -Flood
51 4 Cobble Canyon Ln. to Willow Creek Dr. Channel Repair -Flood
52 4 Cobble Canyon Ln. to Willow Creek Dr. Channel Repair -Construction
53 4 Cobble Canyon Ln. to Willow Creek Dr. Channel Repair -Construction
54 5 Highland Drive Gabion Repairs
55 5 Highland Drive Gabion Repairs
56 5 Highland Drive Gabion Repairs - Construction
57 5 Highland Drive Gabion Repairs - Construction
58 6 Waterside Cove Concrete Wall Repair
59 6 Waterside Cove Concrete Wall Repair
60 6 Waterside Cove Concrete Wall Repair - Flood
61 6 Waterside Cove Concrete Wall Repair - Flood
62 6 Waterside Cove Concrete Wall Repair - Construction
63 6 Waterside Cove Concrete Wall Repair - Construction
64 E Gabion Repair
65 E Gabion Repair - Post Flood
66 E Gabion Repair - Post Flood
67 E Gabion - Construction
68 E Gabion - Construction
69 8 Wheeler Farm Dredging
70 8 Wheeler Farm Dredging
71 8 Wheeler Farm Dredging - Flood
72 8 Wheeler Farm Dredging - Flood
73 8 Wheeler Farm
74 9 900 E Gabion Repair
75 9 900 E Gabion Repair
76 9 900 E Gabion Repair Flood
77 9 900 E Gabion Repair - Construction
78 9 900 E Gabion Repair Construction
79 9 900 E Gabion Repair Construction
80 10 Murray Park Channel
81 10 Murray Park Channel
82 10 Murray Park Channel Flood
83 10 Murray Park Channel Flood
84 10 Murray Park Channel Post Flood
85 10 Murray Park Channel Construction
86 10 Murray Park Channel Construction
87 Questions or Comments?
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