2020 Vedder River and Canal Hydraulic Profile Update May 7, 2020 - PowerPoint PPT Presentation

2020 Vedder River and Canal Hydraulic Profile Update May 7, 2020

Study Area – Vedder Canal 2 April 11, 2016 May 7, 2020

Study Area – Vedder River 3 Upper Reach Lower Reach Middle Reach April 11, 2016 May 7, 2020

Project Scopes 4 • Update the HEC-RAS hydraulic model using the 2020 channel survey with a design flow of 1470 m 3 /s and starting water level of 7.4 m at the HWY 1 Bridge • Compare the 2020, 2018, and 2016 thalweg profiles • Estimate the volume of gravel accumulation or loss using the 2020, 2018, 2016, 1996/1991 surveys • Identify areas where the desired set back dike freeboard of 0.75 m is not met • Evaluate the hydraulic effect on the 2020 candidate gravel removal sites April 11, 2016 May 7, 2020

Review of Flood Record 5 Top Five Flood (m 3 /s) Year Date 2003 1140 October 20 2006 1040 November 6 1980 856 December 26 1975 787 December 3 1979 781 December 17 Recent Peak Flow (m 3 /s) Year Return Period 2013 367 1:2 y 2014 392 1:2 y 2015 600 1:5 y 2016 340 1:2 y 2017 442 1:2 y 2020 307 1:2 y April 11, 2016 May 7, 2020

Sediment Quantities - Summary 6 2016-2018 2018-2020 2016-2020 Location Natural Deposition Natural Deposition Natural Deposition m 3 /yr m 3 /yr m 3 /yr Vedder Canal -27,200 16,600 -5,400 Vedder River 25,800 -24,700 600 Total -1,400 -8,100 -4,800 April 11, 2016 May 7, 2020

Sediment Quantities - Cumulative 7 2018-2020 2018-2020 Bed Change m 3 2018 Excavation m 3 Location Natural Deposition m 3 /yr XSC10 to XS1 (Canal) 33,155 0 16,600 XS1 to SRBC (Lower) -20,816 0 -10,400 SRBC to XS35 (Middle) -11,478 0 -5,700 XS35 to XS45 (Upper) -17,135 0 -8,600 Total -16,275 0 -8,100 2016-2020 2016-2020 Bed Change m 3 2016 Excavation m 3 Location Natural Deposition m 3 /yr XSC10 to XS1 (Canal) -38,419 -16,944 -5,400 XS1 to SRBC (Lower) 9,408 -16,566 6,500 SRBC to XS35 (Middle) -21,387 -18,593 -700 XS35 to XS45 (Upper) -61,310 -40,382 -5,200 Total -111,708 -92,485 -4,800 April 11, 2016 May 7, 2020

Long Term Sediment Quantities - Cumulative 8 1991/6-2016 Bed Change m 3 1991/6-2016 Excavation m 3 Annual Deposition m 3 /yr Location XSC10 to XS1 (Canal) -114,300 -99,900 -600 XS1 to SRBC (Lower) -148,500 -411,200 13,200 SRBC to XS35 (Middle) -105,600 -237,800 6,700 XS35 to XS45 (Upper) 104,400 -415,900 26,100 Total -264,000 -1,164,800 45,400 Location 1991/6-2018 Bed Change m 3 1991/6-2018 Excavation m 3 Annual Deposition m 3 /yr XSC10 to XS1 (Canal) -186,000 -117,800 -2,500 XS1 to SRBC (Lower) -118,000 -428,000 14,100 SRBC to XS35 (Middle) -116,000 -256,000 6,400 XS35 to XS45 (Upper) 60,000 -456,000 23,500 Total -359,000 -1,257,000 41,500 1991/6-2020 Bed Change m 3 1991/6-2020 Excavation m 3 Annual Deposition m 3 /yr Location XSC10 to XS1 (Canal) -152,500 -117,800 -1,200 XS1 to SRBC (Lower) -139,100 -428,000 12,000 SRBC to XS35 (Middle) -127,100 -256,000 5,400 XS35 to XS45 (Upper) 43,100 -456,000 20,800 Total -375,700 -1,257,000 37,000 April 11, 2016 May 7, 2020

Cross Section Gravel Quantities – Vedder River 9 BED CHANGE BED CHANGE BED CHANGE CROSS DISTANCE VOLUME VOLUME VOLUME SECTION TO D/S (m) 2016-2020 (m 3 ) 2018-2020 (m 3 ) 1996-2020 (m 3 ) XS45 169.62 350 -748 -26,489 XS44 212.92 -504 2,889 -33,386 XS43 221.05 -9,573 -1,192 -1,101 XS42 289.75 -20,262 -9,375 68,937 XS41 303.19 -12,629 -7,078 50,740 XS40 264.43 -9,248 -6,471 18,335 XS39 225.47 -6,128 -2,334 16,271 XS38 251.80 -611 4,390 221 XS37 230.76 -672 1,200 -22,872 XS36 204.57 -2,034 1,584 -27,588 March 11, 2011 April 15, 2020 May 7, 2020

Cross Section Gravel Quantities – Vedder River 10 BED CHANGE BED CHANGE BED CHANGE CROSS DISTANCE VOLUME VOLUME VOLUME SECTION TO D/S (m) 2016-2020 (m 3 ) 2018-2020 (m 3 ) 1996-2020 (m 3 ) XS35 204.85 -10,263 954 -21,962 -9,919 XS34 142.69 -6,904 -34 -13,256 XS33 165.19 -2,333 -960 -12,804 XS32 159.56 -4,575 -4,890 -7,759 XS31 143.30 -1,592 -1,700 -6,699 XS30 146.78 1,180 1,005 -4,579 XS29 135.43 387 82 -3,942 XS28 169.52 2,302 827 -4,045 XS27 147.59 2,182 44 -4,766 XS26 143.62 -211 -1,429 -4,642 XS25 116.34 -1,782 -458 XS24 78.46 -1,466 1,336 -3,934 502 XS23 80.84 1,229 1,459 -2,660 XS22 150.55 1,988 1,739 -5,578 XS21 160.14 880 678 -5,357 XS20 140.85 583 219 -6,469 XS19 126.63 380 -4,051 -6,729 XS18 78.16 -2,292 -4,853 -2,490 XS50 27.32 -1,080 -1,448 March 11, 2011 April 15, 2020 May 7, 2020

Cross Section Gravel Quantities – Vedder River 11 BED CHANGE BED CHANGE BED CHANGE CROSS DISTANCE VOLUME VOLUME VOLUME SECTION TO D/S (m) 2016-2020 (m 3 ) 2018-2020 (m 3 ) 1996-2020 (m 3 ) XS51 (SRBC) 120.45 667 -2,581 -10,101 XS16 190.13 6,530 -806 -16,047 XS15 154.57 5,627 -13 -4,763 XS14 132.73 4,244 -945 1,592 XS13 139.15 4,458 -997 -3,449 XS12 116.94 2,060 852 -7,058 XS11 175.51 -3,346 -1,541 -17,062 XS10 94.66 -4,045 -3,746 -9,313 XS9 126.44 -3,684 -3,995 -12,970 XS8 118.42 -1,469 -860 -12,906 XS7 131.03 257 -156 -5,069 XS6 71.08 524 -397 -128 XS5 125.46 160 -627 -4,796 XS4 201.70 -672 -935 -20,492 XS3 163.68 -540 -2,252 -11,689 XS2 136.11 -283 -369 -2,375 March 11, 2011 April 15, 2020 May 7, 2020

Cross Section Gravel Quantities – Vedder Canal 12 BED CHANGE BED CHANGE BED CHANGE CROSS DISTANCE VOLUME VOLUME VOLUME SECTION TO D/S (m) 2016-2020 (m 3 ) 2018-2020 (m 3 ) 1991-2020 (m 3 ) XS1 185.93 -2,443 1,452 -4,855 C37 151.48 -3,581 1,204 -6,471 C36 152.07 -2,748 1,794 -6,818 C35 152.34 -1,958 1,614 -6,021 C34 152.36 -1,993 1,472 -4,582 C33 152.34 -2,351 1,373 -3,466 C32 152.30 -2,660 1,190 -3,125 C31 152.39 -2,565 767 -3,525 C29 292.16 -5,303 -1,482 -19,454 C27 148.98 -2,511 -1,023 -10,066 C26 152.36 -2,960 4,056 -5,530 C25 152.36 -1,275 4,613 -5,861 C24 152.38 -443 1,064 -5,781 C23 154.14 -1,837 652 -5,086 C22 150.56 -2,369 837 -5,491 C21 152.35 -2,163 741 -6,480 C20 304.71 -172 1,781 -12,080 C18 609.41 1,910 6,921 -20,261 C14 572.00 -688 4,318 -17,291 March 11, 2011 April 15, 2020 May 7, 2020

Vedder River Sedimentation Zones 13 March 11, 2011 May 7, 2020

Vedder Canal XS C25 Keith Wilson Bar 14 12 10 8 Elevation (m) 6 Ground - 2016 Ground - 2018 Ground - 2020 4 2 0 -200 -180 -160 -140 -120 -100 -80 -60 -40 -20 0 Station (m) April 11, 2016 April 15, 2020 May 7, 2020

Vedder River Lower Reach - XS 13 15 10 9 8 Elevation (m) 7 Ground - 2016 Ground - 2018 Ground - 2020 6 5 4 -200 -180 -160 -140 -120 -100 -80 -60 -40 -20 0 Station (m) April 11, 2016 April 15, 2020 May 7, 2020

Thalweg Profile – Vedder Canal 16 14 1991 Thalweg 2016 Thalweg 2018 Thalweg 2020 Thalweg 12 10 8 Keith Wilson Bridge Elevation (m) HW1Bridge 6 4 2 0 Vedcan7 Vedcan8 Vedcan9 Vedcan10 Vedcan14 Vedcan18 Vedcan20 Vedcan21 Vedcan22 Vedcan23 Vedcan24 Vedcan25 Vedcan26 Vedcan27 Vedcan27-1 Vedcan29 Vedcan31 Vedcan32 Vedcan33 Vedcan34 Vedcan35 Vedcan36 Vedcan37 -2 April 11, 2016 May 7, 2020

Thalweg Profile – Vedder River Lower Reach 17 14 1996 Thalweg 2016 Thalweg 2018 Thalweg 2020 Thalweg 12 10 Elevation (m) 8 6 4 2 0 Ved01 Ved02 Ved03 Ved04 Ved05 Ved06 Ved07 Ved08 Ved09 Ved10 Ved11 Ved12 Ved13 Ved14 Ved15 Ved16 Ved51 Ved17-1 April 11, 2016 April 15, 2020 May 7, 2020

Thalweg Profile – Vedder River Middle Reach 18 16 1996 Thalweg 2016 Thalweg 2018 Thalweg 2020 Thalweg 14 12 Elevation (m) 10 8 6 4 2 Ved17-2 Ved50 Ved18 Ved19 Ved20 Ved21 Ved22 Ved23 Ved23-1 Ved24 Ved25 Ved26 Ved27 Ved28 Ved29 Ved30 Ved31 Ved32 Ved33 Ved34 Ved35 April 11, 2016 April 15, 2020 May 7, 2020

Thalweg Profile – Vedder River Upper Reach 19 28 1996 Thalweg 2016 Thalweg 2018 Thalweg 2020 Thalweg 26 24 22 20 Elevation (m) 18 16 14 12 10 8 Ved36 Ved37 Ved38 Ved39 Ved40 Ved41 Ved42 Ved43 Ved44 Ved45 Ved46 April 11, 2016 April 15, 2020 May 7, 2020

Flood Profile 2018 vs. 2020 20 Mean Water Level Mean Water Level Location Change 2020-2018 Change 2020-2016 Vedder +0.16 m +0.12 Canal Vedder -0.003 m -0.04 River 2018 Ground 2020 Ground Vedder Canal Vedder River April 11, 2016 April 15, 2020 May 7, 2020

Vedder Canal Dike Freeboard Assessment 21 13.0 12.0 Keith Wilson Rd HWY 1 Bridge 11.0 10.0 0.70 m 2.90 m 9.0 Water Level (m) 8.0 7.0 6.0 Left Dike Right Dike 2018 Flood Level 2020 Flood Level 5.0 4.0 VedCan10 VedCan14 VedCan18 VedCan20 VedCan21 VedCan22 VedCan23 VedCan24 VedCan25 VedCan26 VedCan27 VedCan27.1 VedCan29 VedCan31 VedCan32 VedCan33 VedCan34 VedCan35 VedCan36 VedCan37 April 11, 2016 April 15, 2020 May 7, 2020

Vedder River Dike Freeboard 22 13.5 13 12.5 12 11.5 Elevation (m) 11 0.40 m 10.5 10 Freeboard Deficient Area 9.5 9 Left Dike Right Dike 2018 Flood Level 2020 Flood Level 8.5 8 Ved1 Ved2 Ved3 Ved4 Ved5 Ved6 Ved7 Ved8 Ved9 Ved10 Ved11 Ved12 Ved13 Ved14 Ved15 Ved16 Ved51 April 11, 2016 April 15, 2020 May 7, 2020