LAR BPWG. DWR Erosion Screening Process Application to LAR. May 17, water resource specialists
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1 LAR BPWG DWR Erosion Screening Process Application to LAR May 17, 2016
2 Presentation Outline Review of Erosion Screening Process Modifications for LAR Application ESP LAR Results Recommendations
3 ESP Background AECOM November 17, 2015 Presentation General Purpose Caveats and Limitations Three Tiers or Steps Cross Section Based Total Erosion (Wind and Waves)
4 ESP Tier 1 Analysis Pass/Fail Analysis Soil Erodibility Levee Geometry Fetch length Historical Performance
5 ESP Tier 1 Levee Geometry
6 ESP Tier 2 Analysis Pass/Fail Analysis Applied vs Critical Velocity Applied vs Critical Shear (wind) Field Reconnaissance
7 ESP Tier 2 Example (RM 8.5R) 60 American River RM 8.5 Right levee Elevation (ft NAVD88) H:1V 2H:1V Max WSE (unsteady HEC RAS) HEC RAS cross section 20 LiDAR 15 Min levee template (Max WSE+3 ft) Station (ft)
8 ESP Tier 2 Example (RM 8.5) American River RM Max WSE (unsteady HEC RAS) WSE (RMA2 160K) Bed (HEC RAS) Elevation (ft NAVD88) Velocity (ft/s) Bed (RMA2) Vel (HEC RAS) Vel (RMA2 160K) Station (ft)
9 ESP Tier 3 Analysis Applied to Sites that fail Tiers 1 and 2 Horizontal Extent of Wind Wave Erosion Horizontal Extent of Velocity Erosion Assigns Priorities based on TE/LW
10 ESP Tier 3 Risk Categories
11 ESP LAR Modifications Separate Wind Wave/Velocity Erosion Separate Levee/Bank Toe Erosion Analyze encroachment into levee prism to assign priorities
12 ESP LAR Nomenclature
13 ESP LAR Data Requirements Levee and River Geometry 200-Year Hydrograph 200-Year Velocities Soil Types (levees/foundation) Vegetation and Riprap Protection
14 ESP LAR Geometry
15 ESP LAR 200-Year Hydrograph American River 180,000 1st Peak (160,000 cfs ) = 39 hrs 160, , ,000 RM 22 RM RM RM RM RM Flow (cfs) 100,000 80,000 2nd Peak (115,000 cfs ) = 107 hrs (total) 60,000 40,000 20, Time (hrs)
16 ESP LAR Hydraulics (RM 3.5) American River RM 3.5 Elevation (ft NAVD88) Velocity (ft/s) Max WSE (unsteady HEC RAS) WSE (RMA2 160K) Bed (HEC RAS) Bed (RMA2) Vel (HEC RAS) Vel (RMA2 160K) Station (ft)
17 ESP LAR Soils and Slope Cover Based primarily on field investigations Supplemented by borings, maps showing extent of bank protection
18 ESP LAR Tier 1 Results All sections failed soil erosion susceptibility and fetch tests All sections re-considered in Tier 2
19 ESP LAR Tier 2 Results Nearly all sites failed the wind wave erosion test All sites re-considered in Tier 3
20 ESP LAR Tier 3 Calculations Horizontal extent of erosion calculated at levee and bank toe Erosion only occurs when applied exceed critical Velocities Erodibility coefficient for soils (ft 3 /lb-hour) Difference between Applied and Critical Shear Stress Duration of the particular flow
21 ESP LAR Levee Toe Erosion Erosion (ft) Class Number of Observations to to to 20 >
22 ESP LAR Bank Toe Erosion Erosion (ft) Class Number of Observations to to to 20 >
23 ESP LAR Risk Categories Based on erosion encroaching into levee template or prism High encroaches into prism Medium close to prism Low distant from prism
24 ESP LAR Encroachment Example
25 ESP LAR Erosion Risks
26 ESP LAR High Risk Sites Main risk is erosion into prism at levee toe RM 1.75L to 2.25L RM 2.65L to 2.85L RM 3.75L to 4.25L RM 8.2L to 9.5L RM 7.0R to 8.5R
27 ESP LAR Recommendations High Risk Levee Embankment: 4 miles Lengths approximate Critical velocities an issue RM 7.0R to 8.5R: Levee erosion risk also bank erosion occurs. RM 7.0R to 8.5R: highest priority site for BPWG from ESP
28 Questions?
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