asce oc ewri - gobernadora basin facility planning design

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  1. 1. Presentation Topics Outline SMWD Alternative Water Supplies Background /Objectives / Funding Watershed Planning / Constraints Design and Hydraulic Operation Basin Design Features Basin Construction
  2. 2. SMWD Water Supplies / Alternative Sources
  3. 3. Santa Margarita Water District SMWD Service Area 50th Anniversary Provides Water and Wastewater Service to over 155,000 residents Over Next 20-30 years ~40,000 More Residents
  4. 4. Indoor Use 13,400 AF (February low flows) 27,000 AF Potable Water Outdoor Use 13,600 AF Wastewater Chiquita, 6.4 MGD, 7,200 AF Oso Creek, 2.0 MGD, 2,200 AF SOCWA, 2.2 MGD, 2,500 AF Ocean Outfall 6,300 AFRecycled Water 5,600 AF Chiquita, 3,800 AF Oso Creek, 1,800 AF Urban Return Flows 1,800 AF Oso Barrier, 1,120 AF Horno Basin, 180 AF Trabuco, 300 AF Dove Canyon, 200 AF Future: Gobernadora SMWD 2014 Water Supply
  5. 5. Districts Existing RW System ~ 2,740 Dedicated Irrigation Meters ~ 1,260 Non-Domestic Future ~ 3,000 Non-Dom
  6. 6. Coto de Caza Non-Domestic System Currently Usage ~ 1,370 afy Purchase 1,210 afy MWD water 160 afy well water
  7. 7. SMWD Proactively Seeks Multiple Types of Non-Potable Sources 8 Reclaimed Water Oso Creek WRP (2.0 MGD) Chiquita WRP (5 MGD) SOCWA, IRWD, TCWD Urban Runoff Capture Oso Creek Barrier Project Dove Canyon Basin Horno Basin Imported Water (Portola Reservoir) Non-Domestic Irrigation Water Sources Imported Water Urban Runoff Capture Recycled Water
  8. 8. SMWD Leader in Sourcing Dry Weather Nuisance Flow for Recycled Water 9 Oso Creek Barrier Project Constructed 1970s Modified 2008
  9. 9. Oso Creek Barrier Diversion Operated Successfully for > 35 Years 10 2 Million Gallons Per Day Mixes w/ Oso Creek WRP Effluent Pumped to Upper Oso Reservoir
  10. 10. Facility Planning Background and Objectives
  11. 11. Gobernadora Detention Basin Location
  12. 12. Basin Location Aerial Image (2006) Coastal Sage Gobernadora Environmental Restoration Area Coto de Caza Design Constraints Groundwater Biological Habitat Available R/W Floodplain Topography Natural alluvial Creek
  13. 13. Basin Provides Multiple Objectives / Benefits Groundwater Recovery Stormwater Treatment Flood Peak Attenuation Stream Stabilization Groundwater Infiltration
  14. 14. Project Background and Objectives Districts Goals Capture Urban Runoff Protect Downstream Facilities 10 and 16 sewer force main 36 Regional Water Transmission Main RMV/OC Public Works Storm water management Protect downstream GERA OC Parks Connect two Regional Wilderness Parks
  15. 15. Multiple Benefits for Multiple Partners Improved/Leverage Funding Opportunities Reuse Urban Runoff up to 800 afy Possible Forebay for additional xfer of RW for addl 400 afy Reduce Impacts of Storm Events Stream Stabilization Improved OC Parks Trail System Gobernadora Multi-Purpose Basin Non-Domestic Water Supply
  16. 16. Cost and Funding Sources 17 Total Project Cost $23.4 M RMV Land Transfer Value ($2.0M) RMV Cash Contributions ($9.8 M) SMWD General Fund Contributions ($0.2 M) SMWD CFD ($3.2 M) OC Parks Cash Contribution ($0.7 M) Prop. 50 Funds ($2.5 M) Prop 1E Funds ($5.0 M)
  17. 17. Regional Watershed Planning
  18. 18. Regional Watershed Analyses San Juan Creek = 176 sq. miles RMV SJC Watershed = 20.85 sq. mi. SJC U/S RMV = 79 sq. mi. SJC D/S RMV = 106 sq. mi.
  19. 19. RMV Ranch Plan Development
  20. 20. Highlights of Stormwater Facilities 32 miles storm drain pipe 21 storm drain outfalls to creeks (27 total reserved 6 future use) 22 detention basins 8 regional Local Detention Basin areas = 87.8 acres Regional Detention Basin = 87.8 acres WQ Basin areas = 46.8 acres HM Basin areas = 88.2 acres
  21. 21. Facility Planning Existing Conditions & Constraints
  22. 22. Hydrology Tributary Watershed Characteristics Gobernadora Watershed = 3,797 acres Wagon Wheel Watershed = 1,128 acres
  23. 23. Site Field Characteristics
  24. 24. Site Field Characteristics
  25. 25. Existing Creek 100-Year Floodplain
  26. 26. Gobernadora Creek Experienced Significant Erosion and Sedimentation Issues Constant amount of urban dry weather flows Erosion of the proposed basin area with 3 acres loss of land Sedimentation downstream March 2005 prevent this from happening Source: Balance Hydrologics, Inc., 2006
  27. 27. Creek Erosion Between Preliminary to Final Design Preliminary design performed in 2008. Large storm event December 2010 Erosion between Preliminary Design reduced available footprint of basin by over 3 acres Increased environmental regulatory areas
  28. 28. High Groundwater Near Surface
  29. 29. Overview of Proposed Facility
  30. 30. Existing Site Condition Pre-project
  31. 31. Milestone No.1 Construction
  32. 32. Milestone No.2 Completed Basin
  33. 33. Division of Basins
  34. 34. Peak Flood Attenuation From Upper (35 AF) and Lower (100 AF) Basins
  35. 35. Basin Embankment Section Length DSOD Jurisdiction Storage Volume Embankment Height Variation Embankment Height from Spillway Upper Basin 1,400 feet No 34 AF 10-15 feet 7.4 feet (wall) Intermediate / Separation Berm 900 feet No N/A 12 feet 4.3 feet Lower Basin 1,440 feet No 2(49 AF) 15-16 feet 12 feet
  36. 36. Primary Spillway Hydraulics / Dissipator Trapezoidal broad crest weir Tumbling flow element dissipator Designed for intercepted Q1500-year = 3,400 cfs Maximum flow depth y1500-year = 3.2 feet
  37. 37. Facility Operation Dry Weather / Flood Flows
  38. 38. Milestone No.2 Completed Basin
  39. 39. Inflatable Dams Upper Basin Inflatable Dams Flood Flow Conditions Inflatable Dams Dry Weather Diversion
  40. 40. Lateral Channel Side-Weir Hydraulic Performance Weir Length = 200 feet Sharp Crest Weir Height above channel = 7.4 feet Crest to top channel = 6.3 feet Downstream Rubber Dam = 6 feet
  41. 41. Side Weir Hydraulics Spatially Varied Flow Analysis Storm Event Hydraulic method Lag (hr) Runoff (ac- ft) Peak Flow (cfs) Bypass (cfs) Channel To Basin (cfs) 2-yr EV 1.279 118.0 387 387 0 5-yr EV BAS 1.067 217.9 803 803 0 10-yr EV BAS 0.938 432.2 1848 1575 273 25-yr EV BAS 0.856 732.6 2695 2043 652 50-yr EV BAS 0.821 873.2 3159 2269 890 100-yr EV BAS 0.795 991.6 3630 2500 1130 100-yr HC (AMCIII) BAS 0.73 1796.3 5329 3320 2009 100-yr HC (AMCIII) with Sediment HEC-RAS 0.73 1796.3 5329 2807 2522 1000-yr HC (AMCIII) BAS 0.73 2637.5 7665 4405 3260 1500-yr HC (AMCIII) BAS 0.73 2784.6 8057 4585 3472
  42. 42. Normal Dry Weather Conditions Water Reuse Functions Upper Basin Water Quality Treatment & Recharge 12 3 4 Dry weather diversion gated culvert Return Water Flow for habitat SMWD Pump Station UPPER BASIN LOWER BASIN Force Main
  43. 43. Dry Weather Flow Diversion Operation
  44. 44. Two 80 Deep Recovery Wells that Lift to Distribution Pumps Suction 50 Groundwater Wells
  45. 45. Pumping Facility Embedded into Side of Upper Basin to Draw Flows 51 Upstairs Electrical Control Room Isolation Valves from Basin (storm flows and maintenance Access Hatches to Wet and Dry Wells
  46. 46. Water Reclamation Pump Station Designed w/ Four Different Sections 1 2 3 4 Basin Inflow Creek Habitat Return Flow Qmin= 0.3 cfs Force main to Reservoir
  47. 47. Pumping Facility has Desilting, Straining, and Return Flow to Creek 53 Pump Station Features: 2 Blowers Rubber Dams 2- 100 hsp pumps (500 gpm each 550 ft head) VFD Hydroneumatic tank for force main PLC and Manual Controls SCADA radio control
  48. 48. Flood Flow Operations Channel Side Weir Upper to Lower Basin Spillways Outlet Spillways to Channel Gravity Outlet LOWER BASIN = Flood Control Lower Dam Inflated Upper Dam Deflated Gravity Outlet
  49. 49. Flood Flow Operations Specialty Features Lower Dam Inflated Upper Dam Deflated Portable Generator Connection Manual Dam Control Stream Gauge Sensor 1 Stream Gauge Sensor 2
  50. 50. Flood Control Operation
  51. 51. Flood Control Operation Lower Dam Inflated Intercept Q=2,000 cfs out of the Q100 = 5,330 cfs D/S Flood Control Rubber Dam height = 6 ft Hydraulic control for side weir operation Stilling well at rubber dam with water level transducer Height of Side Weir = 7.4 ft Total Project Flood Storage = 99 (D/S) + 34 (U/S) = 133 AF
  52. 52. Project Design Features Construction Pump Station
  53. 53. Pump Station Structure Foundation
  54. 54. Pump Station Structure Initial Construction Item
  55. 55. Pump Station & Creek Return Pipe
  56. 56. Pump Station Constructed
  57. 57. Pump Station Dry Well
  58. 58. Pump Station Dry Well
  59. 59. Pump Station Construction 65
  60. 60. Project Design Features Construction Rubber Dams
  61. 61. North Dam Foundation
  62. 62. Inflatable Dam Installation Process 73
  63. 63. Inflatable Dams Installed
  64. 64. Project Design Features Construction Side Weir
  65. 65. Channel Side Weir - Installed
  66. 66. Project Design Features Construction Basin / Embankment
  67. 67. Perimeter Embankment Section
  68. 68. Embankment Stability Analysis
  69. 69. Primary Outlet Spillway to Channel
  70. 70. Two Separate Gated Low Level Outlet
  71. 71. Low-Level Outlet Lower Basin
  72. 72. Temporary Creek Relocation Water Control
  73. 73. Extensive Groundwater Dewatering Operation
  74. 74. Revetment Installation
  75. 75. Project Design Features Construction Primary Spillway
  76. 76. Summary - Unique Multipurpose Water Resources Facility Automated operation for dry / flow floods Multiple benefits beyond flood and w

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