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Conveyance Structure

Conveyance Structure. San Gabriel River. Proposed Conveyance Structure Outlet. Proposed Conveyance Structure Inlet. 2D Cross-Section. Basin 1. Basin 2. Canal Gates. 2D Cross-Section. Water Table Elev. 157 ft. Bottom Excavation Elev. 144 Ft. Access Bridge. Mines Avenue Levee.

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Conveyance Structure

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  1. Conveyance Structure

  2. San Gabriel River Proposed Conveyance Structure Outlet Proposed Conveyance Structure Inlet 2D Cross-Section Basin 1 Basin 2 Canal Gates

  3. 2D Cross-Section Water Table Elev. 157 ft BottomExcavation Elev. 144 Ft.

  4. Access Bridge Mines Avenue Levee Automatic Gates Pipe Outlet in Basin 2 Elev. 161feet Basin 1 Concrete Pipes Concrete Inlet Structure Facing south N.T.S

  5. Foundation • Assume as a wall • Submerged in water • Used to check: • Mat Footing • Bearing soil capacity qu=5168psf • Depth Df =2 ft • Width B= 3ft NTS

  6. Concrete Inlet Structure • 2 Gates 72”x54” (Automatic Sluice Gates) • Foundation Size 15’x 2’ Wire Mesh on top • 2 Pipe Size 48” • Concrete Structure. 22.5’ • Wall Thickness 12” • Bar Grading

  7. Plan View SOUTH NORTH

  8. Excavation

  9. Hydraulic Pipe Jacking • Trenchless method • Hydraulic jacks inside the pit • The pipe is advanced forward in increments

  10. Feasibility • The siphon pipes will avoid the two existing water pipelines • Dewatering services will be needed at an elevation of 157 ft. • The minimum slope for the excavation cannot be steeper than 1 : 1

  11. The Existing Gates to be Demolished

  12. Cost Estimation • Demolition of gates • Conveyance Structure Total Cost ≈ $547,000 plus contingencies

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