Winnick Drain Revisted: Flamingo Wash at the Imperial Palace
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The document summarizes the design challenges of undergrounding the Flamingo Wash drainage system beneath the Imperial Palace casino parking garage in Las Vegas. It describes the existing open channel system and two phase design plan to replace it with buried box culverts. Phase I involved installing two 11'x7' box culverts but Phase II to fully underground the system in the parking garage was not feasible due to structural constraints. The project aimed to allow for a monorail column placement while maintaining floodwater capacity but uncovered complex utility relocations and construction limitations.
Winnick Drain Revisted: Flamingo Wash at the Imperial Palace
- 1. Winnick Drain Revisited: Flamingo Wash at the Imperial Palace by Douglas B. Blatchford, PE
- 2. Overview Revisited again since 1994 Complex project driven by Las Vegas Monorail Involved under-grounding the Flamingo Wash at the Imperial Palace
- 3. Background Flamingo Wash flows across the Las Vegas Valley from west to east Crosses Las Vegas Strip at the Imperial Palace Day-lights ( not! ) in the casinos parking garage Major storm flows pass through the parking garage and onto Winnick Avenue
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- 10. Existing Conditions Flamingo Wash day-lights under casino parking garage 4000 cfs drains east to Winnick 2500 cfs intercepted by a hydraulic weir Winnick carries remainder as surface flow
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- 12. Design objective Owner desired to underground system Involved phased construction: Phase I involved placement of 2 11 x 7 RCBs Phase II involved construction of system in parking garage, demolition of weir Phase II not feasible
- 13. Phase I Design Placement of 2- 11 x 7 RCBs Complex utility relocations Column supporting Imperial Palace Station placed on weir Critical path for permitting
- 14. Phase I Design Placement of 2- 11 x 7 RCBs necessary because: Existing downstream capacity limited to 2-11 x 7 RCBs IP Station prevented future construction Placement of column within ramp or on weir not permitted at first
- 15. Phase I Design Utilities complex: 6 water line, 4 gas relocated Water vault protected-in-place 48 storm drain tie-in 8, 18 and 24 sewer lines relocated Overhead power under grounded to conduit below 2-11x7 box culverts
- 16. Imperial Palace Winnick Avenue Winnick Drain Alley Weir Grate
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- 20. Phase I Design Column Placement Required close coordination with Clark County Only one location to support straddle bent for IP Station: on the weir County allowed for reconstruction of barrier rail Cross-sectional area remained the same
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- 23. Phase II Design Underground the system in the IP Parking garage Demolition of the weir and intake Tie-in to Phase I 2-11 x 7 RCBs Parking garage construction not feasible
- 24. Phase II Design Footings for IP parking garage columns set on shallow caliche Footings close together, columns support casino Underground utilities such as sewer and water in parking garage
- 25. Phase II Design Grate type intake not feasible given large flows and clogging Downstream limited to 2500 cfs Could raise the parking garage floor for traffic, allow storm flows to exit as is Probably solved if/when casino is taken down
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