Winnick Drain Revisted: Flamingo Wash at the Imperial Palace

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Presentation before the Fall Nevada APWA conference in Lake Tahoe, Northern Nevada chapter, 2003

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Winnick Drain Revisted: Flamingo Wash at the Imperial Palace

  1. 1. Winnick Drain Revisited: Flamingo Wash at the Imperial Palace by Douglas B. Blatchford, PE
  2. 2. Overview <ul><li>“Revisited” again since 1994 </li></ul><ul><li>Complex project driven by Las Vegas Monorail </li></ul><ul><li>Involved under-grounding the Flamingo Wash at the Imperial Palace </li></ul>
  3. 3. Background <ul><li>Flamingo Wash flows across the Las Vegas Valley from west to east </li></ul><ul><li>Crosses Las Vegas Strip at the Imperial Palace </li></ul><ul><li>Day-lights ( not! ) in the casino’s parking garage </li></ul><ul><li>Major storm flows pass through the parking garage and onto Winnick Avenue </li></ul>
  4. 10. Existing Conditions <ul><li>Flamingo Wash day-lights under casino parking garage </li></ul><ul><li>4000 cfs drains east to Winnick </li></ul><ul><li>2500 cfs intercepted by a hydraulic weir </li></ul><ul><li>Winnick carries remainder as surface flow </li></ul>
  5. 12. Design objective <ul><li>Owner desired to underground system </li></ul><ul><li>Involved phased construction: </li></ul><ul><ul><li>Phase I involved placement of 2 –11’ x 7’ RCB’s </li></ul></ul><ul><ul><li>Phase II involved construction of system in parking garage, demolition of weir </li></ul></ul><ul><li>Phase II not feasible </li></ul>
  6. 13. Phase I Design <ul><li>Placement of 2- 11’ x 7’ RCB’s </li></ul><ul><li>Complex utility relocations </li></ul><ul><li>Column supporting Imperial Palace Station placed on weir </li></ul><ul><li>Critical path for permitting </li></ul>
  7. 14. Phase I Design <ul><li>Placement of 2- 11’ x 7’ RCB’s necessary because: </li></ul><ul><ul><li>Existing downstream capacity limited to 2-11’ x 7’ RCB’s </li></ul></ul><ul><ul><li>IP Station prevented future construction </li></ul></ul><ul><li>Placement of column within ramp or on weir not permitted at first </li></ul>
  8. 15. Phase I Design <ul><li>Utilities complex: </li></ul><ul><ul><li>6” water line, 4” gas relocated </li></ul></ul><ul><ul><li>Water vault protected-in-place </li></ul></ul><ul><ul><li>48” storm drain tie-in </li></ul></ul><ul><ul><li>8”, 18” and 24” sewer lines relocated </li></ul></ul><ul><ul><li>Overhead power under grounded to conduit below 2-11’x7’ box culverts </li></ul></ul>
  9. 16. Imperial Palace Winnick Avenue Winnick Drain Alley Weir Grate
  10. 20. Phase I Design – Column Placement <ul><li>Required close coordination with Clark County </li></ul><ul><li>Only one location to support straddle bent for IP Station: on the weir </li></ul><ul><li>County allowed for reconstruction of barrier rail </li></ul><ul><li>Cross-sectional area remained the same </li></ul>
  11. 23. Phase II Design <ul><li>Underground the system in the IP Parking garage </li></ul><ul><li>Demolition of the weir and intake </li></ul><ul><li>Tie-in to Phase I 2-11’ x 7’ RCB’s </li></ul><ul><li>Parking garage construction not feasible </li></ul>
  12. 24. Phase II Design <ul><li>Footings for IP parking garage columns set on shallow caliche </li></ul><ul><li>Footings close together, columns support casino </li></ul><ul><li>Underground utilities such as sewer and water in parking garage </li></ul>
  13. 25. Phase II Design <ul><li>Grate type intake not feasible given large flows and clogging </li></ul><ul><li>Downstream limited to 2500 cfs </li></ul><ul><li>Could raise the parking garage floor for traffic, allow storm flows to exit as is </li></ul><ul><li>Probably solved if/when casino is taken down </li></ul>
  14. 30. <ul><li>T-t-that’s all folks! </li></ul>

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