Winnick Drain Revisted: Flamingo Wash at the Imperial Palace
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Winnick Drain Revisited:Winnick Drain Revisited:
Flamingo Wash Flamingo Wash at the Imperial Palaceat the Imperial Palace
byby
Douglas B. Blatchford, PEDouglas B. Blatchford, PE
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OverviewOverview
““Revisited” again since 1994Revisited” again since 1994Complex project driven by Las Complex project driven by Las
Vegas MonorailVegas Monorail Involved under-grounding the Involved under-grounding the
Flamingo Wash at the Imperial Flamingo Wash at the Imperial Palace Palace
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BackgroundBackground
Flamingo Wash flows across the Las Flamingo Wash flows across the Las Vegas Valley from west to eastVegas Valley from west to east
Crosses Las Vegas Strip at the Imperial Crosses Las Vegas Strip at the Imperial PalacePalace
Day-lights (Day-lights (not!not!) in the casino’s parking ) in the casino’s parking garagegarage
Major storm flows pass through the Major storm flows pass through the parking garage and onto Winnick parking garage and onto Winnick AvenueAvenue
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Existing ConditionsExisting Conditions
Flamingo Wash day-lights under Flamingo Wash day-lights under casino parking garagecasino parking garage
4000 cfs drains east to Winnick4000 cfs drains east to Winnick2500 cfs intercepted by a hydraulic 2500 cfs intercepted by a hydraulic
weirweirWinnick carries remainder as Winnick carries remainder as
surface flowsurface flow
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Design objectiveDesign objective
Owner desired to underground Owner desired to underground systemsystem
Involved phased construction:Involved phased construction:Phase I involved placement of 2 –11’ x Phase I involved placement of 2 –11’ x
7’ RCB’s7’ RCB’sPhase II involved construction of system Phase II involved construction of system
in parking garage, demolition of weirin parking garage, demolition of weirPhase II not feasiblePhase II not feasible
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Phase I DesignPhase I Design
Placement of 2- 11’ x 7’ RCB’sPlacement of 2- 11’ x 7’ RCB’sComplex utility relocationsComplex utility relocationsColumn supporting Imperial Palace Column supporting Imperial Palace
Station placed on weirStation placed on weirCritical path for permittingCritical path for permitting
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Phase I DesignPhase I Design
Placement of 2- 11’ x 7’ RCB’s Placement of 2- 11’ x 7’ RCB’s necessary because:necessary because:Existing downstream capacity limited Existing downstream capacity limited
to 2-11’ x 7’ RCB’sto 2-11’ x 7’ RCB’sIP Station prevented future IP Station prevented future
constructionconstructionPlacement of column within ramp Placement of column within ramp
or on weir not permitted at firstor on weir not permitted at first
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Phase I DesignPhase I Design
Utilities complex:Utilities complex:6” water line, 4” gas relocated6” water line, 4” gas relocatedWater vault protected-in-placeWater vault protected-in-place48” storm drain tie-in48” storm drain tie-in8”, 18” and 24” sewer lines relocated8”, 18” and 24” sewer lines relocatedOverhead power under grounded to Overhead power under grounded to
conduit below 2-11’x7’ box culvertsconduit below 2-11’x7’ box culverts
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Imperial Palace
Winnick Avenue
Winnick Drain
Alley
Weir
Grate
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Phase I Design – Column Phase I Design – Column PlacementPlacement
Required close coordination with Required close coordination with Clark CountyClark County
Only one location to support straddle Only one location to support straddle bent for IP Station: on the weirbent for IP Station: on the weir
County allowed for reconstruction of County allowed for reconstruction of barrier rail barrier rail
Cross-sectional area remained the Cross-sectional area remained the samesame
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Phase II DesignPhase II Design
Underground the system in the IP Underground the system in the IP Parking garageParking garage
Demolition of the weir and intakeDemolition of the weir and intakeTie-in to Phase I 2-11’ x 7’ RCB’s Tie-in to Phase I 2-11’ x 7’ RCB’s Parking garage construction not Parking garage construction not
feasiblefeasible
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Phase II DesignPhase II Design
Footings for IP parking garage Footings for IP parking garage columns set on shallow calichecolumns set on shallow caliche
Footings close together, columns Footings close together, columns support casinosupport casino
Underground utilities such as Underground utilities such as sewer and water in parking garagesewer and water in parking garage
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Phase II DesignPhase II Design
Grate type intake not feasible given Grate type intake not feasible given large flows and clogginglarge flows and clogging
Downstream limited to 2500 cfsDownstream limited to 2500 cfsCould raise the parking garage floor Could raise the parking garage floor
for traffic, allow storm flows to exit for traffic, allow storm flows to exit as isas is
Probably solved if/when casino is Probably solved if/when casino is taken downtaken down
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T-t-that’s all folks!T-t-that’s all folks!