1. July 11, 2011This is a self paced presentation.Click mouse or space bar to advance to next slide.

2. Key Map 3. Time Line 4:00pm 911 notifies Ute Water about water on the road at 25 Rd & I Rd 4:50pm 911 notifies GVWU of Breach 5:00pm GVWU divert water to Persigo & Indian Washes 7:00pm GVWU attempt to Shore-up Breach 7:30pm GVDD Called by GVIC 7:45pm Water is flowing over 25 & I Road 3 deep 8:00pm Canal is at full breach 8:30pm GVWU departs to shut canal down 8:45 pm TV crews at 25 & I Road 9:00pmCanal water level reduced 9:15pmGVDD and GVIC feel Situation is stable 9:30pmGVWU prepares Tunnel 3 for closure 9:30pmStorm Hits desert North of I Road and East of 27 Road 10:00m GVWU begins Tunnel 3 closure 10:30pm City Streets notified of water at 26 Rd & Catalina Dr 4. Time Line 10:30pm 911 notifies GVIC there are high waters 10:30pm Water is flowing over 25 & I Road 12 deep 11:00pm GVWUA finalizes Tunnel 3 closure 12:30am Street crews finish clean up at Catalina Dr 1:00am City crews realize Canal has continued to breach 2:00am911 notifies Road & Bridge and City Streets of excessive water 2:45am Threat to City Market fuel tanks assessed 3:00am Water flows begin to dissipate 6:ooam GVDD & GVIC employees notice extent of flooding on way to work 7:00am All agencies mobilize employees and equipment 9:00am City/521/GVDD find situation on Leach Creek & Gov Highline Canal Tuesday GVWU learn of the Perfect Storm Thursday Finish breach repair Friday Water returned to the Canal 5. 4:00pmUte Water gets a call Daryl Moorefrom 911 finds canalbeginning to breachWater on the Road! 6. Canal Breach Government Highline Canal at its beginning stages 7. Breach caused by failedculvert under the canal 8. Shortly before Houston, We have a5pmproblem911 notifies GVWU of apossible breach and instructs them to call UteWater for details 9. Between5pm & 6pmGVWU diverts water deploy employees & equipment 100+cfs diverted to Persigo Wash 80-100cfs diverted to Indian Wash Adjust check structures East of breach The Government Highline Canal was flowing 574cfs at Indian Wash Monday morningNormal flow at Indian Wash is 650cfs 10. 7:00pm GVWU Attempts to shore-up breach with Dirt Concrete Rip Rap 11. 7:30 PM GVDD gets a call for GVIC about a breach in theGovernment Highline east of 25 Road. GVDD responds by putting personnel on notice thatequipment may be needed to help with debrisremoval. GVDD Checks North Cochran Wash from 24 and HRoad to and including Leach Creek to South of theRiverside Parkway All Crossings are taking the increased flow, situationappears stable 12. 7:45pm Water overtopping 25 & I road 3 deep8:00pmGovernment Highline Canal at full breachStable and controlled with water management 13. 8:30pm GVWU adjusts check structure West of breach GVWU departs to shut canal down 14. 8:45pm TV crews are at 25 & I Road 15. 9:00pm Canal water levelreduced and Breach is fullbut situation is stable! City Parks at CanyonView aware of situation GVDD checks GVICcrossings with GVIC and,again, all crossings onNorth Cochran Wash arehandling the increasedflow 16. 9:15pm All is Well GVWU communicates to GVDD & GVIC the breach situation is controlled and GVDD & GVIC after checking downstream crossings agree to the stability of the conditions GVDD has employees stand down all is stable andassistance with repairs can begin in the morning Employees drive through a heavy rain on the way home 17. GVWU prepares9:30pm Tunnel 3 for closure Sluice the Dam of debris Lower the pond above the dam 18. A heavy rainstorm pounds the9:30pm desert along Leach Creek Northof I Road and East of 27 Road 19. Leach Creek under the Government HighlineLeach CreekCanal is partially plugged and runs down the ROW and spills into the already crippled Canal two miles upstream from the breachI Road Overview Road 20. Looking North at Leach Leach CreekCreek from GovernmentHighline Canal 21. Leach Creek spills into theGovernment Highline Canal leaving Debrislarge amounts of debris behindDebris 3x60 CMP 22. Debris left behind byoverflowing LeachCreek on the North side of the Canal 23. Leach CreekGovernment Highline Canal North bank is washed intocanal Leach Creek Damaged Northbank of Canal 24. Leach Creek Spills into the Government Highline and flowsdown stream to the stable breachSpill 25. South side afterLeach Creekstorm CanalLeach Creek 26. GVDDCleaning 27. 60 Culverts 28. 10:00pm GVWU Initializes Tunnel 3 Closure 29. 10:30pm City Crews called to26 Rd & Catalina DrCatalina Drive 30. 10:30pm 911 notifies GVIC there are high waters.GVIC doesnt realize this is a new issue, and still maintains the situation isunder control The water is now 12deep over 25 & I Road 31. 11:00pm GVWUA finalizes tunnel 3 closure 32. 12:30am City crews finish removingmud and debris at26 Rd & Catalina Dr 33. Property owner justfinished majorlandscaping on this corner Catalina Drive 34. 1:00am Street Crews realize Canal has additional watersentering the breach 35. 1:30amGVWU employees returning from dam are amazed at amount of water flowing across 24 road and the deeper water over 25 & I road.Canal road to breach was impassable due to the wet, slick, and muddy conditions in the dark 36. 2:00am 911 notifies Road & Bridge and City Streets of excessive waterAlert!!!25 Road & I Road3 deep pavement undercut833 24 Road50 exposed gas line10x150x8 washout2.5 days to repair2438 H RoadExposed telephone line1.5 days to repair 37. 24 Road50 exposed gas line10x150x8 washout2.5 days to repair 38. Flooding along 24 Road 2:00am Water overtopping G Road The West portion of the Canyon View Park parking lot was flooded Water overtopping F Road Water crossing 24 Road into 24Road Video Store parking fromthere into the parking lots of The Black Bear Diner Starbucks Holiday Inn Express C&F (Loco) Food Store Water overtopping Patterson on the East side then into Sutherlands Water was to the top of the concrete fuel pump islands at City Market 39. Water was to the top of2:45amthe concrete fuel pumpislandsThreat to City Market fuel tanks assessed 40. 3:00am Water flows begin to dissipate Water ceases to overtop G Road F Road Patterson Road 50% of 24 Rd between Patterson Rd & G Rd under water Street crews begin cleaning mud & debris from arterialstreets6:30am GVDD & GVIC made aware of the extent of flooding from employeeson their way to work 41. All agencies Deploy7:ooam All agencies deploy employees and equipment for cleanup and repair except city streets whom continued through the night with their efforts. County Road & Bridge Ute Water GVIC GVWU GVDD 521 Drainage Authority 42. 9:00amGVWU note the breach is 3 times the size City/521/GVDD findsituation on Leach Creek and Government HighlineCanal 43. Tuesday GVWU learns ofPerfect Storm GVWU learns that the heavy rainfall occurring Monday evening caused damage to the North bank of the canal as the rain runoff sheet flowed off the desert and into the canal at the area designated Spill (for the purpose of this presentation) 44. Thursday July 14 Finished breachrepair 45. Friday July 15Water back in canalNorth bank of canal at Leach Creek is repaired & rip rappedBreach repair is complete and stableArterial streets cleaned of debrisCanal check structures resetWater users had water by Saturday 16Continued cleaning South of Spill on Leach Creek untildispute with property ownerGVIC removed debris from Appleton Flume 46. Before Cleaning 47. each Creekfter Cleaning & Repair GVDD Cleaning Canal 60 CMPNorth side after cleaning & repair 48. Leach Creek South of CanalBefore Cleaning Leach Creek 49. CanalLeach CreekLeach Creek60 CMP South side aftercleaning & repair 50. Before Cleaning 51. Begin Cleaning 52. After Cleaning 53. After Cleaning 54. 27 1/4 RoadNorth of Canal 55. Canal 56. SpillGrand Vista SubSummer Hill Sub 57. MaintenanceissuesGrand Vista Sub 58. Grand Vista Sub Debris caught on flume 59. GVIC Highline FlumePossibleHazard Appleton Flume24 Road Crossing 60. GVIC Highline Flume 61. Appleton FlumeH Road24 Road Piles of woodAppleton Flume24 Road Crossing GVIC access road 62. AppletonFlumePiles of wood 63. Appleton Flume 64. 24 Road crossingNorth Cochran Wash 65. 24 RoadCity MarketF Road 66. 833 24 Road 67. Summary for GVDD Better notification Balance of resources Mapping consistency Identification of Increased Hazard Areas On going debris cleaning and flow line maintenance Natural stream maintenance & encroachment enforcement Detention in upper basins EIS on Walker Field runway