Easterly Tunnel Dewatering Pump Station

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Pump Design and Operation - Components1. Main Dewatering Pumps• 4 @ 40 MGD• 1 @ 20 MGD2. Final Dewatering Pumps• 2 @ 10 MGD3. Valves• Suction (Isolation)A. Knife Gate Valves (5 Main Dewatering Pumps)B. Plug Valves (2 Final Dewatering Pumps)• Discharge (Isolation/Flow Control)A. Hydraulically Operated Cone Valves4. Emergency Sump Pumps• 2 @ 1 MGD16
Cone Valve - ThrottlingKey Hydraulic Elevations – Tunnel and Pump StationSystemECT/DSTSTORAGE (MG)Tunnels will fill to HWLEL. 575 about 3 timesin an average yearThrottled Operation30 hours/yr @ 160 mgd[0.2 BG volume]10% of operating volumeUn-throttled Operation303 hours/yr @ 160 mgd[2 BG volume]90% of operating volumeEL 412 (7.8 MG)SHUT OFF20/40 MGDTop of Header NormallySubmerged at End ofPumping CycleINV EL 402.751717
Page 1 and 2: Presented by: Michael Ritossa, MWHA
Page 3 and 4: Project Technical Overview3
Page 5 and 6: 126 CSO Locations Throughoutthe Com
Page 7 and 8: 7The Nine Mile SiteWill Be the Nexu
Page 9 and 10: 3D Rendering From AboveECT Shaft 1E
Page 11 and 12: ETDPS Project Technical Overview1.
Page 13 and 14: ETDPS Programmed to be CompleteShor
Page 15: Pump Design and Operation - Objecti
Page 19 and 20: Separate Discharge Headers Were Pro
Page 21 and 22: Ventilation Designed to Avoid Hazar
Page 23 and 24: Consideration was Given to Ensure A
Page 25 and 26: Pump Room Looking West - Elevs. 389
Page 27 and 28: Pump Design and Operation - CFD Mod
Page 29 and 30: Main Dewatering Pump SupportsFinite
Page 31 and 32: Architectural and Pump StationSuppo
Page 33 and 34: Pump Building at Grade - Roof Remov
Page 35 and 36: Below Grade Facilities35
Page 37 and 38: Access Shafts - Looking North37
Page 39 and 40: CavernHeight68 FtPrimary Shaft Supp
Page 41 and 42: Access Shafts - Looking NorthSoil95
Page 43 and 44: Rock Bolt/Dowel Pattern - Cavern Ro
Page 45: Raw Water Tunnel45

Easterly Tunnel Dewatering Pump Station

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