diversion tunnel

hydrological bypass. 
by-pass gallery, by-pass tunnel, diversion gallery, river diversion tunnel

OverviewRelatedGalleryDocumentsTableS1S2S3

Wikimedia, Wikidata
water pipeline, water tunnel, 

• Google Knowledge entry^@
  

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• 

  Julius Nyerere Hydropower Station
  
• 

  Tommy-Neeposh Transfer Tunnel
  

Julius Nyerere Hydropower Station – Tommy-Neeposh Transfer Tunnel – water tunnel – 

Concrete gun carriage used in placing 110 degree top-arch concrete in diversion tunnels

View showing conditions at outlet portals of Diversion tunnels Nos. 3 and 4 after diversion. Temporary backwash dike... - NARA - 293769

Bulkhead gate structure and trash rack structure at inlet portals of diversion Tunnel Nos. 4 and 3 as seen from the Nevada side. Bridge at right is temporary span from which temporary barrier will be dumped to divert river during cofferdam construction.

Cleaning invert excavation ahead of tunnel lining operations in diversion tunnel No. 2. Spoil is loaded by shovel into skip which is handed into position under gantry crane by traveling bed crane (with triangular hoist frame). Portion of the mulch is used in filling over invert concrete for truck way.

Completed concrete tunnel lining near inlet portal of diversion tunnel No. 4. Coating of moisture reserving paint is seen at top. The bands of rough-surfaced concrete seen mark the position of the gores inserted between the elements of the form to effect the construction of curves in the tunnel alignment.

Excavation and forms for tunnel plug in diversion tunnel No. 4.

Excavation and forms for tunnel plug lining in diversion tunnel No. 4. The concrete face of the upstream 6' offset from uniform tunnel section is seen in the background. Construction road will be carried across plug location on timber bridge.

High-scalers at work above inlet portal of Diversion Tunnel No. 1. Offset at right marks the upper reaches of the open cut for tunnel portal bulkhead.

Looking into Black Canyon at Nevada Diversion Tunnel intake portals from top of canyon wall on Arizona side. Trash rack structure and temporary cofferdam are seen. Fill at right is roadbed for Elev. 720 railroad construction which will pass over tunnel portals on trestle and enter tunnel at left. Note top arch concrete jumbo forms being assembled in front of portals.

Pouring invert concrete in diversion tunnel No. 3. See also previous photographs for more detailed description of methods.

Pouring side wall concrete in diversion tunnel No. 4. In this instance two forms are in use with alternate longitudinal pours being made.

Scene at outlet portal of diversion tunnel No. 2 during flash flood of August 31, 1932. Workmen are installing high pressure pumps and strengthening dikes. Note water pouring through earth and rock barrier at right.

Sidewall tunnel forms being utilized in forming bulkhead gate structure at inlet portal of Diversion Tunnel No. 1.

Side-wall concrete forms in place in diversion tunnel No. 4. See previous photographs for more complete description of construction methods.

Side-wall concrete in place in diversion tunnel No. 2.

Steel frame carriage supporting form for 110 degree top-arch concrete in diversion tunnel lining. Note jacks and wedges by means of which form is placed in position and lined up. The surface of the top concrete is painted with an asphaltic coating immediately upon removal of the form to prevent the too rapid dissipation of the concrete's moisture content. See also No. 1303 for further description.

Water breaking through earth and rock fill dike at outlet portal of diversion tunnel No. 2 during flash flood of August 31, 1932.

• Diversion of water from the Great lakes and Niagara river (IA diversionofwat00unit) (Wikimedia)

Type	Date	Description	Keywords	Notes	Source
link		Google Knowledge entry@			Wikidata
tunnel		Julius Nyerere Hydropower Station	diversion tunnel, hydroelectric power station, hydroelectric dam		Wikidata
tunnel		Tommy-Neeposh Transfer Tunnel	diversion tunnel		Wikidata
document		Diversion of water from the Great lakes and Niagara river (IA diversionofwat00unit)			Wikimedia
image		Concrete gun carriage used in placing 110 degree top-arch concrete in diversion tunnels			Wikimedia
image		View showing conditions at outlet portals of Diversion tunnels Nos. 3 and 4 after diversion. Temporary backwash dike... - NARA - 293769			Wikimedia
image		"Bulkhead%20gate%20structure%20and%20trash%20rack%20structure%20at%20inlet%20portals%20of%20diversion%20Tunnel%20Nos.%204%20and%203%20as%20seen%20from%20the...%20-%20NARA%20-%20293739.jpg Bulkhead gate structure and trash rack structure at inlet portals of diversion Tunnel Nos. 4 and 3 as seen from the Nevada side. Bridge at right is temporary span from which temporary barrier will be dumped to divert river during cofferdam construction.			Wikimedia
image		"Cleaning%20invert%20excavation%20ahead%20of%20tunnel%20lining%20operations%20in%20diversion%20tunnel%20No.%202.%20Spoil%20is%20loaded%20by%20shovel...%20-%20NARA%20-%20293677.jpg Cleaning invert excavation ahead of tunnel lining operations in diversion tunnel No. 2. Spoil is loaded by shovel into skip which is handed into position under gantry crane by traveling bed crane (with triangular hoist frame). Portion of the mulch is used in filling over invert concrete for truck way.			Wikimedia
image		"Completed%20concrete%20tunnel%20lining%20near%20inlet%20portal%20of%20diversion%20tunnel%20No.%204.%20Coating%20of%20moisture%20reserving%20paint%20is...%20-%20NARA%20-%20293692.jpg Completed concrete tunnel lining near inlet portal of diversion tunnel No. 4. Coating of moisture reserving paint is seen at top. The bands of rough-surfaced concrete seen mark the position of the gores inserted between the elements of the form to effect the construction of curves in the tunnel alignment.			Wikimedia
image		"Excavation%20and%20forms%20for%20tunnel%20plug%20in%20diversion%20tunnel%20No.%204."%20-%20NARA%20-%20293696.jpg Excavation and forms for tunnel plug in diversion tunnel No. 4.			Wikimedia
image		"Excavation%20and%20forms%20for%20tunnel%20plug%20lining%20in%20diversion%20tunnel%20No.%204.%20The%20concrete%20face%20of%20the%20upstream%206'%20offset...%20-%20NARA%20-%20293695.jpg Excavation and forms for tunnel plug lining in diversion tunnel No. 4. The concrete face of the upstream 6' offset from uniform tunnel section is seen in the background. Construction road will be carried across plug location on timber bridge.			Wikimedia
image		"High-scalers%20at%20work%20above%20inlet%20portal%20of%20Diversion%20Tunnel%20No.%201.%20Offset%20at%20right%20marks%20the%20upper%20reaches%20of%20the...%20-%20NARA%20-%20293711.jpg High-scalers at work above inlet portal of Diversion Tunnel No. 1. Offset at right marks the upper reaches of the open cut for tunnel portal bulkhead.			Wikimedia
image		"Looking%20into%20Black%20Canyon%20at%20Nevada%20Diversion%20Tunnel%20intake%20portals%20from%20top%20of%20canyon%20wall%20on%20Arizona%20side.%20Trash...%20-%20NARA%20-%20293671.jpg Looking into Black Canyon at Nevada Diversion Tunnel intake portals from top of canyon wall on Arizona side. Trash rack structure and temporary cofferdam are seen. Fill at right is roadbed for Elev. 720 railroad construction which will pass over tunnel portals on trestle and enter tunnel at left. Note top arch concrete jumbo forms being assembled in front of portals.			Wikimedia
image		"Pouring%20invert%20concrete%20in%20diversion%20tunnel%20No.%203.%20See%20also%20previous%20photographs%20for%20more%20detailed%20description%20of...%20-%20NARA%20-%20293694.jpg Pouring invert concrete in diversion tunnel No. 3. See also previous photographs for more detailed description of methods.			Wikimedia
image		"Pouring%20side%20wall%20concrete%20in%20diversion%20tunnel%20No.%204.%20In%20this%20instance%20two%20forms%20are%20in%20use%20with%20alternate...%20-%20NARA%20-%20293698.jpg Pouring side wall concrete in diversion tunnel No. 4. In this instance two forms are in use with alternate longitudinal pours being made.			Wikimedia
image		"Scene%20at%20outlet%20portal%20of%20diversion%20tunnel%20No.%202%20during%20flash%20flood%20of%20August%2031,%201932.%20Workmen%20are%20installing%20high...%20-%20NARA%20-%20293726.jpg Scene at outlet portal of diversion tunnel No. 2 during flash flood of August 31, 1932. Workmen are installing high pressure pumps and strengthening dikes. Note water pouring through earth and rock barrier at right.			Wikimedia
image		"Sidewall%20tunnel%20forms%20being%20utilized%20in%20forming%20bulkhead%20gate%20structure%20at%20inlet%20portal%20of%20Diversion%20Tunnel%20No.%201."%20-%20NARA%20-%20293738.jpg Sidewall tunnel forms being utilized in forming bulkhead gate structure at inlet portal of Diversion Tunnel No. 1.			Wikimedia
image		"Side-wall%20concrete%20forms%20in%20place%20in%20diversion%20tunnel%20No.%204.%20See%20previous%20photographs%20for%20more%20complete%20description...%20-%20NARA%20-%20293697.jpg Side-wall concrete forms in place in diversion tunnel No. 4. See previous photographs for more complete description of construction methods.			Wikimedia
image		"Side-wall%20concrete%20in%20place%20in%20diversion%20tunnel%20No.%202."%20-%20NARA%20-%20293693.jpg Side-wall concrete in place in diversion tunnel No. 2.			Wikimedia
image		"Steel%20frame%20carriage%20supporting%20form%20for%20110%20degree%20top-arch%20concrete%20in%20diversion%20tunnel%20lining.%20Note%20jacks%20and...%20-%20NARA%20-%20293690.jpg Steel frame carriage supporting form for 110 degree top-arch concrete in diversion tunnel lining. Note jacks and wedges by means of which form is placed in position and lined up. The surface of the top concrete is painted with an asphaltic coating immediately upon removal of the form to prevent the too rapid dissipation of the concrete's moisture content. See also No. 1303 for further description.			Wikimedia
image		"Water%20breaking%20through%20earth%20and%20rock%20fill%20dike%20at%20outlet%20portal%20of%20diversion%20tunnel%20No.%202%20during%20flash%20flood%20of...%20-%20NARA%20-%20293727.jpg Water breaking through earth and rock fill dike at outlet portal of diversion tunnel No. 2 during flash flood of August 31, 1932.			Wikimedia

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