Prague-Troja Canoeing Centre

The Prague Canoeing Centre is one of the most frequently used venues for international canoe slalom competition. Built in 1983 in Czechoslovakia, it diverts water around a 3.6 metres (12 ft) dam at Troja on the Vltava river in Prague. Its two unique features are its use of car and truck tires as flow diverters and its shallow slope, closer to 1% than the usual nearly 2% for such venues.[1] Despite these characteristics, the Troja facility has hosted ten World Cup races and one World Championship in the 21 years 1992–2012, and the 2013 World Championships.[2]

Prague-Troja Canoeing Center
Slalomový kanál v Praze-Troji
Prague-Troja logo.png
About
LocalePrague-Troja, Czech Republic
Main shapeLinear
AdjustableSome recent use of moveable RapidBlocs
Water sourceVltava River
PumpedNo
Flow diversionYes
Practice poolYes
Surf waveYes
GrandstandsInstalled for events
Canoe liftNo
FacilitiesYes
Opening date1983
Stats
LengthCompetition: 300 metres (984 ft) Total: 410 metres (1,345 ft)
Width12 metres (39 ft)
Drop3.6 metres (12 ft)
SlopeCompetition: 1.2% (63 ft/mi)
Flowrate16 m3/s (570 cu ft/s)
Prague Canoeing Center Slalom Course in Prague-Troja
The mid-course bridge and below. For competitions, the sloped right bank is covered with bleachers.
Foreground, the iconic truck tire water diverters. Background, the Troja dam on the Vltava river.

VenueEdit

The channel walls are vertical, with flow diverters constructed of automobile and truck tires stacked side by side to form large cylinders attached to the bottom by beams running through the tires. Large truck tires are used at the channel sides, where they often breach the surface. In the center of the flow are smaller automobile tires which remain submerged, and shallow-sloped ramps. In several spots, new concrete platforms have been installed in the channel bed to receive moveable RapidBlocs, like the ones at the Lee Valley White Water Centre used for the London 2012 Summer Olympics.[3]

 
The original water diverters, made from vehicle tires filled with concrete, have been completely replaced by adjustable plastic RapidBlocs.
 
These new plastic wave-shapers, just above the mid-course bridge, use RapidBlocs to create a standing wave for freestyle surfing tricks.

There are four wing dams on the right and five on the left. At the location of the mid-course bridge, two wing dams are directly across from each other, narrowing the channel by one third. Just below the bridge is a concrete boulder in the channel center, connected to the right bank by a barrier that blocks all flow to the right, effectively narrowing the channel by half.

2013 World Championship gatesEdit

 
Gate map for Semi- & Finals of the 2013 World Championship race, September 13. Three single-pole gates, each marked with a green dot, and no flush gates. Gate 12 was double width.
 
Gate map for Heats of the 2013 World Championship race, September 12. Five single-pole gates, each marked with a green dot, and no flush gates.

2012 World Cup gatesEdit

 
Gate map for Semi- & Finals of the 2012 World Cup races on August 25 & 26. The double-pole gates were: 1, 2, 16, 18, & 22. Gates 14 & 20 were reverse gates.

ReferencesEdit

  1. ^ "2012 ICF Canoe Slalom World Cup 4 - Pre Worlds - Prague 2012". www.slalomtroja.cz. Archived from the original on 2012-08-29. Retrieved 2013-01-31.
  2. ^ "Troja Hosts Canoe Slalom World Cup". Portal of Prague. 2010-05-19. Retrieved 2013-01-31.
  3. ^ Robertson, Paul (2011-11-18). "New Rapids in Prague". Palm - Gear for Paddlers. Retrieved 2006-08-23.

Coordinates: 50°06′47″N 14°25′30″E / 50.113°N 14.425°E / 50.113; 14.425