In 2009, at the time work began on the construction of the velodrome, the estimated cost of that facility alone was £105 million. Work on the velodrome was completed in February 2011, and was the first Olympic Park venue to be completed. The roof is designed to reflect the geometry of cycling as well as being lightweight and efficient reflecting a bike. There is also a 360-degree concourse level with windows allowing people views of the Olympic Park. The velodrome is energy efficient—rooflights reduce the need for artificial lights, and natural ventilation reduces the need for air condition. Rain water is also collected, which reduces the amount of water used from the municipal water system. Designer Ron Webb, who designed the velodrome tracks for the Sydney and Athens Games, was in charge of the design and installation of the track. The 250-metre track was made with of Siberian Pine and 350,000 nails.