The sports legacy of the Olympic cycling complex has been secured.

Games chiefs have agreed a £ 12million plan which guarantees that the velopark facilities will be used by a mix of schools, community clubs and top riders from across London and the South-East for 25 years.

In a major boost to the Evening Standard's campaign for a sports legacy from the 2012 Games, it is the first purpose-built venue to secure its future.

The £80million velopark consists of a 6,000-capacity velodrome and 6,000-capacity BMX circuit.

After the Olympics, mountain bike trails and a mile-long road circuit will be added as the new home for the Eastway Cycle Club which has been forced to relocate for the Games.

Annual running costs of £500,000 have been underwritten by the Lee Valley Regional Park Authority which owns a fifth of the land in the 500-acre Olympic Park.

Under a deal struck with cycling's national governing body, British Cycling, the velodrome will become the training base for the region's best riders while the "infield" will be used by novice riders.

Shaun Dawson, chief executive of the authority, said: "After 2012, the velopark will be the cycling hub for London and the South- East. Schoolchildren and families will be able to cycle alongside Olympics champions whether it is in BMX, mountain biking or track racing."

The deal has been agreed with the London Development Agency which will set out the business plan for the velodrome - including ownership of the facility - in its Legacy Masterplan Framework which will be published early next year. The agency has an annual budget of £18million to run a 10,000-acre park which stretches 26 miles from the Olympic zone to Hertfordshire. As the landowner, it will also be responsible for the Eton Manor site in the north of the Olympic park and the £30million white-water canoe venue in Broxbourne Showgrounds.

Eton Manor will stage paralympic archery and wheelchair tennis. After the Games the tennis courts will be retained and a hockey stadium will be built as the likely home for the national hockey federation.

The white-water canoe venue will be created with water from six wells sunk deep into the ground. A 300-metre Olympic course will be five metres from the highest to lowest point with temporary stands for 16,000 spectators. A 150-metre "legacy loop" for hobby paddlers will open in 2010.

The venue will pay its way after 2010 by offering "white knuckle" rides in six-man boats at weekends from April to October. During the week sessions will be available for elite paddlers. A clubhouse for Games officials will be turned into classrooms and a café. The venue was confirmed this year after the previous site six miles away was deemed too expensive to decontaminate.