Scrapheap Challenge - Season 4 - Eps 5: White Water Rider
The challenge is to build a powered craft to negotiate a stretch of white-water river. The craft must be powerful enough to get up the rapids but also have enough manoeuvrability to avoid treacherous rocks and to make a U-turn at the top of the course. Whoever sets the fastest single time in the course of three heats is the winner.
About Scrapheap Challenge

Title: Scrapheap Challenge
First Air Date: 1998-04-12
Last Air Date: 2010-06-27
Status: Ended
Rating: 6.1/10 (from 19 votes)
Language: EN
Seasons: 13
Total Episodes: 165
Network: Channel 4
Genres: Reality, Action & Adventure
Production Companies: Unknown
Synopsis
Scrapheap Challenge is an engineering game show produced by RDF Media and broadcast on Channel 4 in the United Kingdom. In the show, teams of contestants had 10 hours in which to build a working machine that could do a specific task, using materials available in a scrapheap. The format was exported to the United States, where it was known as Junkyard Wars. The US show was also produced by RDF Media, and was originally shown on The Learning Channel. Repeats have aired on another Discovery network, the Science Channel.
Cast

Robert Llewellyn

Lisa Rogers

Dick Strawbridge