Granted the obvious need to determine the useful lifetime of this or any other reservoir, it is now possible to assess the reliability of the current official estimate for Lake Nasser. Enough information of this type has been collected since the reservoir's formation in 1964 to permit a realistic assessment of its life span.
One of the chief constraints to development of a reliable estimate the Lake Nasser's case has been lack of sufficient historical data on which to construct a useful data base. Such a broad range of values is typical of sedimentation studies performed for areas that lack an adequate historic data base. The wide range of differing values is a function of many variables, including computation method, input data, and theoretical assumptions underlying the mathematical approach taken. Published estimates range from as little as 20 years (Sterling 1970) to over 1500 years (Makary 1982). Race director Gary "Lazarus Lake" Cantrell has commended Robbins in a social media post but says the Canadian runner's finish would not have counted because Robbins diverted from the race course.A number of estimates of the potential life span of Lake Nasser located in Egypt and Sudan have been made in the past several years. The cost to apply is US$1.60, and successful applicants must pay an entry fee that ranges from providing a licence plate from their home state or country, to a pack of cigarettes, depending on whether they've participated previously. The Barkley Marathons are made up of five 32-kilometre loops through Frozen Head State Park in central Tennessee and are described as one of the most difficult foot races in the world.īetween 35 and 40 runners are allowed to participate each year, and more than a thousand have attempted to complete the event since its inception in 1986. Gary Robbins says in a blog post chronicling his second attempt at finishing the infamous Barkley Marathons that he took a wrong turn in thick fog about three kilometres from the finish line, which put him just over the 60-hour cut-off time. VANCOUVER - A North Vancouver man says he is haunted by a last-minute mistake that put him six seconds short of becoming the 16th person in history to finish a gruelling 160-kilometre ultra-marathon.
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