If there were any questions as to the possible impact of a zip line in the Snake River Canyon they may have been answered yesterday.  Magic Valley Flight Simulation LLC has been trying to get approval to put in a zip line in the canyon since last year but so far the group has failed to win the approval of the Twin Falls Planning and Zoning Commission.  Earlier this month the commission voted not to allow the zip line.  Magic Valley Flight Simulation is appealing that decision to the City Council next month.  Yesterday the group set up a temporary zip line to show city officials what to expect if the plan was approved and to help an engineer draft a site plan..something which has been lacking in the groups presentation to get approval.  If approved the zip line would take riders from Canyon Springs Golf Course and over Centennial Waterfront Park.