An emergency spillway for a detention basin is constructed as a trapezoidal channel with bottom width of 10.0 feet and side slopes of 2 horizontal to 1 vertical and lined with grass (n   XXXXXXXXXXThe...

An emergency spillway for a detention basin is constructed as a trapezoidal channel with bottom width of 10.0 feet and side slopes of 2 horizontal to 1 vertical and lined with grass (n
 0.040). The elevation of the crest of the emergency spillway is 480.00 feet. The slope of the channel is 0.0080 ft/ft. Compute a chart showing the relationship between reservoir elevation and discharge into the channel.