The principal flowpath for a 210-acre watershed is a 5,300-ft stream with a base width of 10 ft, side stops of 3:1 (h:v), and a depth of 1.4 ft at bankfull flow. The stream is an unlined open channel, earth, uniform section, with short grass. The elevations of the upper and lower sections of the stream are 258 ft and 146 ft, respectively. Estimate the time of concentration.
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