Determine the magnitude of the contraction scour depth given the following information about the channel and bridge: (a) the upstream channel width = 322-ft; depth = 8.6-ft (b) q = 27,300 ft3 /sec (c) channel slope = 0.004-ft/ft (c) bridge abutments consist of vertical walls with wingwalls, width = 122-ft; with three sets of piers consisting of 3 columns 15-inches in diameter (e) the bed material size: the d50 = 0.0023-ft with a fall velocity = 0.33-ft/sec (f) original depth at bridge is estimated as 7.1-ft