7Tullis B P, Anderson D S, Robinson S C. Entrance loss coefficients and inlet control head-discharge relationships foe buried-invert culverts [J]. Journal of Irrigation and Drainage Engineering, 2008, 134(6): 831- 839.
8Van Nam N, Archambeau P, Dewals B, et al. Local head-loss coefficient at the rectangular transition from a free-surface channel to a conduit [J]. Journal of Hydraulic Engineering, 2013, 139(12): 1318-1323.
9Gardel A. Head loss in a conical contraction [J]. Bulletin Technique de la Suisse Romande, 1962, 88(1): 313-320.
10Datta I, Denath K. Volume of fluid model of open channel contraction [J]. Journal of the Institution of Engineers (India): Series C, 2014, 95(3): 251-259.
