1. Free jet scour below dams and flip buckets;Mason;J. Hydraul. Eng.,1985
2. Scour Manual;Hoffmans,1997
3. Scour downstream of grade control structures;Borman;J. Hydraul. Eng.,1991
4. W. Whittaker, M. Jaggi, Blockshwellen. Mitteilungen 91, Versuchsanstalt fur Wasserbrau, Hydrologie und Glaziologie, ETH, Zurich, Switzerland. (1996).