_____________________ are suitable only for low spillways or weirs.
(a) Chute blocks
(b) Sloping aprons
(c) Baffle wall or friction blocks
(d) Roller buckets
I had been asked this question in an interview for internship.
Question is taken from Energy Dissipation Below Overflow Spillway topic in section Spillways, Energy Dissipators and Spillway Gates of Irrigation Engineering