The correct answer is: C. Parallel to weir crest in both
A chute spillway is a type of spillway that is designed to discharge water in a chute or channel. The flow of water in a chute spillway is parallel to the weir crest. A side channel spillway is a type of spillway that is designed to discharge water in a side channel. The flow of water in a side channel spillway is also parallel to the weir crest.
Option A is incorrect because the flow of water in a chute spillway is parallel to the weir crest, not at right angles to it. Option B is incorrect because the flow of water in a chute spillway is parallel to the weir crest, not at right angles to it. Option D is incorrect because the flow of water in a chute spillway is parallel to the weir crest, not at right angles to it.