nice pics once again,
awesome beach, nice spillway engineering....i would be inclinced to place rip rap protection around intake, would help to minimize any erosion and protect exposed portion of pipe.
not knowing really anything about precip, watershed, and max flows in your area, that "little" pipe would be overwhelmed in my canyon. our max flows come close to filling a 20 ft wide , 4 ft high concrete spillway.
looks like you'll have a nice calm water body year round, as opposed to our violent water catching puddle. if i put a beach in it wouldnt survive past one storm.
