The 'ogee spillway' shape is designed to match:
Choose the correct answer
Shape of the reservoir catchment
Underside of the nappe from a sharp-crested weir at design head — Cd ≈ 0.7; negative pressures if exceeded
Parabolic shape for maximum discharge
The upstream dam face shape
Correct Answer
B. Underside of the nappe from a sharp-crested weir at design head — Cd ≈ 0.7; negative pressures if exceeded
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Ogee spillway: curved profile matching the lower nappe (underside of free jet) from a sharp-crested weir at design head Hd. At design head: no contact pressure between nappe and spillway face (Cd ≈ 0.7). Below design head: positive pressure (nappe presses on face). Above design head: negative pressure (suction — risk of cavitation). WES (Waterways Experiment Station) profile: standard design curves.
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