Discuyss the below:
Q: Data by A. T. Lenz for water at 20°C show a significant increase of discharge coefficient of V-notch weirsat low heads, for a = 20°, some measured values are as follows:
H,ft: 0.2 0.4 0.6 0.8 1.0
Cd: 0.049 0.470 0.461 0.456 0.452
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