Irrigation Engineering
The flow-mass curve is graphical representation of

Discharge and time in chronological order
Discharge and percentage probability of flow being equaled or exceeded
Cumulative discharge and time
Cumulative discharge, volume and time in chronological order

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Irrigation Engineering
Lacy's regime condition is obtained if

Silt grade in the channel is variable
Silt charge in the channel is variable
Channel flows in unlimited, incoherent alluvium of the same character as that transported material
Discharge in the channel is variable

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