Classification of falls
Classification of falls

Classification of falls

CLASSIFICATION OF FALLS The falls can be classified into the following four categories according to the approach conditions. 1. Falls which maintain relation between depth and discharge. 2. Falls which maintain level of U/S water constant. 3. Combination of fall and regulator. 4. Miscellaneous falls. 1. Falls in which D-Q relationship is maintained. In such falls there is neither drawdown nor heading up of water on U/S side. The Depth-discharge relationship for the channel is maintained. Trapezoidal notch falls and low crested rectangular notch falls, fall under this category. 2. Falls which maintain fixed F.S.L. on the U/S side of the fall. Siphon fall or Siphon spillway high crested weir fall are the falls which fulfil this condition. Such falls cause silting on U/S side. Such falls are necessary under following circumstances. (i) When a sub-channel has to take off at some distance U/S of the fall. (ii) When Hydro-electricity…

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