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length of notch formula. A notch is an opening in the side of a measuring tank or reservoir extending above the free surface. Elementary theory of Notches and Weirs.
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For a weir to be fully contracted B-b must be greater than 4h max where h max is the maximum expected head on the weir USBR 1997. By using a basic geometric formula measuring lines on a coordinate path becomes a relatively easy task. L Length of the rectangular notch or weir.
Height of the upstream water above the bottom of the weir in feet.
Sometime there is a need to correct for a weir plate cut at an incorrect angle. We have following data from above figure and these data are as mentioned here. Multiply gravity 981 ms 2 with 2 and find 12 times of it. ISO 1980 ASTM 1993 and USBR 1997 all suggest using the Kindsvater-Shen equation which is presented below from USBR 1997 for Q in cfs and heights in ft units.
