The V-shaped weir is called as V-Notch or triangular weir. The flow rate is defined as the amount of fluid that passes through a channel per unit time. This page shows you the triangular weir formula which is a simple formula that helps you to determine the flow rate of a v-shaped weir. Just substitute the height of the weir in the V-Notch weir flow formula and do the demanding operations to get the flow rate. Be conscious about the unit of input you use in the formula.
The above Triangular weir formula in this page uses the multiplication factor of 2.49 to determine the flow rate using height measurement in simple.