Online WES spillway design Formula: Q = 4.28 Ce tan (θ/2) (H + k)5/2          [in U.S. Units] Head H on the weir, in m [or ft] Width B of the channel, in m [or ft] Side width b, in m [or ft] Angle θ  in radians Ce and k are function only of θ (in degrees) Discharge Q  in L/s [or cfs] For a fully contracted V-notch weir:  H/B ≤ 0.2 Partially contracted 90° V-notch weir calculator See USBR Manual for general methodology INPUT DATA:       [Description] Select Units:      SI (metric) U.S. Customary Head H :         [ H > 0 ] Width B :         [ B > 0 ] Width b :         [ b > 0 ] Angle θ (degrees) :        [ θ > 0 ] OUTPUT: Warning:  Ratio b/H = 0 < 2. Ratio H/B = 0 ≤ 0.2.  Weir is fully contracted. Discharge  Q :   0     Your request was processed at  03:14:43 am on September 22nd, 2019   [ 190922  03:14:43 ]. Thank you for running   online_vee_notch1   Please call again.   [190905 11:31]