online_vee_notch1:   Calculation of discharge through a fully contracted V-notch weir 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 :         Warning: Undefined variable $headunits in /var/www/html/ponce/onlineveenotch1.php on line 202 [ H > 0 ] Width B :         Warning: Undefined variable $headunits in /var/www/html/ponce/onlineveenotch1.php on line 208 [ B > 0 ] Width b :         Warning: Undefined variable $headunits in /var/www/html/ponce/onlineveenotch1.php on line 214 [ b > 0 ] Angle θ (degrees) :        [ θ > 0 ] OUTPUT: Warning: Undefined variable $ratiobtoh in /var/www/html/ponce/onlineveenotch1.php on line 227 Warning: Undefined variable $ratiobtoh in /var/www/html/ponce/onlineveenotch1.php on line 229 Deprecated: round(): Passing null to parameter #1 ($num) of type int|float is deprecated in /var/www/html/ponce/onlineveenotch1.php on line 229 Warning:  Ratio b/H = 0 < 2. Warning: Undefined variable $ratiohtob in /var/www/html/ponce/onlineveenotch1.php on line 233 Warning: Undefined variable $ratiohtob in /var/www/html/ponce/onlineveenotch1.php on line 238 Warning: Undefined variable $ratiohtob in /var/www/html/ponce/onlineveenotch1.php on line 244 Deprecated: round(): Passing null to parameter #1 ($num) of type int|float is deprecated in /var/www/html/ponce/onlineveenotch1.php on line 244 Ratio H/B = 0 ≤ 0.2.  Weir is fully contracted. Discharge  Q :   Warning: Undefined variable $discharge in /var/www/html/ponce/onlineveenotch1.php on line 251 Deprecated: round(): Passing null to parameter #1 ($num) of type int|float is deprecated in /var/www/html/ponce/onlineveenotch1.php on line 251 0   Warning: Undefined variable $dischargeunits in /var/www/html/ponce/onlineveenotch1.php on line 251   Your request was processed at  10:57:18 pm on April 3rd, 2025   [ 250403  22:57:18 ]. Thank you for running   online_vee_notch1   Please call again.   [131111]