online_vee_notch2:   Calculation of discharge through a partially contracted 90° V-notch weir Formula: Q = 4.28 Ce (H + 0.0029)5/2          [in U.S. Units] Head H on the weir, in m [or ft] Width B of the channel, in m [or ft] Height P to the weir crotch, in m [or ft] Ce is a function of H/P and P/B Discharge Q  in L/s [or cfs] For a partially contracted 90° V-notch weir:   H/B ≤ 0.4 Fully contracted 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/onlineveenotch2.php on line 359 [ H > 0 ] Width B :         Warning: Undefined variable $headunits in /var/www/html/ponce/onlineveenotch2.php on line 366 [ B > 0 ] Height P :         Warning: Undefined variable $headunits in /var/www/html/ponce/onlineveenotch2.php on line 373 [ P > 0 ] OUTPUT: Warning: Undefined variable $ratiohtob in /var/www/html/ponce/onlineveenotch2.php on line 383 Warning: Undefined variable $ratiohtob in /var/www/html/ponce/onlineveenotch2.php on line 385 Deprecated: round(): Passing null to parameter #1 ($num) of type int|float is deprecated in /var/www/html/ponce/onlineveenotch2.php on line 385 Warning:  Ratio H/B = 0 < 0.2. Weir is fully contracted. Warning: Undefined variable $htoplocal in /var/www/html/ponce/onlineveenotch2.php on line 397 Warning: Undefined variable $ptoblocal in /var/www/html/ponce/onlineveenotch2.php on line 402 Discharge  Q :   Warning: Undefined variable $discharge in /var/www/html/ponce/onlineveenotch2.php on line 412 Deprecated: round(): Passing null to parameter #1 ($num) of type int|float is deprecated in /var/www/html/ponce/onlineveenotch2.php on line 412 0   Warning: Undefined variable $dischargeunits in /var/www/html/ponce/onlineveenotch2.php on line 412   Your request was processed at  04:21:46 am on April 3rd, 2025   [ 250403  04:21:46 ]. Thank you for running   online_vee_notch2   Please call again.   [131111]