onlinechannel15b:   Rating curve in a prismatic channel using the Manning equation Definition sketch for a prismatic channel Formulas: P = b + 2y(1 + z2)1/2 T = b + 2zy A = y(b + zy) R = A/P D = A/T Q = (C/n) AR2/3S1/2 v = Q/A F = v/(gD)1/2 INPUT DATA: Stream or river (optional):   Select:     SI units (metric) U.S. Customary units Bottom width b :       Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinechannel15b.php on line 306 Flow depth y :       Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinechannel15b.php on line 313 Side slope z1 :       Warning: Undefined variable $nounits in /var/www/html/ponce/onlinechannel15b.php on line 320 Side slope z2 :       Warning: Undefined variable $nounits in /var/www/html/ponce/onlinechannel15b.php on line 327 Manning's n :       Warning: Undefined variable $nounits in /var/www/html/ponce/onlinechannel15b.php on line 334 Bottom slope S :       Warning: Undefined variable $nounits in /var/www/html/ponce/onlinechannel15b.php on line 341 INTERMEDIATE CALCS: Units selected:    Warning: Undefined variable $unitsystemsname in /var/www/html/ponce/onlinechannel15b.php on line 360 Grav. accel. g:    Warning: Undefined variable $gravity in /var/www/html/ponce/onlinechannel15b.php on line 361 Warning: Undefined variable $accelerationunits in /var/www/html/ponce/onlinechannel15b.php on line 361 Constant C:    Warning: Undefined variable $constant in /var/www/html/ponce/onlinechannel15b.php on line 362 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15b.php on line 362 Wetted perimeter P:    Warning: Undefined variable $wettedperimeter in /var/www/html/ponce/onlinechannel15b.php on line 363 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15b.php on line 363 Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinechannel15b.php on line 363 Top width T:    Warning: Undefined variable $topwidth in /var/www/html/ponce/onlinechannel15b.php on line 364 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15b.php on line 364 Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinechannel15b.php on line 364 Flow area A:    Warning: Undefined variable $flowarea in /var/www/html/ponce/onlinechannel15b.php on line 365 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15b.php on line 365 Warning: Undefined variable $areaunits in /var/www/html/ponce/onlinechannel15b.php on line 365 Hydraulic radius R:    Warning: Undefined variable $hydraulicradius in /var/www/html/ponce/onlinechannel15b.php on line 366 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15b.php on line 366 Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinechannel15b.php on line 366 Hydraulic depth D:    Warning: Undefined variable $hydraulicdepth in /var/www/html/ponce/onlinechannel15b.php on line 367 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15b.php on line 367 Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinechannel15b.php on line 367 OUTPUT: Stream or river (optional):   Discharge Q:    Warning: Undefined variable $discharge in /var/www/html/ponce/onlinechannel15b.php on line 379 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15b.php on line 379 Warning: Undefined variable $dischargeunits in /var/www/html/ponce/onlinechannel15b.php on line 379 Flow velocity v:    Warning: Undefined variable $flowvelocity in /var/www/html/ponce/onlinechannel15b.php on line 381 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15b.php on line 381 Warning: Undefined variable $velocityunits in /var/www/html/ponce/onlinechannel15b.php on line 381 Froude number F:    Warning: Undefined variable $froudenumber in /var/www/html/ponce/onlinechannel15b.php on line 383 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15b.php on line 383 Exponent of the rating β:    Warning: Undefined variable $beta in /var/www/html/ponce/onlinechannel15b.php on line 385 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15b.php on line 385 Neutrally stable Froude number Fns:    Warning: Undefined variable $fnns in /var/www/html/ponce/onlinechannel15b.php on line 387 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15b.php on line 387 Vedernikov number V:    Warning: Undefined variable $veder in /var/www/html/ponce/onlinechannel15b.php on line 388 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15b.php on line 388 N y Q A 0 0 0 0 Discharge-area rating:   Q = α A β Coefficient:  α = Warning: Undefined variable $acoef in /var/www/html/ponce/onlinechannel15b.php on line 453 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15b.php on line 453 Exponent:  β = Warning: Undefined variable $beta in /var/www/html/ponce/onlinechannel15b.php on line 454 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15b.php on line 454 Neutrally stable Froude number:  Fns = Warning: Undefined variable $fnns in /var/www/html/ponce/onlinechannel15b.php on line 455 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15b.php on line 455   Your request was processed at  10:21:48 pm on April 3rd, 2025   [ 250403  22:21:48 ]. 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